background image

2.6 Loop Characteristics

The TPS54331EVM-232 loop-response characteristics are shown in 

Figure 2-6

 . Gain and phase plots are 

shown for VIN voltage of 15 V. Load current for the measurement is 1.5 A.

-30

-20

-10

0

10

20

30

40

50

60

70

f - Frequency - Hz

-90

-60

-30

0

30

60

90

120

150

180

210

Phase-deg

10

100

1k

10k

100k

1M

Gain-dB

Figure 2-6. TPS54331 Loop Response

2.7 Output Voltage Ripple

The TPS54331EVM-232 output voltage ripple is shown in 

Figure 2-7

 . The output current is the rated full load of 

3 A. Voltage is measured directly across output capacitors.

V

OUT

PH

t - Time - 1

s/div

m

Figure 2-7. TPS54331 Output Ripple

www.ti.com

Test Setup and Results

SLVU247A – JULY 2008 – REVISED OCTOBER 2021

Submit Document Feedback

TPS54331 Step-Down Converter Evaluation Module User's Guide

7

Copyright © 2021 Texas Instruments Incorporated

Summary of Contents for TPS54331

Page 1: ...5 TPS54331 Transient Response 6 Figure 2 6 TPS54331 Loop Response 7 Figure 2 7 TPS54331 Output Ripple 7 Figure 2 8 TPS54331 Input Ripple 8 Figure 2 9 TPS54331 Start Up Relative to Vin 8 Figure 2 10 TP...

Page 2: ...ge is 30 V for the TPS54331EVM 232 Table 1 1 Input Voltage and Output Current Summary EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE TPS54331EVM 232 VIN 7 V to 28 V 0 A to 3 A 1 2 Performance Specificat...

Page 3: ...ion 1 R2 10 k 1 221 V V O 1 221 V 1 Table 1 3 lists the R6 values for some common output voltages Note that VIN must be in a range so that the minimum on time is greater than 150 ns and the maximum du...

Page 4: ...ble 2 1 EVM Connectors and Test Points REFERENCE DESIGNATOR FUNCTION J1 VIN see Table 1 1 for VIN range J2 2 pin header for enable Connect EN to ground to disable open to enable J3 2 pin header for sl...

Page 5: ...n the drain to source resistance of the MOSFETs 2 3 Output Voltage Load Regulation The load regulation for the TPS54331EVM 232 is shown in Figure 2 3 0 9985 0 999 0 9995 1 1 0005 1 001 1 0015 1 002 1...

Page 6: ...e TPS54331EVM 232 response to load transients is shown in Figure 2 5 The current step is from 25 to 75 of maximum rated load Total peak to peak voltage variation is as shown including ripple and noise...

Page 7: ...k 1M Gain dB Figure 2 6 TPS54331 Loop Response 2 7 Output Voltage Ripple The TPS54331EVM 232 output voltage ripple is shown in Figure 2 7 The output current is the rated full load of 3 A Voltage is me...

Page 8: ...age is applied and the output is inhibited by using a jumper at J2 to tie EN to GND When the jumper is removed EN is released When the EN voltage reaches the enable threshold voltage of 1 25 V the sta...

Page 9: ...5331 Start up Relative to Enable www ti com Test Setup and Results SLVU247A JULY 2008 REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step Down Converter Evaluation Module User s Guide 9 Copyri...

Page 10: ...vias placed around the board including four vias directly under the TPS54331 device to provide a thermal path from the top side ground traces to the bottom side ground plane The input decoupling capa...

Page 11: ...rom Top Side Figure 3 3 Top Side Assembly www ti com Board Layout SLVU247A JULY 2008 REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step Down Converter Evaluation Module User s Guide 11 Copyri...

Page 12: ...hematic Figure 4 1 is the schematic for the TPS54331EVM 232 Figure 4 1 TPS54331EVM 232 Schematic Schematic and Bill of Materials www ti com 12 TPS54331 Step Down Converter Evaluation Module User s Gui...

Page 13: ...Std Std 1 R2 68 1 k Resistor Chip 1 16W 1 0603 Std Std 1 R3 29 4 k Resistor Chip 1 16W 1 0603 Std Std 1 R4 0 Resistor Chip 1 16W 1 0603 Std Std 1 R5 10 2 k Resistor Chip 1 16W 1 0603 Std Std 1 R6 3 24...

Page 14: ...ther 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 tec...

Page 15: ...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 in...

Page 16: ...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 s...

Page 17: ...any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electr...

Page 18: ...R DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthe...

Page 19: ...change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of thes...

Reviews: