Texas Instruments TPA3251 User manual

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TPA3251 Evaluation Module
User's Guide
SLAU751–November 2017
TPA3251 Evaluation Module
This user's guide describes the characteristics, operation, and use of the TPA3251 evaluation module
(EVM). A complete printed-circuit board (PCB) description, schematic diagram, and bill of materials are
also included.
Figure 1. TPA3251 Evaluation Module
Contents
1 Quick Start (BTL Mode)..................................................................................................... 3
2 Setup By Mode............................................................................................................... 5
3 Hardware Configuration ................................................................................................... 10
4 EVM Design Documents ................................................................................................. 14
List of Figures
1 TPA3251 Evaluation Module............................................................................................... 1
2 EVM Board (Top Side)...................................................................................................... 3
3 EVM Board (Bottom Side).................................................................................................. 3
4 AIB Input: THD+N vs Frequency .......................................................................................... 5
5 AIB Input: THD+N vs Power ............................................................................................... 5
6 Molex™ Input: THD+N vs Frequency .................................................................................... 5
7 Molex Input: THD+N vs Power ............................................................................................ 5
8 RCA Input: THD+N vs Frequency ........................................................................................ 5
9 RCA Input: THD+N vs Power ............................................................................................. 5

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10 AIB Input: THD+N vs Frequency .......................................................................................... 7
11 AIB Input: THD+N vs Power ............................................................................................... 7
12 Molex Input: THD+N vs Frequency ....................................................................................... 8
13 Molex Input: THD+N vs Power ............................................................................................ 8
14 RCA Input: THD+N vs Frequency ........................................................................................ 8
15 RCA Input: THD+N vs Power ............................................................................................. 8
16 AIB Input: THD+N vs Frequency .......................................................................................... 9
17 AIB Input: THD+N vs Power ............................................................................................... 9
18 Molex Input: THD+N vs Frequency ..................................................................................... 10
19 Molex Input: THD+N vs Power .......................................................................................... 10
20 RCA Input: THD+N vs Frequency ....................................................................................... 10
21 RCA Input THD+N vs Power ............................................................................................. 10
22 EVM Power Tree........................................................................................................... 13
23 BTL LC Frequency Response ........................................................................................... 13
24 SE LC Frequency Response ............................................................................................. 13
25 TPA3251 EVM Top Composite Assembly .............................................................................. 14
26 TPA3251 EVM Bottom Composite Assembly .......................................................................... 15
27 TPA3251EVM Board Dimensions........................................................................................ 16
28 TPA3251EVM Schematic 1............................................................................................... 17
29 TPA3251EVM Schematic 2............................................................................................... 18
30 TPA3251EVM Schematic 3............................................................................................... 18
List of Tables
1 Jumper Configurations (BTL Mode)....................................................................................... 4
2 Mode Selection Pins ........................................................................................................ 5
3 Jumper Configurations (2.1 BTL Mode) .................................................................................. 6
4 Jumper Configuration (PBTL Mode) ...................................................................................... 7
5 Jumper Configuration (SE Mode).......................................................................................... 9
6 Fault and Clip Overtemperature Status ................................................................................. 10
7 Frequency Adjust Master Mode Selection .............................................................................. 11
8 Overcurrent Protection Selection......................................................................................... 11
9 AIB Connector (J28) Pinout............................................................................................... 12
10 TPA3251EVM Bill of Materials ........................................................................................... 19
Trademarks
PurePath is a trademark of Texas Instruments.
CoilCraft is a trademark of Coilcraft, Incorporated.
Molex is a trademark of Molex, LLC.
All other trademarks are the property of their respective owners.

www.ti.com Quick Start (BTL Mode)
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1 Quick Start (BTL Mode)
This section describes the necessary hardware, connections, configuration, and steps to quick start the
EVM into bridge-tied load (BTL) mode with stereo audio playing out of two speakers.
1.1 Required Hardware
The EVM requires the following hardware:
• TPA3251EVM (AMPS030-001) power supply 18-V to 36-V DC, 15 A
• Two 2-Ωto 8-Ω, 100-W speakers or resistor loads
• Four speaker or banana cables
• RCA input cables
• Analog output audio source
1.2 Connections and Board Configuration
Figure 2 and Figure 3 show both sides of the EVM board.
Figure 2. EVM Board (Top Side) Figure 3. EVM Board (Bottom Side)
The steps for making the connections are as follows:
1. Set S1 to the RESET position.
2. Set the power supply to 36 V (18-V to 38-V range) and current to 10 A (5-A to 14-A range).
3. Connect the power supply to the TPA3251EVM positive terminal to PVDD (J1-RED) and negative
terminal to GND (J1-BLACK).
4. Connect the positive side of the left channel load to the TPA3251EVM OUTA (J9-RED) terminal.
5. Connect the negative side of the left channel load to the TPA3251EVM OUTB (J9-BLACK) terminal.
6. Connect the positive side of the right channel load to the TPA3251EVM OUTC (J2-RED) terminal.
7. Connect the negative side of the right channel load to the TPA3251EVM OUTD (J2-BLACK) terminal.
8. Be careful not to mix up PVDD, OUTA, and OUTC because the colors are the same (RED).
9. Input configuration:
a. Single-ended (SE) inputs: Set J4 and J19 to SE and set J26, J27, J34, and J35 to RCA.
a. Connect the RCA male jack to the female RCA jack input A/AB (J3-RED).
b. Connect the RCA male jack to the female RCA jack input C/CD (J18-WHITE) .
b. Differential inputs: Set J4 and J19 to DIFF and set J26, J27, J34, and J35 to RCA
a. Connect the positive RCA male jack to the female RCA jack input A/AB (J3-RED) and connect
the negative RCA male jack to the female RCA jack input B (J14-BLACK).

