Texas Instruments TPA3121D2 User manual

1 Introduction
1.1 Description
User's GuideSLOU221 – June 2008
TPA3121D2 Audio Power Amplifier Evaluation Module
Contents1 Introduction ................................................................................................................... 11.1 Description ........................................................................................................... 11.2 TPA3121D2 EVM Specifications ................................................................................. 32 Operation ..................................................................................................................... 32.1 Quick Start List for Stand-Alone Operation ...................................................................... 33 Reference ..................................................................................................................... 43.1 TPA3121D2 EVM Schematic...................................................................................... 43.2 TPA3121D2 EVM PCB Layers .................................................................................... 53.3 TPA3121D2EVM Bill of Materials................................................................................. 7
List of Figures
1 The TI TPA3121D2 Audio Power Amplifier EVM – Top View ......................................................... 22 The TI TPA3121D2 Audio Power Amplifier EVM – Bottom View ..................................................... 23 TPA3121D2 EVM Schematic............................................................................................... 44 TPA3121D2 EVM – Top Side Layout ..................................................................................... 55 TPA3121D2 EVM – Bottom Side Layout ................................................................................. 6
List of Tables
1 Gain Settings ................................................................................................................. 3
The TPA3121D2 evaluation module consists of a single 20W, class-D, stereo audio power amplifiercomplete with a small number of external components mounted on a circuit board that can be used todirectly drive speakers with an external analog audio source as the input.
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Introduction www.ti.com
Figure 1. The TI TPA3121D2 Audio Power Amplifier EVM – Top View
Figure 2. The TI TPA3121D2 Audio Power Amplifier EVM – Bottom View
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1.2 TPA3121D2 EVM Specifications
2 Operation
2.1 Quick Start List for Stand-Alone Operation
2.1.1 Power Supply
2.1.2 Evaluation Module Preparations
www.ti.com Operation
V
CC
Supply voltage range 10V to 26VI
CC
Supply current 3A maxP
O
Continuous output power per channel: 8 Ω, VCC = 24 V, THD+N = 10% 10 WR
L
Minimum load impedance 6 Ω
Follow these steps to use the TPA3121D2EVM stand-alone or when connecting it into existing circuits orequipment. Connections to the EVM module can be made by inserting stripped wire or using bananaplugs for the power supply and output connections. The inputs accept standard RCA plugs.
1. Ensure that all external power sources are set to OFF.2. Connect an external regulated power supply adjusted from 10V–26V to the module VCC (J7) and GND(J8) banana jacks taking care to observe marked polarity.
Inputs and Outputs1. Connect a speaker across GND ( J5) and +ROUT ( J6). Connect another speaker across LOUT ( J3)and GND ( J4)2. Install both gain jumpers GAIN0 ( J1) and GAIN1 ( J2). This will set the gain of the amplifier to thelowest level, 20dB.
Control Inputs1. SHUTDOWN: This terminal is active LOW. A LOW on the device terminal ( < 0.8V) shuts down theamplifier; a HIGH (>2V) on the device terminal places the amplifier in the active state. Holding downswitch SW1 will place the amplifier in the SHUTDOWN state. Releasing SW1 will return the amplifier tothe active state. This terminal is Vcc compliant.2. MUTE: This terminal is active HIGH. A HIGH (>2V) on this terminal will immediately terminate audioplayback through the speakers; a LOW ( < 0.8V) will enable the device. The outputs will remainswitching with fifty percent duty cycle. SW2 on the EVM controls the state of the MUTE terminal.Holding down switch SW2 will place the amplifier in the MUTE state. Releasing SW2 will return theamplifier to the active state. This terminal is Vcc compliant.3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. Refer to Table 1 below.Installing a jumper in J1 or J2 will set the respective terminal to GND. Removing the jumper will set therespective terminals to VCC. Removing jumpers will INCREASE the gain while installing jumpers willDECREASE the gain. Logic levels are TTL compatible. These terminals are Vcc compliant
