Texas Instruments TPS54386EVM User manual

User’s Guide
TPS54x86 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Description......................................................................................................................................................................... 2
1.2 Applications........................................................................................................................................................................2
1.3 Features............................................................................................................................................................................. 2
2 TPS54386EVM Electrical Performance Specifications........................................................................................................3
3 Schematic................................................................................................................................................................................4
3.1 Sequencing Jump (JP3).....................................................................................................................................................5
3.2 Enable Jumpers (JP1 and JP2)......................................................................................................................................... 5
3.3 Test Point Descriptions.......................................................................................................................................................5
4 4 Test Set Up........................................................................................................................................................................... 7
4.1 Equipment.......................................................................................................................................................................... 7
4.2 Equipment Setup................................................................................................................................................................8
4.3 Start Up / Shut Down Procedure......................................................................................................................................10
4.4 Output Ripple Voltage Measurement Procedure..............................................................................................................10
4.5 Control Loop Gain and Phase Measurement Procedure................................................................................................. 10
4.6 Equipment Shutdown....................................................................................................................................................... 10
5 TPS54386EVM Typical Performance Data and Characteristic Curves.............................................................................11
5.1 Efficiency.......................................................................................................................................................................... 11
5.2 Line and Load Regulation................................................................................................................................................ 12
5.3 Output Voltage Ripple...................................................................................................................................................... 12
5.4 Switch Node..................................................................................................................................................................... 13
5.5 Control Loop Bode Plot (low line, VIN = 8 V).................................................................................................................... 13
6 EVM Assembly Drawings and Layout.................................................................................................................................14
7 List of Materials.....................................................................................................................................................................17
8 Revision History................................................................................................................................................................... 17
List of Figures
Figure 3-1. TPS54386EVM Schematic........................................................................................................................................4
Figure 4-1. TPS54386EVM Recommended Test Set-Up............................................................................................................ 8
Figure 4-2. Tip and Barrel Measurement Technique (output ripple measurement using TP3 and TP4 or TP18 and TP19)....... 9
Figure 4-3. Control Loop Measurement Setup............................................................................................................................ 9
Figure 5-1. TPS54386EVM Efficiency verse Load Current VIN =9.6-13.2 V, VOUT1 = 5.0 V IOUT1 = 0-2 A, VOUT2 = 3.3 V
IOUT2 = 0-2 A...........................................................................................................................................................................11
Figure 5-2. TPS54386EVM Output Voltage verse Load Current VIN =9.6-13.2 V, VOUT1 = 5.0 V IOUT1 = 0-2 A, VOUT2 =
3.3 V IOUT2 = 0-2 A.................................................................................................................................................................12
Figure 5-3. TPS54386EVM Output Voltage Ripple (VIN = 13.2 V, IOUT1 = IOUT2 = 2 A)............................................................. 12
Figure 5-4. TPS54386EVM Switching Waveforms VIN = 12 V, IOUT = 2 A Ch1: TP9 (SW1), Ch2: TP12 (SW2).......................13
Figure 5-5. TPS54386EVM Gain and Phase vs Frequency...................................................................................................... 13
Figure 6-1. TPS54386EVM Component Placement (viewed from top)..................................................................................... 14
Figure 6-2. TPS54386EVM Top Copper (viewed from top)....................................................................................................... 15
Figure 6-3. TPS54386EVM Bottom Copper (x-ray view from top).............................................................................................16
List of Tables
Table 2-1. Electrical Performance Specifications.........................................................................................................................3
Table 3-1. Test Point Descriptions............................................................................................................................................... 5
Table 7-1. TPS54386EVM List of Materials............................................................................................................................... 17
Trademarks
All trademarks are the property of their respective owners.
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1 Introduction
The TPS54386EVM evaluation module (EVM) is a dual non-synchronous buck converter providing fixed 5.0-V
and 3.3-V output at up to 2 A each from a 12-V input bus. The EVM is designed to start up from a single supply,
so no additional bias voltage is required for start-up. The module uses the TPS54386 Dual Non-Synchronous
Buck Converter with Integral High-Side FET.
