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Texas Instruments TPS54291EVM-431 Скачать руководство пользователя страница 9

TP4 /
TP19

TP3 /
TP18

Metal Ground Barrel

Probe Tip

Tip and Barrel Vout ripple

measurement

Network

Analyzer

Isolation

Transformer

FAN

V1

+

-

A1

-

+

V

VIN

LOAD1

3.3V @

1.5A

-

+

V2

+

-

LOAD2

1.2V @

2.5A

+

-

V3

-

+

www.ti.com

Test Set UP

Figure 3. Output Ripple Measurement – Tip and Barrel using TP3 and TP4 or TP18 and TP19

Figure 4. Control Loop Measurement Setup

4.3

Start Up / Shut Down Procedure

1. Increase V

IN

from 0V to 12Vdc

9

SLVU356 – January 2010

Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and 1.2V 2.5A

Synchronous Buck Converter

Submit Documentation Feedback

Copyright © 2010, Texas Instruments Incorporated

Содержание TPS54291EVM-431

Страница 1: ...erials 16 List of Figures 1 TPS54291EVM 431 Schematic For Reference Only See Table 4 Bill of Materials for Specific Values 4 2 TPS54291EVM 431 Recommended Test Set Up 8 3 Output Ripple Measurement Tip...

Страница 2: ...mance of the TPS54291 in a given application The EVM can be modified to other output voltages by changing some of the components 1 2 Applications Non Isolated Point of Load and Voltage bus converters...

Страница 3: ...5 V Line Regulation VIN Min to Max 1 Load Regulation IOUT Min to Max 1 VOUT_ripple Output Voltage Ripple VIN Nom IOUT Max 50 mVpp IOUT1 Output Current 1 VIN Min to Max 0 2 5 A IOUT2 Output Current 2 V...

Страница 4: ...matic For Reference Only See Table 4 Bill of Materials for Specific Values 4 Using the TPS54291EVM 431 A 12V Input 3 3V 1 5A and 1 2V 2 5A SLVU356 January 2010 Synchronous Buck Converter Submit Docume...

Страница 5: ...for VOUT2 Channel A Loop Monitoring 3 3 7 TP16 CHB VOUT2 Channel B for Loop Monitoring 3 3 7 TP17 GND Ground for VOUT2 Channel B Loop Monitoring 3 3 7 TP18 VOUT2 Monitor VOUT2 Voltage 3 3 8 TP19 GND G...

Страница 6: ...291EVM 431 contains a 51 series resistor R13 in the feedback loop to allow for matched impedance signal injection into the feedback for loop response analysis An isolation transformer should be used t...

Страница 7: ...and LOAD1 can carry as much as 1 5Adc 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...

Страница 8: ...stant current mode to sink 0Adc before VIN is applied 6 Connect voltmeter V2 across TP3 and TP4 as shown in Figure 2 7 Connect LOAD2 to J3 as shown in Figure 2 Set LOAD2 to constant current mode to si...

Страница 9: ...Test Set UP Figure 3 Output Ripple Measurement Tip and Barrel using TP3 and TP4 or TP18 and TP19 Figure 4 Control Loop Measurement Setup 4 3 Start Up Shut Down Procedure 1 Increase VIN from 0V to 12Vd...

Страница 10: ...el A and Channel B to TP5 and TP7 as shown in Figure 4 5 Inject 30mV or less signal across R1 through Isolation Transformer 6 Sweep Frequency from 1kHz to 1MHz with 10Hz or lower post filter 7 Control...

Страница 11: ...nt A LOAD 14 V 12 V 2 5 12 V 14 V 8 V www ti com TPS54291EVM 431 Typical Performance Data and Characteristic Curves 5 1 Efficiency VIN 9 6 13 2V VOUT1 3 3V IOUT1 0 1 5A VOUT2 1 2V IOUT2 0 2 5A Figure...

Страница 12: ...3 0 with all components in a 0 86 1 28 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 TPS54291 control IC in a...

Страница 13: ...Silkscreen Viewed from Top Figure 10 TPS54291EVM 431 Top Copper Viewed from Top 13 SLVU356 January 2010 Using the TPS54291EVM 431 A 12V Input 3 3V 1 5A and 1 2V 2 5A Synchronous Buck Converter Submit...

Страница 14: ...m Copper X Ray View from Top Figure 12 TPS54291EVM 431 Internal 1 X Ray View from Top 14 Using the TPS54291EVM 431 A 12V Input 3 3V 1 5A and 1 2V 2 5A SLVU356 January 2010 Synchronous Buck Converter S...

Страница 15: ...igure 13 TPS54291EVM 431 Internal 2 X Ray View from Top 15 SLVU356 January 2010 Using the TPS54291EVM 431 A 12V Input 3 3V 1 5A and 1 2V 2 5A Synchronous Buck Converter Submit Documentation Feedback C...

Страница 16: ...4 38A 20 m 0 402 x 0 394 inch MSS1048 822L Coilcraft 1 L2 3 3 H Inductor SMT 4 38A 20 m 0 402 x 0 394 inch MSS1048 332L Coilcraft 2 R1 R8 51 Resistor Chip 1 16W 5 0603 Std Std 1 R10 40 2 k Resistor C...

Страница 17: ...h statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury...

Страница 18: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments TPS54291EVM 431...

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