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b. Connect the positive RCA male jack to the female RCA jack input C/CD (J18-RED) and
connect the negative RCA male jack to the female RCA jack input D (J15-BLACK).
c. Analog-Input Board (AIB) input: Set J26, J27, J34, and J35 to AIB.
10. Power up the power supply after correctly making all the connections. The 3.3-V and 12-V LEDs
(GREEN) then illuminate.
11. Set S1 to the NORMAL position.
12. The CLIP_OTW (ORANGE) and FAULT (RED) LEDs must be off if the audio source is off.
Table 1 lists the jumper configurations in BTL mode.
Table 1. Jumper Configurations (BTL Mode)
Jumper Setting Configuration for BTL
J29 IN PVDD to 15-V BUCK
J32 IN 12-V LDO to 12-V TERM
J33 IN 3.3-V LDO to 3.3-V TERM
J36 IN 12-V LDO to GVDD
J16 3 to 4 MASTER MODE 600kHz
J22 IN OUTA CAP SHUNT
J23 IN OUTB CAP SHUNT
J24 IN OUTC CAP SHUNT
J25 IN OUTD CAP SHUNT
J5 2 to 3 M1-L
J6 2 to 3 M2-L
J7 OUT PBTL SELECT INC
J8 OUT PBTL SELECT IND
J4 1 to 2 INA/B SE INPUT
J19 1 to 2 INC/D SE INPUT
J26 1 to 2 INC-SEL RCA
J27 1 to 2 IND-SEL RCA
J34 1 to 2 INA-SEL RCA
J35 1 to 2 INB-SEL RCA
J21 OUT C_START

Frequency (Hz)
THD+N (%)
0.0001
0.001
0.01
0.1
1
10
20 200 2000 20000
D013
1 W
20 W
75 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100 200
0.001
0.01
0.1
1
10
D004
Frequency (Hz)
THD+N (%)
0.0001
0.001
0.01
0.1
1
10
20 200 2000 20000
D010D010
1 W
20 W
75 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100 200
0.001
0.01
0.1
1
10
D001
www.ti.com Setup By Mode
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2 Setup By Mode
The user can configure the TPA3251EVM for four different output operations. The 2.0 BTL configuration is
the default set up of the TPA3251EVM as described in Section 1.2. The remaining three configurations
are 2.1 BTL plus two SE outputs, 0.1 PBTL output, and 4.0 SE outputs.
Table 2. Mode Selection Pins
Mode Pins Input Mode Output Configuration Description
M2 M1
0 0 2N + 1 2 x BTL Stereo BTL output configuration
0 1 2N-1N + 1 1 x BTL + 2 × SE 2.1 BTL + SE mode
1 0 2N + 1 1 × PBTL Parallel BTL configuration; connect INPUT_C
2.1 BTL Mode (Two-Speaker Output)
This mode is the same as described in Section 1.
2.1.1 Performance Data (BTL Mode)
All measurements are taken at an audio frequency = 1 kHz, PVDD_X = 36 V, RL = 4 Ω, fS = 600 kHz,
ROC = 22 kΩ, Output filter: L = 7 μH, C = 0.68 µF, with AES17 + AUX-0025 measurement filters.
Figure 4. AIB Input: THD+N vs Frequency Figure 5. AIB Input: THD+N vs Power
Figure 6. Molex™ Input: THD+N vs Frequency Figure 7. Molex Input: THD+N vs Power

Frequency (Hz)
THD+N (%)
0.0001
0.001
0.01
0.1
1
10
20 200 2000 20000
D016
1 W
20 W
75 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100 200
0.001
0.01
0.1
1
10
D007
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Figure 8. RCA Input: THD+N vs Frequency Figure 9. RCA Input: THD+N vs Power
2.2 BTL MODE (Three-Speaker Output)
OUTC and OUTD are the SE output channels and OUTA and OUTB are the BTL channels for 2.1
operations. OUTC and OUTD can only be in DIFF input mode.
1. Set J6 to L and J5 to H.
2. Remove jumpers J24 and J25.
3. Connect the positive side of the left channel load to OUTC (J2- RED) terminal and the negative side of
the left channel load to the GND (J20) terminal.
4. Connect the positive side of the right channel load to OUTD (J2-BLACK) terminal and the negative
side of the right channel load to the GND (J20) terminal.
5. Connect the positive terminal to OUTA (J9-RED) and the negative terminal to OUTB (J9-BLACK).
6. Set the J19 jumper position to DIFF.
7. Input configuration:
a. SE inputs: Connect the RCA male jack to the female RCA jack input A/AB (J3-RED) and set the J4
jumper positions to SE. Set J26, J27, J34, and J35 to RCA.
b. Differential inputs: Connect the positive RCA male jack to the female RCA jack input A/AB (J3-
RED) and connect the negative RCA male jack to the female RCA jack input B (J14-BLACK) and
set the J4 jumper positions to DIFF. Set J26, J27, J34, and J35 to RCA.
c. AIB inputs: Set J26, J27, J34, and J35 to AIB.
Table 3. Jumper Configurations (2.1 BTL Mode)
Jumper Setting Comment
J29 IN PVDD to 15-V BUCK
J32 IN 12-V LDO to 12-V TERM
J33 IN 3.3-V LDO to 3.3-V TERM
J36 IN 12-V LDO to GVDD
J16 3 to 4 MASTER MODE 600kHz
J22 IN OUTA CAP SHUNT
J23 IN OUTB CAP SHUNT
J24 OUT OUTC CAP SHUNT
J25 OUT OUTD CAP SHUNT
J5 1 to 2 M1 – H
J6 2 to 3 M2 – L
J7 OUT PBTL SELECT INC
2.3 PBTL Mode (One-Speaker Output)
This mode uses all four half bridges for a mono output, allowing for the maximum power output from the
device across one load.

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2.3.1 Connections and Board Configuration
1. Set J6 to H and J5 to L.
2. Connect the positive side of the load to OUTA (J9-RED) and OUTC (J2-RED) terminals (OUTA and
OUTC shorted).
3. Connect the negative side of the load to OUTB (J9-BLACK) and OUTD (J2-BLACK) terminals (OUTB
and OUTD shorted).
4. Install PBTL jumpers J7 and J8 (pulls input C and input D to GND).
5. Input configuration:
a. SE inputs: Connect the RCA male jack to the female RCA jack input A/AB (J3-RED) and set the J4
jumper positions to SE. Set J26, J27, J34, and J35 to RCA.
b. Differential inputs: Connect the positive RCA male jack to the female RCA jack input A/AB (J3-
RED) and connect the negative RCA male jack to the female RCA jack input B (J14-BLACK). Set
the J4 jumper position to DIFF, and set J26, J27, J34, and J35 to RCA.
c. AIB input: Set J26, J27, J34, and J35 to AIB.
(1) INA and INB are the inputs for PBTL, and INC and IND are grounded
for PBTL operation.
Table 4. Jumper Configuration (PBTL Mode)
Jumper Setting Comment(1)
J29 IN PVDD to 15-V BUCK
J32 IN 12-V LDO to 12-V TERM
J33 IN 3.3-V LDO to 3.3-V TERM
J36 IN 12-V LDO to GVDD
J16 3 to 4 MASTER MODE 600kHz
J22 IN OUTA CAP SHUNT
J23 IN OUTB CAP SHUNT
J24 IN OUTC CAP SHUNT
J25 IN OUTD CAP SHUNT
J5 2 to 3 M1 – L
J6 1 to 2 M2 – H
J7 IN PBTL SELECT INC – GND
J8 IN PBTL SELECT IND – GND
J4 1 to 2 INA/B SE INPUT
J19 1 to 2 INC/D SE INPUT
J26 1 to 2 INC-SEL RCA
J27 1 to 2 IND-SEL RCA
J34 1 to 2 INA-SEL RCA
J35 1 to 2 INB-SEL RCA
J21 OUT C_START
2.3.2 Performance Data (PBTL Mode)
All measurements are taken at an audio frequency = 1 kHz, PVDD_X = 36 V, RL = 4 Ω, fS = 600 kHz,
ROC = 22 kΩ, Output filter: L = 7μH, C = 0.68 µF, with AES17 + AUX-0025 measurement filters.