1.1 Description
TPS54386EVM is designed to use a regulated 12-V (+10% / -20%) bus to produce two regulated power rails, 5.0
V and 3.3 V at up to 2 A of load current each. TPS54386EVM is designed to demonstrate the TPS54386 in a
typical 12-V bus system while providing a number of test points to evaluate the performance of the TPS54386
in a given application. The EVM can be modified to other input or output voltages by changing some of the
components.
1.2 Applications
• Non-Isolated Low Current Point of Load and Voltage Bus Converters
• Consumer Electronics
• LCD TV
• Computer Peripherals
• Digital Set Top Box
1.3 Features
• 12-V (+10% / -20%) Input Range
• 5.0-V and 3.3-V Fixed Output Voltage, Adjustable with Resistor Change
• 2-ADC Steady State Output Current (3 A Peak)
• 600-kHz Switching Frequency (fixed by TPS54386)
• Internal Switching MOSFET and External Rectifier Diode
• Double Sided 2 Active Layer PCB (all components on top side, test point signals routed on internal layers)
• Active Converter Area Less than 1.8 Square Inches (0.89” x 1.97”)
• Convenient Test Points (used for probing switching waveforms and non-invasive loop response testing)
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2 TPS54386EVM Electrical Performance Specifications
Table 2-1. Electrical Performance Specifications
SYMBOL PARAMETER MIN TYP MAX UNITS
Input Characterstics
VIN Input coltage 9.6 12 13.2 V
IIN Input current VIN = nom, IOUT = max - 1.6 2.0 A
No load input current VIN = nom, IOUT = 0 A - 12 20 mA
VIN_UVLO Input UVLO IOUT = min to max 4.0 4.2 4.4 V
Output Characterstics
VOUT1 Output voltage 1 VIN = nom, IOUT = nom 4.85 5.0 5.15 V
VOUT2 Output voltage 2 VIN = nom, IOUT = nom 3.20 3.3 3.40
Line regulation VIN = min to max - - 1%
Load regulation IOUT = min to max - - 1%
VOUT_ripple Output voltage ripple VIN = nom, IOUT = max - - 30 mVpp
IOUT1 Output current 1 VIN = min to max 0 2.0
A
IOUT2 Output current 2 VIN = min to max 0 2.0
IOCP1
Output over current
Channel 1 VIN = nom, VOUT = VOUT1 - 5% 3.1 3.7 4.5
IOCP2
Output over current
Channel 2 VIN = nom, VOUT = VOUT2 - 5% 3.1 3.7 4.5
Systems Characterstics
FSW Switching frequency 510 630 750 kHz
ηpk Peak efficiency VIN = nom - 90% -
η Full load efficiency VIN = nom, IOUT = max - 85% -
Top Operating temperature
range VIN = min to max, IOUT = min to max 0 25 60 °C
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3 Schematic
+
Figure 3-1. TPS54386EVM Schematic
Note
For reference only, see Table 7-1, List of Materials for specific values.
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3.1 Sequencing Jump (JP3)
The TPS54386EVM provides a 3-pin, 100-mil header and shunt for programming the TPS54386’s sequencing
function. Placing the JP3 shunt in the left position connects the sequence pin to BP and sets the TPS54386
controller to sequence Channel 2 prior to Channel 1 when Enable 2 is activated. Placing the JP3 shunt in the
right position connects the sequence pin to GND and sets the TPS54386 converter to sequence Channel 1 prior
to Channel 1 when Enable 1 is activated. Removing the JP3 shunt disables sequencing and allows Channel 1
and Channel 2 to be enabled independently.
3.2 Enable Jumpers (JP1 and JP2)
TPS54386EVM provides separate 3-pin, 100-mil headers and shunts for exercising the TPS54386 Enable
functions. When JP3 is removed placing the JP1 shunt in the left position connects EN1 to ground and turns on
Output 1 and placing the JP2 shunt in the left position connects EN2 to ground and turns on Output 2.
When the JP3 shunt is in the LEFT position, placing the JP2 shunt in the left position connects EN2 to ground
and turns on first Output 2 and then Output 1.
When the JP3 shunt is in the RIGHT position, placing the JP1 shunt in the left position connects EN1 to ground
and turns on first Output 1 and then Output 2.
3.3 Test Point Descriptions
Table 3-1. Test Point Descriptions
TEST POINT LABLE USE SECTION
TP1 VIN Monitor input voltage Section 3.3.1
TP2 GND Ground for input voltage Section 3.3.1
TP3 VOUT1 Monitor VOUT1 Voltage Section 3.3.2
TP4 GND Ground for VOUT1 voltage Section 3.3.2
TP5 GND Ground for Channel B loop monitoring Section 3.3.3
TP6 CHB Channel B for loop monitoring Section 3.3.3
TP7 GND Ground for Channel A loop monitoring Section 3.3.3
TP8 CHA Channel A for loop monitoring Section 3.3.3
TP9 SW1 Monitor switching node of Channel 1 Section 3.3.4
TP10 GND Ground for switch node of Channel 1 Section 3.3.4
TP11 IC_GND Monitor device ground Section 3.3.5
TP12 SW2 Monitor switching node of Channel 2 Section 3.3.6
TP13 GND Ground for switch node of Channel 2 Section 3.3.6
TP14 CHA Channel A for loop monitoring Section 3.3.7
TP15 GND Ground for Channel A loop monitoring Section 3.3.7
TP16 CHB Channel B for loop monitoring Section 3.3.7
TP17 GND Ground for Channel B loop monitoring Section 3.3.7
TP18 VOUT2 Monitor VOUT2 voltage Section 3.3.8
TP19 GND Ground for VOUT2 voltage Section 3.3.8
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3.3.1 Input Voltage Monitoring (TP1 and TP2)
TPS54386EVM provides two test points for measuring the voltage applied to the module. This allows the
user to measure the actual module voltage without losses from input cables and connectors. All input voltage
measurements should be made between TP1 and TP2. To use TP1 and TP2, connect a voltmeter positive
terminal to TP1 and negative terminal to TP2.
3.3.2 Channel 1 Output Voltage Monitoring (TP3 and TP4)
TPS54386EVM provides two test points for measuring the voltage generated by the module. This allows the
user to measure the actual module output voltage without losses from output cables and connectors. All output
voltage measurements should be made between TP3 and TP4. To use TP3 and TP4, connect a voltmeter
positive terminal to TP3 and negative terminal to TP4. For Output ripple measurements, TP3 and TP4 allow a
user to limit the ground loop area by using the Tip and Barrel measurement technique shown in Figure 4-2. All
output ripple measurements should be made using the Tip and Barrel measurement.
3.3.3 Channel 1 Loop Analysis (TP5, TP6, TP7 and TP8)
TPS54386EVM contains a 51-Ω series resistor (R1) in the feedback loop to allow for matched impedance signal
injection into the feedback for loop response analysis. An isolation transformer should be used to apply a small
(30 mV or less) signal across R1 through TP6 and TP8. By monitoring the ac injection level at TP8 and the
returned ac level at TP6, the power supply loop response can be determined.
3.3.4 Channel 1 Switching Waveforms (TP9 and TP10)
TPS54386EVM provides a test point and a local ground connection (TP10) for the monitoring of the Channel 1
power stage switching waveform. Connect an oscilloscope probe to TP9 to monitor the switch node voltage for
Channel 1.
3.3.5 TPS54386 Device Ground (TP11)
TPS54386EVM provides a test point for the device ground. To measure the device pin voltages, connect the
ground of the oscilloscope probe to TP11.
3.3.6 Channel 2 Switching Waveforms (TP12 and TP13)
TPS54386EVM provides a test point and a local ground connection (TP13) for the monitoring of the Channel 1
power stage switching waveform. Connect an oscilloscope probe to TP12 to monitor the switch node voltage for
Channel 1.
3.3.7 Channel 2 Loop Analysis (TP14, TP15, TP16 and TP17)
TPS54386EVM contains a 51-Ω series resistor (R10) in the feedback loop to allow for matched impedance
signal injection into the feedback for loop response analysis. An isolation transformer should be used to apply a
small (30 mV or less) signal across R10 through TP14 and TP16. By monitoring the ac injection level at TP14
and the returned ac level at TP16, the power supply loop response can be determined.
