background image

2.5 Load Transients

Figure 2-5

 shows the TPS54521EVM-607 response to load transients. The current step is from 2 A to 4 A at 12 

V input. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output.

Time = 10 μsec / div

Vout = 100 mV / div (AC coupled)

Iout = 2 A / div (2A to 4 A load step)

Vin = 12 V

Figure 2-5. TPS54521EVM-607 Transient Response

2.6 Loop Characteristics

Figure 2-6

 shows the TPS54521EVM-607 loop-response characteristics. Gain and phase plots are shown for V

IN 

voltage of 12 V. Load current for the measurement is 5 A.

-60

-50

-40

-30

-20

-10

0

10

20

30

40

50

60

Frequency - Hz

-180

-150

-120

-90

-60

-30

0

30

60

90

120

150

180

Gain - dB

100

1000

10000

100000

1000000

Phase - Deg

Phase

Gain

Vin = 12 V

Load = 5 A

Figure 2-6. TPS54521EVM-607 Loop Response

Test Setup and Results

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TPS54521 Step-Down Converter Evaluation Module User's Guide

SLVU379A – AUGUST 2010 – REVISED AUGUST 2021

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Summary of Contents for TPS54521EVM-607

Page 1: ...607 Transient Response 8 Figure 2 6 TPS54521EVM 607 Loop Response 8 Figure 2 7 TPS54521EVM 607 Output Ripple 9 Figure 2 8 TPS54521EVM 607 Input Ripple 9 Figure 2 9 TPS54521EVM 607 Start Up Relative to...

Page 2: ...aterials 17 Trademarks All trademarks are the property of their respective owners Trademarks www ti com 2 TPS54521 Step Down Converter Evaluation Module User s Guide SLVU379A AUGUST 2010 REVISED AUGUS...

Page 3: ...521EVM 607 Table 1 1 Input Voltage and Output Current Summary EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE TPS54521EVM 607 VIN 8 V to 17 V VIN start voltage 6 806 V 0 A to 5 A 1 2 Performance Specific...

Page 4: ...21 5 3 3 31 6 5 52 3 1 3 2 Slow Start Time The slow start time can be adjusted by changing the value of C7 Use Equation 2 to calculate the required value of C7 for a desired slow start time Tss ms Iss...

Page 5: ...f 20 AWG wires The maximum load current capability must be 5 A Wire lengths must be minimized to reduce losses in the wires Test point TP1 provides a place to monitor the VIN input voltages with TP2 p...

Page 6: ...VM 607 at lower output currents below 0 10 A at an ambient temperature of 25 C 0 10 20 30 40 50 60 70 80 90 100 0 01 0 02 0 03 0 04 0 05 0 06 0 07 0 08 0 09 0 1 Efficiency I Output Current A O V 12 V...

Page 7: ...mbient temperature of 25 C 2 4 Output Voltage Line Regulation Figure 2 4 shows the line regulation for the TPS54521EVM 607 0 05 0 04 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04 0 05 8 9 10 11 12 13 14 15 16...

Page 8: ...igure 2 6 shows the TPS54521EVM 607 loop response characteristics Gain and phase plots are shown for VIN voltage of 12 V Load current for the measurement is 5 A 60 50 40 30 20 10 0 10 20 30 40 50 60 F...

Page 9: ...8 Input Voltage Ripple Figure 2 8 shows the TPS54521EVM 607 input voltage ripple The output current is the rated full load of 5 A and VIN 12 V The ripple voltage is measured directly across the input...

Page 10: ...enable threshold voltage the start up sequence begins and the output voltage ramps up to the externally set value of 3 3 V The input voltage for these plots is 12 V and the load is 0 66 Time 2 msec d...

Page 11: ...Overcurrent Hiccup Mode 2 11 Thermal Characteristics This section shows a thermal image of the TPS54521EVM 607 running at 12 V input and 5 A load and a graph showing the junction temperature vs outpu...

Page 12: ...oom temperature no airflow 3 5 4 4 5 5 Figure 2 13 TPS54521EVM 607 Junction Temperature vs Load Current Test Setup and Results www ti com 12 TPS54521 Step Down Converter Evaluation Module User s Guide...

Page 13: ...plane to the bottom side ground plane The input decoupling capacitors C2 and C3 and bootstrap capacitor C5 are all located as close to the IC as possible In addition the voltage set point resistor di...

Page 14: ...d Circuit Area The estimated printed circuit board area for the components used in this design is 246 in2 0 38 mm2 This area does not include test point or connectors Board Layout www ti com 14 TPS545...

Page 15: ...f materials 4 1 Schematic Figure 4 1 is the schematic for the TPS54521EVM 607 www ti com Schematic and Bill of Materials SLVU379A AUGUST 2010 REVISED AUGUST 2021 Submit Document Feedback TPS54521 Step...

Page 16: ...Schematic Schematic and Bill of Materials www ti com 16 TPS54521 Step Down Converter Evaluation Module User s Guide SLVU379A AUGUST 2010 REVISED AUGUST 2021 Submit Document Feedback Copyright 2021 Tex...

Page 17: ...2L Coilcraft 1 R1 511 K Resistor Chip 1 16W 1 0603 Std Std 2 R2 R3 100 K Resistor Chip 1 16W 1 0603 Std Std 1 R4 38 3 K Resistor Chip 1 16W 1 0603 Std Std 1 R7 51 1 Resistor Chip 1 16W 1 0603 Std Std...

Page 18: ...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 19: ...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 20: ...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 21: ...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 22: ...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 23: ...are subject to 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...

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