Frequency (Hz)
THD+N (%)
0.0001
0.001
0.01
0.1
1
10
20 200 2000 20000
D017
1 W
50 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100 200
0.001
0.01
0.1
1
10
D008
Frequency (%)
THD+N (%)
0.0001
0.001
0.01
0.1
1
10
20 200 2000 20000
D014
1 W
50 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100 200
0.001
0.01
0.1
1
10
D005
Frequency (Hz)
THD+N (%)
0.0001
0.001
0.01
0.1
1
10
20 200 2000 20000
D011
1 W
50 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100 200
0.001
0.01
0.1
1
10
D002D002
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Figure 10. AIB Input: THD+N vs Frequency Figure 11. AIB Input: THD+N vs Power
Figure 12. Molex Input: THD+N vs Frequency Figure 13. Molex Input: THD+N vs Power
Figure 14. RCA Input: THD+N vs Frequency Figure 15. RCA Input: THD+N vs Power
2.4 SE Mode (Four-Speaker Output)
1. Set J6 to H and J5 to H.
2. Remove jumpers J22, J23, J24, and J25.
3. Connect the positive side of the load to the OUTA (J9-RED) terminal and the negative side of the load
to the GND (J11) terminal.
4. Connect the positive side of the load to the OUTB (J9-BLACK) terminal and the negative side of the
load to the GND (J11) terminal.
5. Connect the positive side of the load to the OUTC (J2-RED) terminal and the negative side of the load
to the GND (J20) terminal.
6. Connect the positive side of the load to the OUTD (J2-BLACK) terminal and the negative side of the
load to the GND (J20) terminal.
7. Set both J4 and J19 jumpers position to DIFF.
8. Input configuration:
a. Differential inputs: Set J26, J27, J34, and J35 to RCA.
i. Connect the male RCA jack to the female RCA jack input A/AB (J3-RED) for the OUTA
speaker.

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ii. Connect the male RCA jack to the female RCA jack input B (J14-BLACK) for the OUTB
speaker.
iii. Connect the male RCA jack to the female RCA jack input C/CD (J18-WHITE) for the OUTC
speaker.
iv. Connect the male RCA jack to the female RCA jack input D (J15-BLUE) for the OUTD
speaker.
b. AIB input: Set J26, J27, J34, and J35 to AIB.
Table 5. Jumper Configuration (SE Mode)
Jumper Setting Comment
J29 IN PVDD to 15-V BUCK
J32 IN 12-V LDO to 12-V TERM
J33 IN 3.3-V LDO to 3.3-V TERM
J36 IN 12-V LDO to GVDD
J16 3 to 4 MASTER MODE 600kHz
J22 OUT OUTA CAP SHUNT
J23 OUT OUTB CAP SHUNT
J24 OUT OUTC CAP SHUNT
J25 OUT OUTD CAP SHUNT
J5 1 to 2 M1 – H
J6 1 to 2 M2 – H
J7 OUT PBTL SELECT INC
J8 OUT PBTL SELECT IND
J4 2 to 3 INA/B DIFF INPUT
J19 2 to 3 INC/D DIFF INPUT
J26 1 to 2 INC-SEL RCA
J27 1 to 2 IND-SEL RCA
J34 1 to 2 INA-SEL RCA
J35 1 to 2 INB-SEL RCA
J21 IN C_START
NOTE: The performance of the TPA3251EVM/TPA3251D2DDV is dependent on the power supply.
Design the power supply with margins that can deliver the required power. Some low-
frequency applications can require additional bulk capacitance. Replacing the bulk capacitors
on the TPA3251EVM with 3300 µF or more capacitance can be necessary depending on the
power supply used.
2.4.1 Performance Data (SE Mode)
All measurements are taken at audio frequency = 1 kHz, PVDD_X = 36 V, RL = 4 Ω, fS = 600 kHz, ROC
= 22 kΩ, Output filter: L = 7 μH, C = 0.68 µF, with AES17 + AUX-0025 measurement filters.

Frequency (Hz)
THD+N (%)
0.001
0.01
0.1
1
10
50
20 200 2000 20000
D018
1 W
10 W
30 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100
0.001
0.01
0.1
1
10
D009
Frequency (Hz)
THD+N (%)
0.001
0.01
0.1
1
10
50
20 200 2000 20000
D015
1 W
10 W
30 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100
0.001
0.01
0.1
1
10
D006D006
Frequency (Hz)
THD+N (%)
0.001
0.01
0.1
1
10
50
20 200 2000 20000
D012
1 W
10 W
30 W
Power (W)
THD+N (%)
0.01 0.1 1 10 100
0.001
0.01
0.1
1
10
D003
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Figure 16. AIB Input: THD+N vs Frequency Figure 17. AIB Input: THD+N vs Power
Figure 18. Molex Input: THD+N vs Frequency Figure 19. Molex Input: THD+N vs Power
Figure 20. RCA Input: THD+N vs Frequency Figure 21. RCA Input THD+N vs Power
3 Hardware Configuration
3.1 Indicator Overview (OTW_CLIP and FAULT)
The TPA3251EVM is equipped with LED indicators that illuminate when the FAULT or CLIP_OTW pin (or
both) goes low. See Table 6 and TPA3251 175-W Stereo, 350-W Mono PurePath™ Ultra-HD Analog-
Input Class-D Amplifier for more details on which events trigger the pins to go low.
Table 6. Fault and Clip Overtemperature Status
FAULT OTW_CLIP Description
0 0 Overtemperature (OTE), overload (OLP), or undervoltage (UVP) junction temperature higher than
125°C (overtemperature warning)
0 0 OLP or UVP; junction temperature higher than 125°C (overtemperature warning)
0 1 OLP or UVP; junction temperature lower than 125°C
1 0 Junction temperature higher than 125°C (overtemperature warning)
1 1 Junction temperature lower than 125°C and no OLP or UVP faults (normal operation)