3.3.8 Output Voltage Monitoring (TP18 and TP19)
TPS54386EVM provides two test points for measuring the voltage generated by the module. This allows the
user to measure the actual module output voltage without losses from output cables and connector losses. All
output voltage measurements should be made between TP18 and TP19. To use TP18 and TP19, connect a
voltmeter positive terminal to TP18 and negative terminal to TP19. For output ripple measurements, TP18 and
TP19 allow a user to limit the ground loop area by using the Tip and Barrel measurement technique shown in
Figure 4-2. All output ripple measurements should be made using the Tip and Barrel measurement.
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4 4 Test Set Up
4.1 Equipment
4.1.1 Voltage Source
VIN: The input voltage source (VIN) should be a 0-15 V variable dc source capable of 5 ADC. Connect VIN to J1
as shown in Figure 4-2.
4.1.2 Meters
• A1: 0-3 ADC, ammeter
• V1: VIN, 0-15 V voltmeter
• V2: VOUT1 0-6 V voltmeter
• V3: VOUT2 0-4 V voltmeter
4.1.3 Loads
LOAD1: The Output1 Load (LOAD1) should be an electronic constant current mode load capable of 0-2 ADC at
5.0 V
LOAD2: The Output2 Load (LOAD2) should be an electronic constant current mode load capable of 0-2 ADC at
3.3 V
4.1.4 Oscilloscope
Oscilloscope: A digital or analog oscilloscope can be used to measure the ripple voltage on VOUT. The
oscilloscope should be set for 1-MΩ impedance, 20-MHz bandwidth, ac coupling, 1-μs/division horizontal
resolution, 10-mV/division vertical resolution for taking output ripple measurements. TP3 and TP4 or TP18 and
TP19 can be used to measure the output ripple voltages by placing the oscilloscope probe tip through TP3 or
TP18 and holding the ground barrel to TP4 or TP19 as shown in Figure 4-2. For a hands free approach, the loop
in TP4 or TP19 can be cut and opened to cradle the probe barrel. Using a leaded ground connection may induce
additional noise due to the large ground loop area.
4.1.5 Recommended Wire Gauge
VIN to J1: The connection between the source voltage, VIN and J1 of HPA241 can carry as much as 5 ADC. The
minimum recommended wire size is AWG #16 with the total length of wire less than 4 feet (2 feet input, 2 feet
return).
J2 to LOAD1: The power connection between J2 of HPA241 and LOAD1 can carry as much as 2 ADC. The
minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot
return).
J3 to LOAD2: The power connection between J3 of HPA241 and LOAD2 can carry as much as 2 ADC. The
minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot
return).
4.1.6 Other
Fan: This evaluation module includes components that can get hot to the touch, because this EVM is not
enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is recommended to reduce
component surface temperatures to prevent user injury. The EVM should not be left unattended while powered.
The EVM should not be probed while the fan is not running.
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4.2 Equipment Setup
Shown in Figure 4-1 is the basic test set up recommended to evaluate the TPS54386EVM. Please note that
although the return for J1, J2 and JP3 are the same system ground, the connections should remain separate as
shown in Figure 4-1
4.2.1 Procedure
1. Working at an ESD workstation, make sure that any wrist straps, bootstraps or mats are connected
referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and safety
glasses should also be worn.
2. Prior to connecting the dc input source, VIN, it is advisable to limit the source current from VIN to 5.0 A
maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 4-1.
3. Connect the ammeter A1 (0-5 A range) between VIN and J1 as shown in Figure 4-1.
4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 4-1.
5. Connect LOAD1 to J2 as shown in Figure 4-1. Set LOAD1 to constant current mode to sink 0 ADC before
VIN is applied.
6. Connect voltmeter, V2 across TP3 and TP4 as shown in Figure 4-1.
7. Connect LOAD2 to J3 as shown in Figure 4-1. Set LOAD2 to constant current mode to sink 0 ADC before
VIN is applied.
