Datasheet

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Configurations

6 Configurations

6.1 Enable/Disable Switch S1

The TPS53015EVM-126 is equipped with a switch (S1) to drive the EN pin of the TPS53015. When S1 is

in the Enable position, EN is connected to VIN, and the TPS53015 is enabled and generates a regulated

1.05-V output. When S1 is in the Disable position, EN is connected to GND, and the TPS53015 enters a

high impedance output state.

Default setting: set S1 to the Disabled position to disable the controller

7 Test Procedure

7.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Set up EVM as described in Section 5 and Figure 3.

2. Ensure Load is set to constant resistance mode and to sink 0 A

3. Ensure the switch S1 is set per Section 6.

4. Increase VIN from 0 V to 12 V. Using V1 to measure VIN voltage.

5. Set the switch S1 to Enable position to enable the controller.

6. Use V2 to measure VOUT voltage, A1 to measure VIN current.

7. Vary load from 0-8 A

, VOUT should remain in load regulation.

8. Vary VIN from 8.0 V to 22 V, VOUT should remain in line regulation.

9. Set the switch S1 to Disable position to disable the controller.

10. Decrease load to 0 A.

11. Decrease VIN to 0 V.

7.2 List of Test Points

Table 2. Test Point Functions

TEST POINTS NAME DESCRIPTION

TP1 VIN Input voltage

TP2 GND GND

TP3 VREG5 Output of 5-V linear regulator

TP4 PG Power good

TP5 EN Enable pin

TP6 SW Switching node

TP7 VOUT Output voltage

TP8 GND GND

TP9 GND GND

TP10 GND GND

7.3 Equipment Shutdown

1. Shut down VIN.

2. Shut down Load.

3. Shut down FAN.

SLUU944–June 2012 Single Synchronous Step-Down Controller for Low-Voltage Power Rails

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