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3.2 PWM Frequency Adjust
The TPA3251EVM offers a hardware-trimmed oscillator frequency by through the external control of the
FREQ_ADJ pin. Use the frequency adjust to reduce interference problems while using a radio receiver
tuned within the AM band and change the switching frequency from nominal values to lower values (see
Table 7). Choose these values such that the nominal- and the lower-value switching frequencies together
result in the fewest cases of interference throughout the AM band. Select the oscillator frequency based
on the value of the FREQ_ADJ resistor connected to GND in master mode.
Table 7. Frequency Adjust Master Mode Selection
Mode Switching Frequency Resistor to GND Pin Configuration
MASTER MODE 600 kHz 600 kHz 10 kΩ3 to 4
MASTER MODE 500 kHz 500 kHz 20 kΩ5 to 6
MASTER MODE 450 kHz 450 kHz 30 kΩ7 to 8
For slave-mode operation, turn off the oscillator by pulling the FREQ_ADJ pin to 3.3 V. This action
configures the OSC_I/O pins as inputs, which are to be slaved from an external differential clock. In a
master and slave system, interchannel delay is automatically set up between the switching phases of the
audio channels, which can be illustrated by no idle channels switching at the same time. This setup does
not influence the audio output; rather, only the switch timing to minimize noise coupling between audio
channels through the power supply. In turn, this process optimizes audio performance and results in better
operating conditions for the power supply. The interchannel delay is setup for a slave device depending on
the polarity of the OSC_I/O connection, such that slave mode 1 is selected by connecting OSC_I/O of the
master device in phase with OSC_I/O of the slave device (+ to + and – to –), while slave mode 2 is
selected by connecting the OSC_I/Os out of phase (+ to – and – to +).
3.3 TPA3251EVM Overcurrent Adjust
The TPA3251EVM offers the ability for the user to change the current limit by changing R13 as well as
having two different protection modes, Cycle by Cycle Current Control (CB3C) and Latching Shutdown
(Latched OC). For CB3C operations, the resistance must be a value of 22 kΩto 30 kΩ. For Latched OC
operations, the resistance must be a value of 47 kΩto 64 kΩ. By default, the resistor R13 is 22 kΩ.
Table 8 shows a few resistance values and their corresponding OC threshold and OC protection mode.
Table 8. Overcurrent Protection Selection
OC_ADJ Resistor
Value Protection Mode OC Threshold
22 kΩCB3C 16.3 A
24 kΩCB3C 15.1 A
27 kΩCB3C 13.5 A
30 kΩCB3C 12.3 A
47 kΩLatched OC 16.3 A
51 kΩLatched OC 15.1 A
56 kΩLatched OC 13.5 A
64 kΩLatched OC 12.3 A
3.4 TPA3251EVM Single-Ended and Differential Inputs
The TPA3251EVM supports both differential and SE inputs. For SE inputs, set either the J4 or J19 jumper
(or both) to the SE position so that the TPA3251EVM uses the NE5532 operational amplifier (op amp) to
convert the SE input signal to differential to properly drive the differential inputs of the TPA3251 device.
Use input RCA jack J3 to provide INA and INB inputs. Use RCA jack J18 to provide INC and IND inputs
with SE inputs. For differential input operation, set either the J4 or J19 jumpers (or both) to the DIFF
position. The TPA3251EVM uses the NE5532 to buffer the differential input signal to the differential inputs
of the TPA3251 device. Use input RCA jack J3 to provide INA, RCA jack J14 to provide INB, RCA jack
J18 to provide INC, and RCA jack J15 to provide IND with differential inputs.

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NOTE: The SE input settings on the TPA3251EVM must only be used for channels with output
configuration BTL or PBTL, not SE. For SE output configuration, the user must set either
jumper J4 or J19 (or both) for that channel to the DIFF position so that the input signal INx is
mapped directly to OUTx.
3.5 Input Connectors
The TPA3251EVM supports three different input connectors. J3, J14, J15, and J18 are RCA connectors;
J10 and J12 are Molex connectors; and J28 is the AIB connector with J30 being the AIB alignment
connection. Table 9 shows the AIB pinout in detail.
Table 9. AIB Connector (J28) Pinout
Pin
No. Function Description Audio EVM Input or Output
1 Amp Out A Speaker-level output from audio class-D EVM (SE or one side of BTL) O
2 Amp Out B Speaker-level output from audio class-D EVM (SE or one side of BTL) O
3 PVDD PVDD voltage supply from audio Class-D EVM (variable voltage depending
on Class-D EVM use) O
4 GND Ground reference between audio plug-in module and audio class-D EVM
5 NC
6 NC
7 3.3 V 3.3-V supply from EVM; used for powering audio plug-in module O
8 3.3 V 3.3-V supply from EVM; used for powering audio plug-in module O
9 12 V 12-V supply from EVM; used for powering audio plug-in module O
10 EN and Reset Assert enable and reset control for audio class-D EVM (active low) I
11 Analog IN_A Analog audio input A (analog in EVM), Master I2S bus (digital in EVM) I
12 NC
13 Analog IN_B Analog audio input B (analog in EVM), bit clock I2S bus (digital in EVM) I
14 CLIP_OTW Clipping detection, overtemperature warning, or both from audio class-D EVM
(active low) O
15 Analog IN_C Analog audio input C (analog in EVM), frame clock I2S bus (digital in EVM) I
16 FAULT Fault detection from audio Class-D EVM (active low) O
17 Analog IN_D Analog audio Input D (analog in EVM), data in I2S bus (digital in EVM) I
18 NC
19 NC
20 NC
21 GND Ground reference between audio plug-in module and audio class-D EVM
22 GND Ground reference between audio plug-in module and audio class-D EVM
23 NC
24 NC
25 NC
26 NC
27 Amp Out C Speaker-level output from audio class-D EVM (SE or one side of BTL) O
28 Amp Out D Speaker-level output from audio class-D EVM (SE or one side of BTL) O

cut off 1 1
F 72.9 kHz
2 L C 2 7 H .68 F

S u S P u P
PVDD J29 LM5010ASD LM2940IMP-12J31 J32 TLV117-33IDCY
J36 GVDD
J33 3.3 V
15 V 12 V
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3.6 EVM Power Tree
The EVM power section is self-contained with all the necessary onboard voltages generated from the
main PVDD (J1) power input. The PVDD is reduced to 15 V and then used to generate the remaining
required board voltages of 12 V, 5 V, and 3.3 V. Low-dropout linear regulators (LDOs) generate supplies
going to the TPA3221 device itself to reduce the chance of extra added noise. LEDs are provided on the
5-V and 3.3-V supplies so that the user can verify that the EVM is powered (see Figure 22).
Figure 22. EVM Power Tree
3.7 LC Filter Overview
Included near the output of the TPA3251 device are four output LC filters. These output filters filter the
pulse-width modulation (PWM) output, leaving only the audio content at high power, which is fed to the
speakers. The board uses a CoilCraft™ 7-µH inductor and a 0.68-µF film capacitor to form this LC filter.
Using the equations listed in LC Filter Design Application Report , the low-pass filter cutoff is calculated as
follows in Equation 1:
(1)
Figure 23. BTL LC Frequency Response Figure 24. SE LC Frequency Response
3.8 Post-Filter Feedback (PFFB)
The TPA3251EVM has the footprints available to implement post filter feedback to improve the audio
performance of the TPA3251 amplifier. For more details on benefits and implementation, see TPA324x
and TPA325x Post-Filter Feedback .