8. Connect voltmeter, V3 across TP18 and TP19 as shown in Figure 4-1.
9. Place fan as shown in Figure 4-1 and turn on, making sure air is flowing across the EVM.
4.2.2 Diagram
FAN
LOAD1
5.0V @
2A
-
+
V2
-
+
See Tip and Barrel
Measurement for Vout
ripple
Oscilloscope
1MW, AC
20mV / div
20MHz
LOAD2
3.3V @
2A
+
-
V3
-
+
V1
+
-
A1
-
+
V
VIN
Figure 4-1. TPS54386EVM Recommended Test Set-Up
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TP4 /
TP19
TP3 /
TP18
Metal Ground Barrel
Probe Tip
Tip and Barrel Vout ripple measurement
Figure 4-2. Tip and Barrel Measurement Technique (output ripple measurement using TP3 and TP4 or
TP18 and TP19)
FAN
V1
+
-
A1
-
+
V
VIN
LOAD1
5.0V @
2A
-
+
V2
-
+
LOAD2
3.3V @
2A
+
-
V3
-
+
Isolation
Transformer
Figure 4-3. Control Loop Measurement Setup
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4.3 Start Up / Shut Down Procedure
1. Increase VIN from 0 V to 12 VDC.
2. Vary LOAD1 from 0 – 2 ADC
3. Vary LOAD2 from 0 – 2 ADC
4. Vary VIN from 9.6 VDC to 13.2 VDC
5. Decrease VIN to 0 VDC
6. Decrease LOAD1 to 0 A.
4.4 Output Ripple Voltage Measurement Procedure
1. Increase VIN from 0 V to 12 VDC.
2. Adjust LOAD1 to desired load between 0 ADC and 2 ADC.
3. Adjust VIN to desired load between 9.6 VDC and 13.2 VDC.
4. Connect oscilloscope probe to TP3 and TP4 or TP18 and TP19 as shown in Figure 4-2.
5. Measure output ripple.
6. Decrease VIN to 0 VDC.
7. Decrease LOAD1 to 0 A.
4.5 Control Loop Gain and Phase Measurement Procedure
1. Connect 1 kHz to 1 MHz isolation transformer to TP6 and TP8 as show in Figure 4-3.
2. Connect input signal amplitude measurement probe (Channel A) to TP8 as shown in Figure 4-3.
3. Connect output signal amplitude measurement probe (Channel B) to TP6 as shown in Figure 4-3.
4. Connect ground lead of Channel A and Channel B to TP5 & TP7 as shown in Figure 4-3.
5. Inject 30 mV or less signal across R1 through isolation transformer.
6. Sweep frequency from 1 kHz to 1 MHz with 10 Hz or lower post filter.
7. Control loop gain can be measured by:
20 ChannelB LOG
ChannelA
æ ö
´ç ÷
è ø
8. Control loop phase is measured by the phase difference between Channel A and Channel B.
9. Control loop for Channel 2 can be measured by making the following substitutions.
a. Change TP6 to TP16
b. Change TP8 to TP14
c. Change TP5 to TP17
d. Change TP7 to TP15
10. Disconnect isolation transformer before making any other measurements (signal injection into feedback may
interfere with accuracy of other measurements).
4.6 Equipment Shutdown
1. Shut down oscilloscope
2. Shut down VIN
3. Shut down LOAD1
4. Shut down fan
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5 TPS54386EVM Typical Performance Data and Characteristic Curves
Figure 5-1 through Figure 5-5 present typical performance curves for the TPS54386EVM. Since actual
performance data can be affected by measurement techniques and environmental variables, these curves are
presented for reference and may differ from actual field measurements.