Table 1. Gain Settings
(1)
GAIN0 (J1) GAIN1 (J2) Amplifier Gain (dB)
ON ON 20ON OFF 26OFF ON 32OFF OFF 36(1)
OFF = Jumper REMOVED; ON = Jumper INSTALLED
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2.1.3 Power Up
3 Reference
3.1 TPA3121D2 EVM Schematic
RIGHT_OUT
LEFT_IN
RIGHT_IN
LEFT_OUT
VCC
VCC
VCC
VCC
VCC
C9 DNI
C16 DNI
R3
10K
R3
10K
J4
GND
J4
GND
TP4TP4
SW1
SHUTDOWN
SW1
SHUTDOWN
U1
TPA3121D2
U1
TPA3121D2
PVCCL1
1
SDZ
2
PVCCL2
3
MUTE
4
LIN
5
RIN
6
BYP
7
GND1
8
GND2
9
PVCCR1
10
VCLAMP
11
PVCCR2
12 PVSSR2 13
PVSSR1 14
OUTR 15
BSR 16
GAIN1 17
GAIN0 18
AVCC2 19
AVCC1 20
BSL 21
OUTL 22
PVSSL2 23
PVSSL1 24
THERMAL
25
C14
0.1uF C14 0.1uF
TP5TP5
R6
4.7K
R6
4.7K
L2
33uH
L2
33uH
J7
VCC
J7
VCC
C6
1.0uF C6 1.0uF
R9
0
R9
0
R4
10K
R4
10K
TP12
RGND
TP12
RGND
SW2
MUTE
SW2
MUTE
TP3TP3
C12 0.22uFC12 0.22uF C9
0.22uF
C9
0.22uF
R7
4.7K
R7
4.7K
+
C8
470uF
+
C8
470uF
1
2
J8
GND
J8
GND
TP2TP2
J10
RIN
J10
RIN
2
3
1
J9
LIN
J9
LIN
2
3
1
+
C10
470uF
+
C10
470uF
1 2
TP10
GND
TP10
GND
C16
0.22uF
C16
0.22uF
R1
10K
R1
10K
C15 0.22uFC15 0.22uF
TP7
RIGHT_OUT
TP7
RIGHT_OUT
J5
GND
J5
GND
J1
GAIN0
J1
GAIN0
1
2
+
C17
470uF
+
C17
470uF
1 2
C3
1.0uF
C3
1.0uF
J3
+LOUT
J3
+LOUT
TP11
LGND
TP11
LGND
TP1
LEFT_IN
TP1
LEFT_IN
C19
0.22uF
C19
0.22uF
R2
10K
R2
10K
+
C2
470uF
+
C2
470uF
1
2
J6
+ROUT
J6
+ROUT
R10
0
R10
0
C13
10uF C13 10uF
C4
1.0uF
C4
1.0uF
J2
GAIN1
J2
GAIN1
1
2
C7 0.1uFC7 0.1uF
C20
0.22uF
C20
0.22uF
TP6
LEFT_OUT
TP6
LEFT_OUT
C1 0.1uFC1 0.1uF
TP9
INPUT_GND
TP9
INPUT_GND
TP8
RIGHT_IN
TP8
RIGHT_IN
L1
33uH
L1
33uH
C5
1.0uF C5 1.0uF
Reference www.ti.com
1. Verify correct voltage and input polarity and turn the external power supplies ON.The EVM should begin operation2. Adjust the input signal.3. Adjust the control inputs to the desired settings.4. Adjust the amplifier gain by installing/removing the gain jumpers, J1 and J2.
Figure 3. TPA3121D2 EVM Schematic
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3.2 TPA3121D2 EVM PCB Layers
www.ti.com Reference
Figure 4. TPA3121D2 EVM – Top Side Layout
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Reference www.ti.com
Figure 5. TPA3121D2 EVM – Bottom Side Layout
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3.3 TPA3121D2EVM Bill of Materials
www.ti.com Reference
Reference Description Load Status Size Qty MFR Part Number
ALL COMPONENTS SHOULD BE ORDERED AS LEAD-FREE
C1, C7, C14 Capacitor, ceramic, 0.1 µF, ±10%, X7R, 50V 0603 3 TDK C1608X7R1H104KT
C2, C8, C10, Capacitor, electrolytic, 470 µF, 35V, 105C, Low impedance Radial 4 Nichicon UHE1V471MH06C17
C3, C4, C5, C6, Capacitor, ceramic, 1.0 µF, ±10%, X7R, 16V 0603 4 Taiyo Yuden EMK107BJ105KA-TR
C9, C16 Capacitor, ceramic, 0.22 µF, ±10%, X7R, 50V do not install 1206 2 Kemet C1206C684K5RACTU
C11 Capacitor, electrolytic, 220 µF, 35V, 85 °C, General Purpose Radial 1 Panasonic ECA-1VM221B
C12, C15 Capacitor, ceramic, 0.22 µF, ±10%, X7R, 16V 0603 2 TDK C1608X7R1C224KT
C13 Capacitor, ceramic, 10 µF, +80%/–20%, Y5V, 50V 1210 1 Murata GRM32DF51H106ZA01L
C19, C20 Capacitor, metal poly, 0.22 µF, 63V Radial 2 Epcos, Inc. B32559C224K000
L1–L2 Inductor, 33 µH, radial lead, ferrite material, shielded Radial 2 Toko A7503AY-330M
R1–R4 Resistor, chip, 10 k Ω, 1/16 W, 5% 0603 4 Panasonic ERA-V15J103V
R6, R7 Resistor, chip, 4.7 k Ω, 1/10 W, 5% 603 2 Panasonic ERJ-3GEYJ472V
R9, R10 Resistor, chip, 0 Ω, 1/10 W, 5% 603 2 Panasonic ERJ-3GEY0R00V
R11 Resistor, chip, 220 Ω, 1/4 W, 1% 1206 1 Panasonic ERJ-SENF2200V
J1–J2 Phono Jack, PC mount, switched 2 Switchcraft PJRAN1X1U03
J3–J8 Banana Jack w/knurled Thumbnut (nickel plate) 6 Johnson 111-2223-001
J9–J10 Header, 2 position, Male 2mm 2 Norcomp 2163-36-01-P2
JP9–JP10 SHUNT, 2MM 2mm 2 Specialty 2JM-G(shunts)
SW1, SW2 SWITCH, MOMENTARY, SMD, LOW PROFILE 2 Panasonic EVQ-PPBA25
Standoffs, 5/8" length, 4-40 thread 4 Keystone 1808
Screws, 4-40, 0.375 4
U1 TPA3121D2PWP 24 pin 1 TI TPA3121D2PWPTSSOP
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 10 V to 26 V and input current of 3 A maximum.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning the input range, please contact a TI field representative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 60 °C . The EVM is designed to operateproperly with certain components above 60 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,please be aware that these devices may be very warm to the touch.
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