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3.9 Reset Circuit
The TPA3251EVM includes RESET supervision so that the TPA3251 device remains in reset until all the
power rails are up and stable. The RESET supervisor also ensures that the device is put into reset if one
of the power rails experiences a brownout. This circuit combined with the RESET switch (S1) help ensure
that the TPA3251 can be placed in reset easily as needed or automatically if there is a power supply
issue.
3.10 Op Amp versus Direct Drive
The op amps are used to change a single-ended input into a differential input. By default, the gain of the
op amps are set for unity gain; however, this can be modified to increase or decrease the gain through the
op amps. One way to bypass the op amps for a more direct connection is using the AIB.
4 EVM Design Documents
This section contains the TPA3251EVM board layout, schematics, and bill of materials (BOM).
4.1 TPA3251EVM Board Layouts
Figure 25 and Figure 26 illustrate the EVM board layouts.
Figure 25. TPA3251 EVM Top Composite Assembly

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Figure 26. TPA3251 EVM Bottom Composite Assembly

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4.2 TPA3251EVM Board Layouts
Figure 27 shows the EVM board dimensions.
Figure 27. TPA3251EVM Board Dimensions

1
2
3
48
U6A
NE5532ADR
5
6
7
48
U6B
NE5532ADR
10.0k
R27
10.0k
R20
10.0k
R21
GND
10.0k
R25
22pF
C65
22pF
C57
VMID
1
2
3
J19
IN C/D
SE
DIFF
1
2
3
48
U5A
NE5532ADR
5
6
7
48
U5B
NE5532ADR
10.0k
R42
10.0k
R7
10.0k
R8
GND
10.0k
R41
22pF
C23
22pF
C18
1
2
3
J4
IN A/B
SE
DIFF
100k
R48
10µF
C20
10µF
C71
10µF
C62
10µF
C66
1
2
3
J10
INPUT SE A
SE AB
DIFF A+
INPUT SE B
DIFF A-
INPUT SE D
DIFF C-
GND
INA
INB
OUTA
OUTB
+12V-OA
+12V-OA
INC
IND
OUTC
OUTD
RCA INPUT
LEFT+
RCA INPUT
LEFT-
RCA INPUT
RIGHT-
To DUT
To DUT
From DUT
INB-RCA
IND-RCA
1
2
3
J12
INA-RCA
INB-AIB
INA-AIB
100k
R43
100k
R9
100k
R45
INPUT SE C
SE CD
DIFF C+
RCA INPUT
RIGHT+
INC-RCA
GND
PBTL
SELECT
AUDIO
BOARD
INC-AIB
IND-AIB
INB-AIB
INA-AIB
FROM DUT CLIP_OTW
FAULT
J30
GND
ALIGNMENT
HEADER
AIB
RESET-SW
RESET 1.00k
R53
INTERFACE
22pFC73
DNP
DNP
18.0k
R47
DNP
DNP
22pF
C74
DNP
DNP
18.0k
R49
DNP
DNP
22pFC75
DNP
DNP
22pF
C76
DNP
DNP
To DUT
To DUT
From DUT
0R64 DNP
DNP
0
R63 DNP
DNP
0R66 DNP
DNP
0
R65 DNP
DNP
SPKA-OUT
SPKB-OUT
SPKC-OUT
SPKD-OUT
SPKA-OUT
SPKC-OUT
RST-AIB
0
R67
DNP
DNP
3.3V
GND GND
3.3V
+12V
PVDD
10µF
C17
10µF
C28
10µF
C55
10µF
C63
1 2 3
J34 INA-SEL
IN-A_RCA
1 2 3
J35 INB-SEL
IN-B_RCA
IN-C_RCA
IN-D_RCA
INB-SEL
GROUND
ROUTED
<-
VMID
VMID
VMID
SPKD-OUT
SPKB-OUT
IND-AIB
INC-AIB
1 2 3
J26 INC-SEL
1 2 3
J27 IND-SEL
0
R4
0R12
0R36
0R44
INA-SEL
10.0k
R46
GND
1
2
J7
INC
1
2
J8
IND
GND
AGND1
NT1
Net-Tie
NT2
Net-Tie
AGND2
AGND1
AGND1
AGND2
AGND2
AGND2
AGND1
2.00kR11
DNP
DNP
GND
220pF
C26
DNP
DNP
2.00kR14
DNP
DNP
GND 220pF
C37
DNP
DNP
2.00kR18
DNP
DNP
GND
220pF
C45
DNP
DNP
2.00kR22
DNP
DNP
GND 220pF
C61
DNP
DNP
18.0k
R50
DNP
DNP
18.0k
R51
DNP
DNP
1
3
56
4
2
7
910
8
12 11
14 13
16 15
18 17
20 19
22 21
24 23
26 25
28 27
J28
0
R52
0R59
0R60
0
R62
INC-SEL
IND-SEL
1
2
3
J3
INA/AB
1
2
3
J14
INB
1
2
3
J18
INC/CD
1
2
3
J15
IND
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4.3 TPA3251 EVM Schematics
Figure 28 through Figure 30 illustrate the TPA3251EVM schematics.
Figure 28. TPA3251EVM Schematic 1