5.1 Efficiency
0.10 1.24
ILOAD - Load Current - A
95
85
80
75
60
0.48 0.86 1.62
90
h- Efficiency - %
EFFICIENCY(V
OUT = 5.0 V)
vs
LOADCURRENT
70
65
ILOAD - Load Current - A
90
75
65
60
85
h- Efficiency - %
EFFICIENCY(V
OUT = 3.3 V)
vs
LOADCURRENT
50
2.00
13.2 V
9.6 V
12.0 V
0.10 1.240.48 0.86 1.62 2.00
13.2 V
9.6 V
12.0 V
55
70
80
Figure 5-1. TPS54386EVM Efficiency verse Load Current VIN =9.6-13.2 V, VOUT1 = 5.0 V IOUT1 = 0-2 A, VOUT2
= 3.3 V IOUT2 = 0-2 A
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5.2 Line and Load Regulation
0.10 1.62
ILOAD - Load Current - A
5.020
5.010
5.000
0.48 1.24 2.00
5.015
h- Efficiency - %
EFFICIENCY(V
OUT2 = 5.0 V)
vs
LOADCURRENT
5.005
ILOAD - Load Current - A
3.340
h- Efficiency - %
EFFICIENCY(V
OUT1 = 3.3 V)
vs
LOADCURRENT
3.320
3.333
3.330
3.325
3.338
13.2 V
9.6 V
12.0 V
13.2 V
9.6 V
12.0 V
3.323
3.335
0.860.10 1.620.48 1.24 2.000.86
3.328
Figure 5-2. TPS54386EVM Output Voltage verse Load Current VIN =9.6-13.2 V, VOUT1 = 5.0 V IOUT1 = 0-2 A,
VOUT2 = 3.3 V IOUT2 = 0-2 A
5.3 Output Voltage Ripple
Figure 5-3. TPS54386EVM Output Voltage Ripple (VIN = 13.2 V, IOUT1 = IOUT2 = 2 A)
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5.4 Switch Node
Figure 5-4. TPS54386EVM Switching Waveforms VIN = 12 V, IOUT = 2 A Ch1: TP9 (SW1), Ch2: TP12 (SW2)
5.5 Control Loop Bode Plot (low line, VIN = 8 V)
f - Frequency - Hz
72
0
-72
100 1000
36
Gain - dB
GAIN/PHASE
vs
FREQUENCY(V
OUT = 5.0 V, IOUT = 2 A)
-36
10
Gain
Phase
-48
-60
-12
-24
24
12
60
48
90
-45
-180
Phase - °
-135
-90
0
45
0
GAIN/PHASE
vs
FREQUENCY(V
OUT = 3.3 V, IOUT = 2 A)
f - Frequency - Hz
100 1000100
100
20
-60
60
Gain - dB
-20
-40
0
40
80
Phase - °
90
-45
-90
0
45
Gain
Phase
Figure 5-5. TPS54386EVM Gain and Phase vs Frequency
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6 EVM Assembly Drawings and Layout
The following figures (Figure 6-1 through Figure 6-3) show the design of the TPS54386EVM printed circuit
board. The EVM has been designed using a 4-Layer, 2-oz copper-clad circuit board 3.0” x 3.0” with all
components in a 1.15” x 2.15” active area on the top side and all active traces to the top and bottom layers
to allow the user to easily view, probe and evaluate the TPS54386 control device in a practical double-sided
application. Moving components to both sides of the PCB or using additional internal layers can offer additional
size reduction for space constrained systems.
Figure 6-1. TPS54386EVM Component Placement (viewed from top)
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Figure 6-2. TPS54386EVM Top Copper (viewed from top)
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Figure 6-3. TPS54386EVM Bottom Copper (x-ray view from top)
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7 List of Materials
Table 7-1. TPS54386EVM List of Materials
QTY REF DES DESCRIPTION MFR PART NUMBER
1 C1 Capacitor, aluminum, 25 V, ±20%, 100 μF, 0.328 x 0.390
inch
Panasonic EEEFC1E101P
2 C10, C11 Capacitor, ceramic, 25 V, X5R, 20%, 10 μF, 1210 TDK C3216X5R1E106M
1 C12 Capacitor, ceramic, 10 V, X5R, 20%, 4.7 μF, 0805 Std Std
1 C15 Capacitor, ceramic, 25 V, X7R, 20%, 22 nF, 0603 Std Std
2 C2, C20 Capacitor, ceramic, 10 V, X7R, 20%, 0.1 μF, 0603 Std Std
4 C3, C4, C18, C19 Capacitor, ceramic, 6.3 V, X5R, 20%, 10 μF, 0805 TDK C2012X5R0J106M
2 C5, C17 Capacitor, ceramic, 6.3 V, X5R, 20%, 47 μF, 1206 Std Std
2 C7, C14 Capacitor, ceramic, 25 V, X7R, 20%, 470 pF, 0603 Std Std
1 C8 Capacitor, ceramic, 25 V, X7R, 20%, 33 nF, 0603 Std Std
2 C9, C13 Capacitor, ceramic, 25 V, X7R, 20%, 0.047 μF, 0603 Std Std
2 D1, D2 Diode, Schottky, 3 A, 30 V, MBRS330T3, SMC On Semi MBRS330T3
2 L1, L2 Inductor, power, 4.38 A, 0.02 Ω, 8.2 μH, 0.402 x 0.392
inch
Coilcraft MSS1048-822L
2 R1, R10 Resistor, chip, 1/16 W, 5%, 51 Ω, 0603 Std Std
2 R2, R9 Resistor, chip, 1/16 W, 1%, 20 kΩ, 0603 Std Std
2 R3, R8 Resistor, chip, 1/16 W, 5%, 10 Ω, 0603 Std Std
1 R4 Resistor, chip, 1/16 W, 1%, 3.83 kΩ, 0603 Std Std
3 R5, R6, R11 Resistor, chip, 1/16 W, 5%, 0 Ω, 0603 Std Std
1 R7 Resistor, chip, 1/16 W, 1%, 6.49 kΩ, 0603 Std Std
1 R12 Resistor, chip, 1/16 W, 1%, 1.54 kΩ, 0603 Std Std
1 R13 Resistor, chip, 1/16 W, 1%, 3.32 kΩ, 0603 Std Std
3 TP1, TP3, TP18 Test point, red, thru hole, 5010, 0.125 x 0.125 inch Keystone 5010
1 U1** TPS54386PWP, HTSSOP-14 TI TPS54386PWP
8 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (March 2008) to Revision A (October 2021) Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
