Datasheet

Test Procedure

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6.3 External Tracking Selection

The external tracking can be configured by J5. If jumper J5 is shorted, the internal 2-V VREF voltage is

used to set the target output voltage to be 0.75 V. If jumper J5 is open, the external reference between 1.2

V to 4.0 V can be applied to J7. The output voltage will be regulated to ½ of the external reference

voltage. For example, applying 1.35 V to J7, the output voltage is 0.675 V.

6.3.1 Default setting: No External Tracking

Table 4. External Tracking Configuration

JUMPER SET TO ExTERNAL TRACKING CONFIGURATION

Short No external tracking

Open External tracking

6.4 Enable Selection

The controller can be enabled and disabled by S1.

6.4.1 Default setting: Switch to disable the controller

Table 5. Enable Selection

SWITCH SET TO ENABLE SELECTION

DIS Disable the controller

EN Enable the controller

7 Test Procedure

7.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Set up EVM as described in Figure 3.

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

3. Ensure all jumpers and switch configuration settings per Section 6.

4. Increase V5IN from 0 V to 5 V. Using V3 to measure V5IN voltage.

5. Increase VIN from 0 V to 1.5 V. Using V1 to measure VIN voltage.

6. Set switch S1 to EN to enable the controller.

7. Use V2 to measure VOUT voltage, A1 to measure VIN current and A2 to measure V5IN supply

current.

8. Vary Load from 0 A

to 3 A

, VOUT should remain in load regulation.

9. Vary VIN from 1.4 V to 1.6 V, VOUT should remain in line regulation.

10. Set switch S1 to DIS to disable the controller.

11. Decrease Load to 0 A.

12. Decrease VIN to 0 V.

13. Decrease V5IN to 0 V.

TPS53317EVM-750 D-CAP+™ Mode Synchronous Step-Down Integrated FETs SLUU642–September 2011

Converter

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