IN
1OUT 3
GND 2 TAB
4
U2
LM2940IMP-12/NOPB
GND
1A
D1
0.047µF
C1
0.1uF
C13
GND
4700pF
C12
182k
R2
5600pF
C7
0.47µF
C8
0.1uF
C9
GND GND
GND
GND
GND
+12V
47µF
C5
10µF
C38
GND
GND GND
100µF
C10
4.99k
R39
1.00k
R40
GND
GND
3A
D3
GND
GND
VCC 9
SS
7
SW 1
FB 6 RTN
5
VIN
10
BST 2
RON/SD
8
DAP 11
ISEN 3
SGND
4
U1
LM5010ASD/NOPB
PVDD
0.1µF
50V
C2
GND GND
2.2µF
50V
C4
PVDD
GND
1µF
50V
C3
0.01µF
50V
C11
RANGE 18V-36V
47µF
50V
C39
+15V
+12V
360
R34
GND
Green
D5
3.3V
3.3V
3.3V
Hi Current Shunt
+15V
J29
PVDD-IN
J32
12V
J33
3.3V
1.50k
R58
GND
Green
D6
12V
+12V
15V-VR
4.7µF
C6
100µH 1.5A
L1
OUTPUT 2
GND 1
IN
3
OUTPUT 4
U3
TLV1117-33IDCY
10.0k
R38
VMID
0.1uF
C51
GND GND
10µF
C53
10µF
C70
0.1uF
C72
+12V-OA
0.1uF
C15
GND GND
10µF
C16
+12V
GND
10µF
C81
10uH 0.8A
L6
10.0k
R37
+12V-OA
10µF
C89
0.1uF
C90
10µF
C91
12V-VR
3.3V-VR
GND GNDGND GND
NT3
Net-Tie
GND
J1
J31
RESET
Q2
+12V
GND
Orange
D2
OTW
+12V
GND GND
CLIP_OTW
MONITORS
100
R33
100
R35
FAULT
7uH 6.5A
L2
MA5173
0.68µF
C24
GND
1000pF
C25
DNP
DNP
GND
0.68µF
C35
GND GND
0.68µF
C43
GND GND
0.68µF
C59
GND GND
GND
PVDD
GND
GND
PVDD
OUT_A
OUT_B
OUT_C
0.033µF
C27
GND
1µF
C32
GND
GNDGND
0.033µF
C29
0.033µF
C52
0.033µF
C54
RESET
VBG
1
2
J21
GND
0.01µF
C49
GND GND
1µFC40
0.1uF
C14
GND
0
R3 GVDD_AB
0.1uF
C22
3.3
R6
GND
1
2
3
J6
3.3V
1
2
3
J5
3.3V
M1
M2
GND
GND
M1
M2
INPUT_A
INPUT_B
INPUT_A
INPUT_B
INPUT_C
INPUT_D
GND
3.3V
SLAVE MODE
10.0kR15
20.0k
R16
30.0k
R17
MASTER MODE
MASTER MODE AM1
MASTER MODE AM2
GND
FREQUENCY
22.0k
R13
ADJUST
OUT_D
C_START
INPUT_D
INPUT_C
47k
R24 1.00k
R29
1.00k
R31
0.1µF
C68
GND
100pF
C64
100
R23
GND
100pF
C58
100
R19
GND
100pF
C30
100
R10
GND
100pF
C19
100
R5
GND
MODE PIN SELECTION
M2 M1
0
1
0
1
0
1
0
1
INPUT MODE OUTPUT DESCRIPTION
2N + 1
2N/1N + 1
2N + 1
1N + 1
2xBTL
1xBTL + 2xSE
1xPBTL
4xSE
STEREO BTL OUTPU T, A D MODE
2.1 BTL + SE MODE, AD MODE
PARALLEL BTL O UTPUT, A D MODE
SINGLE ENDED OUTPUT, A D MODE
3.3V
IN = SE
OUT = BTL
1µF
C33
1µF
C47
1µF
C48
1000pF
C36
DNP
DNP
1000pF
C44
DNP
DNP
1000pF
C60
DNP
DNP
HEATSINK
GND Black
J20
GNDCD
OUT_A
OUT_B
OUT_C
OUT_D
OUTA
OUTB
OUTC
OUTD
Black
J11
GNDAB
12
34
56
78
J16
OA
OB
OC
OD
GND
1µFC77
DNP
DNP 3.30R54
DNP
DNP
GND
1µFC78
DNP
DNP
1µFC79
DNP
DNP
1µF
C80
DNP
DNP
TP13
RESET
TP14 FAULT
TP1 CLIP_OTW
TP6
GND
TP2
PWMA
TP7
PWMC
TP5
PWMB
TP9
PWMD
TP4 PVDD-AB
TP8 PVDD-CD TP3
OUTA
TP10
OUTB
TP11
OUTC
TP12
OUTD
Hi Current Shun t
GND
GND
6
4
5
13
S1
RESET
GND
0.1uF
C67
GND
0.1uF
C82
J13
DNP
DNP
FAULT
0
R30
3.30k
R26
GND
GND
7uH 6.5A
L3
MA5173
7uH 6.5A
L4
MA5173
7uH 6.5A
L5
MA5173
PVDD
100k
R61
0.1uF
C69
GND
GVDD_CD
0
R1
1µF
C83
1µF
C84
GND
VDD
GVDD_AB
VDD
GVDD_CD
3.3V
FAULT
CLIP_OTW
GND
OSCILLATOR
SYNC
INTERFACE
4
1
2
3
J17
0.47µF
C50
47k
R28
MODE
SELECTION
GND 1
GND 2 MR
5
RESET 3 VDD
4
U7
TPS3802K33D CKR
GND
1500µF
C21
1500µF
C34
1500µF
C42
1500µF
C56
2200µF
C31
2200µF
C46
Hi Current Shun t
Hi Current Shun t
Hi Current Shun t
3.30R55
DNP
DNP
3.30R56
DNP
DNP
3.30
R57
DNP
DNP
Q1
1µF
C41
TP26
FREQ_ADJ
DNP
TP25
M1
DNP
TP24
OC-ADJ
DNP
TP20
INA
DNP
TP21
INB
DNP
TP22
INC
DNP
TP23
IND
DNP
TP18
DVDD
DNP
TP19
AVDD
DNP
TP15
GVDD-AB
DNP
TP16
VDD
DNP
TP17
GVDD-CD
DNP
TP27
VBG
DNP
INA
INB
INC
IND
FROM
ANALOG
FRONT END
OUTA
TO
ANALOG
FRONT END
OUTB
OUTC
OUTD
CLIP_OTW
FAULT
RESET-SW
TO
AIB
CONNECTOR
RESET-SW
OC_IOP
OC_IOM
VDD-RST
AVDD
14
BST_A 44
BST_B 43
BST_C 24
BST_D 23
VBG 20
C_START
15
DVDD
11
FAULT 19
FREQ_ADJ
8
GND 12
GND 13
GND 25
GND 26
GND 33
GND 34
GND 41
GND 42
GVDD_AB
1
GVDD_CD
22
INPUT_A
5
INPUT_B
6
INPUT_C
16
INPUT_D
17
M1
3
M2
4
OC_ADJ
7
OC_IOM
9OC_IOP
10
CLIP OTW 21
OUT_A 39
OUT_A 40
OUT_B 35
OUT_C 32
OUT_D 27
OUT_D 28
PVDD_AB
36 PVDD_AB
37 PVDD_AB
38
PVDD_CD
29 PVDD_CD
30 PVDD_CD
31
RESET
18
VDD
2
U4
TPA3251D2DD VR
Red
D4
FAULT
GND
1µF
C85
DNP
DNP
1µF
C86
DNP
DNP
J36
+12V
+12V GVDD GVDD
GVDD
GVDD
GVDD
J9
J2
J22
J23
J24
J25
8.87k
R32
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Figure 29. TPA3251EVM Schematic 2
Figure 30. TPA3251EVM Schematic 3

