Texas Instruments Evaluation Module for TPS51217 20A Synchronous Step Down Controller with DCAP™ Mode TPS51217EVM-533 TPS51217EVM-533 データシート
製品コード
TPS51217EVM-533
Test Procedure
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5
Test Procedure
5.1
Line/Load Regulation and Efficiency Measurement Procedure
1. Ensure that the load is set to constant resistance mode and to sink 0 Adc.
2. Ensure that the SW1 switch on the EVM is at OFF position before VIN and V5IN are applied.
3. Increase VIN from 0 V to 8 V, using V1 to measure input voltage.
4. Increase V5IN from 0 V to 5, using V2 to measure input voltage.
5. Turn the SW1 switch to the ON position to enable the controller.
6. Input 0 V or 3.3 V (DC) to VID0 and VID1 to select V
2. Ensure that the SW1 switch on the EVM is at OFF position before VIN and V5IN are applied.
3. Increase VIN from 0 V to 8 V, using V1 to measure input voltage.
4. Increase V5IN from 0 V to 5, using V2 to measure input voltage.
5. Turn the SW1 switch to the ON position to enable the controller.
6. Input 0 V or 3.3 V (DC) to VID0 and VID1 to select V
OUT
among 0.9 V, 1.0 V, 1.1 V and 1.2 V.
7. Vary load from between 0 Adc to 20 Adc, V
OUT
should remain in load regulation.
8. Vary VIN from between 8 V and 20 V, V
OUT
should remain in line regulation.
9. Decrease the load to 0 A.
10. Input 0 V to VID0 and VID1.
11. Turn the SW1 switch to the OFF position to disable the controller.
12. Decrease V5IN to 0 V.
13. Decrease VIN to 0 V.
10. Input 0 V to VID0 and VID1.
11. Turn the SW1 switch to the OFF position to disable the controller.
12. Decrease V5IN to 0 V.
13. Decrease VIN to 0 V.
5.2
Dynamic Output Voltage Transition Measurement Procedure
1. Follow steps 1 to 5 of Line/Load Regulation and Efficiency Measurement Procedure.
2. Ensure pulse configuration is Return-to-Zero (RZ) with 50% duty ratio.
3. Run the pulse generator. V
2. Ensure pulse configuration is Return-to-Zero (RZ) with 50% duty ratio.
3. Run the pulse generator. V
OUT
steps down from 1.2 V to 0.9 V as shown in
.
4. Stop the pulse generator. Change the configuration as inverted.
5. Run the pulse generator again. V
5. Run the pulse generator again. V
OUT
steps up from 0.9 V to 1.2 V as shown in
6. Stop the pulse generator.
7. Follow steps 11 to 13 of Line/Load Regulation and Efficiency Measurement Procedure.
7. Follow steps 11 to 13 of Line/Load Regulation and Efficiency Measurement Procedure.
5.3
Equipment Shutdown
1. Shut down load.
2. Shut down pulse generator.
3. Shut down V5IN.
4. Shut down VIN.
5. Shut down FAN.
2. Shut down pulse generator.
3. Shut down V5IN.
4. Shut down VIN.
5. Shut down FAN.
8
Using the TPS51217EVM-533, High-Performance, Single-Synchronous
SLUU420 – MAY 2010
Step-Down Controller for Notebook Power Supply
Copyright © 2010, Texas Instruments Incorporated