• Updated the user's guide title............................................................................................................................. 2
www.ti.com List of Materials
SLUU286A – MARCH 2008 – REVISED OCTOBER 2021
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TPS54x86 Step-Down Converter Evaluation Module User's Guide 17
Copyright © 2021 Texas Instruments Incorporated

STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

www.ti.com
2
3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software
associated with the kit to determine whether to incorporate such items in a finished product and software developers to write
software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or
otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition
that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.
Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must
operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
FCC Interference Statement for Class B EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
3.2 Canada
3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247
Concerning EVMs Including Radio Transmitters:
This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Concernant les EVMs avec appareils radio:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation
est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit
accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concerning EVMs Including Detachable Antennas:
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)
gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type
and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for
successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types
listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.
Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited
for use with this device.

www.ti.com
3
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et
d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage
radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope
rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le
présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le
manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne
non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de
l'émetteur
3.3 Japan
3.3.1 Notice for EVMs delivered in Japan: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 日本国内に
輸入される評価用キット、ボードについては、次のところをご覧ください。
http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page
3.3.2 Notice for Users of EVMs Considered “Radio Frequency Products” in Japan: EVMs entering Japan may not be certified
by TI as conforming to Technical Regulations of Radio Law of Japan.
If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required to follow the
instructions set forth by Radio Law of Japan, which includes, but is not limited to, the instructions below with respect to EVMs
(which for the avoidance of doubt are stated strictly for convenience and should be verified by User):
1. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal
Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for
Enforcement of Radio Law of Japan,
2. Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to
EVMs, or
3. Use of EVMs only after User obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan
with respect to EVMs. Also, do not transfer EVMs, unless User gives the same notice above to the transferee. Please note
that if User does not follow the instructions above, User will be subject to penalties of Radio Law of Japan.
【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて
いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの
措置を取っていただく必要がありますのでご注意ください。
1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用
いただく。
2. 実験局の免許を取得後ご使用いただく。
3. 技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ
ンスツルメンツ株式会社
東京都新宿区西新宿６丁目２４番１号
西新宿三井ビル
3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧ください。http:/
/www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
3.4 European Union
3.4.1 For EVMs subject to EU Directive 2014/30/EU (Electromagnetic Compatibility Directive):
This is a class A product intended for use in environments other than domestic environments that are connected to a
low-voltage power-supply network that supplies buildings used for domestic purposes. In a domestic environment this
product may cause radio interference in which case the user may be required to take adequate measures.