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4.4 TPA3251EVM Bill of Materials
Table 10 lists the TPA3251EVM BOM.
Table 10. TPA3251EVM Bill of Materials
Designator Quantity Value Description Package Reference Part Number Manufacturer
!PCB1 1 Printed Circuit Board AMPS030 Any
C1 1 0.047uF CAP, CERM, 0.047 µF, 25 V, +/- 10%,
X7R, 0402 0402 GRM155R71E473KA88 DMuRata
C2, C9, C13, C15, C51,
C68, C72, C90 8 0.1uF CAP, CERM, 0.1 µF, 50 V, +/- 10%, X7R, 0603 0603 C0603C104K5RACTU Kemet
C3 1 1uF CAP, CERM, 1 µF, 50 V, +/- 10%, X7R,
0603 0603 UMK107AB7105KA-T Taiyo Yuden
C4 1 2.2uF CAP, CERM, 2.2 µF, 50 V, +/- 10%,
X7R, 0805 0805 C2012X7R1H225K125A CTDK
C5 1 47uF CAP, AL, 47 µF, 16 V, +/- 20%, 0.36
ohm, SMD SMT Radial D EEE-FK1C470P Panasonic
C6 1 4.7uF CAP, CERM, 4.7 µF, 25 V, +/- 10%,
X7R, 1206 1206 GRM31CR71E475KA88 LMuRata
C7 1 5600pF CAP, CERM, 5600 pF, 50 V, +/- 10%,
X7R, 0603 0603 GRM188R71H562KA01 DMuRata
C8, C50 2 0.47uF CAP, CERM, 0.47 µF, 25 V, +/- 10%,
X7R, 0603 0603 GRM188R71E474KA12 DMuRata
C10 1 100uF CAP, AL, 100 µF, 6.3 V, +/- 20%, 0.7
ohm, SMD SMT Radial C EEE-FK0J101UR Panasonic
C11 1 0.01uF CAP, CERM, 0.01 µF, 50 V, +/- 10%,
X7R, 0603 0603 C0603C103K5RACTU Kemet
C12 1 4700pF CAP, CERM, 4700 pF, 50 V, +/- 10%,
X7R, 0603 0603 C0603X472K5RACTU Kemet
C14, C22, C67, C69,
C82 5 0.1uF CAP, CERM, 0.1uF, 50V, +/-10%, X7R, 0603 0603 C0603C104K5RACTU Kemet
C16, C53, C70, C81,
C89, C91 6 10uF CAP, CERM, 10 µF, 16 V, +/- 10%, X5R, 0805 0805 EMK212BJ106KG-T Taiyo Yuden
C17, C28, C55, C63 4 10uF CAP, CERM, 10 µF, 16 V, +/- 10%,
X7R, 1206 1206 GRM31CR71C106KAC 7L MuRata
C18, C23, C57, C65 4 22pF CAP, CERM, 22 pF, 50 V, +/- 5%,
C0G/NP0, 0603 0603 GRM1885C1H220JA01 DMuRata
C19, C30, C58, C64 4 100pF CAP, CERM, 100 pF, 50 V, +/- 5%,
C0G/NP0, 0603 0603 GRM1885C1H101JA01 DMuRata
C20, C38, C62, C66,
C71 5 10uF CAP, AL, 10 µF, 16 V, +/- 20%, 1.35 ohm, SMD SMT Radial B EEE-FK1C100R Panasonic
C21, C34, C42, C56 4 1500uF CAP, AL, 1500 µF, 63 V, +/- 20%, 0.03
ohm, AEC-Q200 Grade 2, TH Dia 18mm EEU-FC1J152 Panasonic
C24, C35, C43, C59 4 0.68uF CAP, Film, 0.68 µF, 250 V, +/- 5%, TH 18x9x17.5mm B32652A3684J EPCOS Inc
C27, C29, C52, C54 4 0.033uF CAP, CERM, 0.033 µF, 50 V, +/- 10%,
X7R, 0603 0603 GRM188R71H333KA61 DMuRata
C31, C46 2 2200uF CAP, AL, 2200 µF, 50 V, +/- 20%,
0.023 ohm, TH Dia 18mm EEU-FC1H222 Panasonic
C32, C33, C47, C48,
C83, C84 6 1uF CAP, CERM, 1 µF, 50 V, +/- 10%, X7R, 1206 1206 GRM31MR71H105KA88 LMuRata
C39 1 47uF CAP, AL, 47 µF, 50 V, +/- 20%, 0.68
ohm, SMD SMT Radial E EEE-FK1H470P Panasonic
C40, C41 2 1uF CAP, CERM, 1 µF, 16 V, +/- 10%, X7R,
0603 0603 GRM188R71C105KA12 DMuRata
C49 1 0.01uF CAP, CERM, 0.01 µF, 50 V, +/- 10%,
X7R, 0603 0603 GRM188R71H103KA01 DMuRata
D1 1 100V Diode, Schottky, 100 V, 1 A, SMA SMA B1100-13-F Diodes Inc.
D2 1 Orange LED, Orange, SMD LED_0805 LTST-C170KFKT Lite-On
D3 1 100V Diode, Schottky, 100 V, 3 A, SMA SMA SK310A-TP Micro Commercial
Components
D4 1 Red LED, Red, SMD Red 0805 LED LTST-C170KRKT Lite-On
D5, D6 2 Green LED, Green, SMD LED_0805 LTST-C171GKT Lite-On
H1, H2, H3, H4, H5 5 MACHINE SCREW PAN PHILLIPS 4-
40 Machine Screw, 4-40, 1/4 inch PMSSS 440 0025 PH B&F Fastener Supply
H6, H7 2 MACHINE SCREW PAN PHILLIPS M3 M3 Screw RM3X8MM 2701 APM HEXSEAL
H8, H9, H10, H11, H12 5 HEX STANDOFF 4-40 ALUMINUM 3/4" HEX STANDOFF 4-40
ALUMINUM 3/4" 2204 Keystone
HEATSINK 1 Heat Sink, Vertical Heatsink ATS-TI1OP-519-C1-R3 Advanced Thermal
Solutions

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TPA3251 Evaluation Module
Table 10. TPA3251EVM Bill of Materials (continued)
Designator Quantity Value Description Package Reference Part Number Manufacturer
J1, J2, J9 3 Dual Binding Posts with Base, 2x1, TH Dual Binding Posts with
Base, 2x1, TH 6883 Pomona Electronics
J3 1 RCA Jack, Vertical, Red, TH RCA JACK, RED RCJ-022 CUI Inc.
J4, J19, J26, J27, J34,
J35 6 Header, 100mil, 3x1, Gold, TH PBC03SAAN PBC03SAAN Sullins Connector Solutions
J5, J6 2 1x3 Header, 100mil, 3x1, Gold, TH PBC03SAAN PBC03SAAN Sullins Connector
Solutions
J7, J8, J21, J29, J30,
J32, J33, J36 8 Header, 100mil, 2x1, Gold, TH Sullins 100mil, 1x2, 230 mil above insulator PBC02SAAN Sullins Connector Solutions
J10, J12 2 Header, 2.54 mm, 3x1, TH Header, 2.54mm, 3x1,
TH 22-11-2032 Molex
J11, J20 2 Binding Post, BLACK, TH 11.4x27.2mm 7007 Keystone
J14 1 RCA Jack, Vertical, Black, TH RCA Jack, Vertical,
Black, TH RCJ-021 CUI Inc.
J15 1 RCA Jack, Vertical, Blue, TH RCA Jack, Vertical,
Blue, TH RCJ-025 CUI Inc.
J16 1 Header, 100mil, 4x2, Tin, TH Header, 4x2, 100mil, Tin PEC04DAAN Sullins Connector
Solutions
J17 1 Header (friction lock), 100mil, 4x1,
Gold, TH Header 4x1 keyed 0022112042 Molex
J18 1 RCA Jack, Vertical, White, TH RCA JACK, WHITE RCJ-023 CUI Inc.
J22, J23, J24, J25, J31 5 JUMPER TIN SMD 6.85x0.97x2.51 mm S1911-46R Harwin
J28 1 Receptacle, 100mil, 14x2, Gold, TH 14x2 Receptacle SSW-114-01-G-D Samtec
L1 1 100uH Inductor, Shielded Drum Core, Ferrite,
100 µH, 1.5 A, 0.165 ohm, SMD SMD 7447714101 Wurth Elektronik
L2, L3, L4, L5 4 7uH Inductor, Toroid, Powdered Iron, 7 µH,
6.5 A, 0.0215 ohm, TH 28.6x12.3mm MA5173-AE Coilcraft
L6 1 10uH Inductor, Wirewound, 10 µH, 0.8 A,
0.204 ohm, SMD 2-Pin SMD, Body 4 x 4 mm, Height 1.2 mm NRS4012T100MDGJV Taiyo Yuden
Q1, Q2 2 60V MOSFET, N-CH, 60 V, 0.17 A, SOT-23 SOT-23 2N7002-7-F Diodes Inc.
R1, R3, R30 3 0 RES, 0, 5%, 0.1 W, 0603 0603 CRCW06030000Z0EA Vishay-Dale
R2 1 182k RES, 182 k, 1%, 0.125 W, 0805 0805 ERJ-6ENF1823V Panasonic
R4, R12, R36, R44 4 0 RES, 0, 5%, 0.125 W, 0805 0805 ERJ-6GEY0R00V Panasonic
R5, R10, R19, R23,
R33, R35 6 100 RES, 100, 1%, 0.1 W, 0603 0603 CRCW0603100RFKEA Vishay-Dale
R6 1 3.3 RES, 3.3, 5%, 0.1 W, 0603 0603 CRCW06033R30JNEA Vishay-Dale
R7, R8, R20, R21, R25,
R27, R37, R38, R41,
R42 10 10.0k RES, 10.0 k, 0.1%, 0.1 W, 0603 0603 RT0603BRD0710KL Yageo America
R9, R43, R45, R48, R61 5 100k RES, 100 k, 1%, 0.063 W, 0402 0402 CRCW0402100KFKED Vishay-Dale
R13 1 22.0k RES, 22.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0722KL Yageo America
R15 1 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 CRCW060310K0FKEA Vishay-Dale
R16 1 20.0k RES, 20.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0720KL Yageo America
R17 1 30.0k RES, 30.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0730KL Yageo America
R24, R28 2 47k RES, 47 k, 5%, 0.1 W, 0603 0603 RC0603JR-0747KL Yageo America
R26 1 3.30k RES, 3.30 k, 1%, 0.1 W, 0603 0603 RC0603FR-073K3L Yageo America
R29, R31 2 1.00k RES, 1.00 k, 1%, 0.1 W, 0603 0603 CRCW06031K00FKEA Vishay-Dale
R32 1 8.87k RES, 8.87 k, 1%, 0.1 W, 0603 0603 CRCW06038K87FKEA Vishay-Dale
R34 1 360 RES, 360, 5%, 0.063 W, 0402 0402 CRCW0402360RJNED Vishay-Dale
R39 1 4.99k RES, 4.99 k, 1%, 0.063 W, 0402 0402 CRCW04024K99FKED Vishay-Dale
R40 1 1.00k RES, 1.00 k, 1%, 0.063 W, 0402 0402 CRCW04021K00FKED Vishay-Dale
R46 1 10.0k RES, 10.0 k, 1%, 0.063 W, 0402 0402 CRCW040210K0FKED Vishay-Dale
R52, R59, R60, R62 4 0 RES, 0, 5%, 0.25 W, 1206 1206 CRCW12060000Z0EA Vishay-Dale
R53 1 1.00k RES, 1.00 k, 1%, 0.1 W, 0402 0402 ERJ-2RKF1001X Panasonic
R58 1 1.50k RES, 1.50 k, 1%, 0.063 W, 0402 0402 CRCW04021K50FKED Vishay-Dale
S1 1 Switch, SPDT, On-On, 2 Pos, TH Switch, 7x4.5mm 200USP1T1A1M2RE E-Switch
SH1, SH2, SH3, SH4,
SH5, SH6, SH7, SH8,
SH9, SH10, SH11,
SH12, SH13, SH14,
SH15, SH16, SH17,
SH18
18 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M