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Test Procedure

applied.

2. Connect a voltmeter V2 at TP8 (Vout) and TP9 (PGND) to measure the output voltage.

4.2.4 Other Connections

Place a fan as shown in Figure 3 and turn it on, making sure that air is flowing across the EVM.

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 jumper provided in the EVM to short J4 is on before Vin is applied.

3. Ensure that the jumper provided in the EVM to short pin 2 and pin 3 of J3 is on before Vin is applied.

4. Increase Vin from 0 V to 12 V. Use V1 to measure the input voltage.

5. Remove the jumper on J4 to enable the controller.

6. Vary the load from 0 Adc to 20 Adc. Vout must remain in load regulation.

7. Vary Vin from 8 V to 14 V. Vout must remain in line regulation.

8. Put the jumper on J4 to disable the controller.

9. Decrease the load to 0 A.

10. Decrease Vin to 0 V.

5.2 List of Test Points

Table 2. The Functions of Each Test Points

Test Points Name Description

TP1 EN Enable

TP2 PGOOD Power Good

TP3 GND GND

TP4 PGND PGND

TP5 SW Switching node

TP6 Vin Vin

TP7 PGND GND for Vin

TP8 Vout Vout

TP9 PGND PGND

5.3 Equipment Shutdown

1. Shut down the load.

2. Shut down Vin.

3. Shut down the fan.

6 Performance Data and Typical Characteristic Curves

Figure 4 through Figure 12 present typical performance curves for the TPS51218EVM.

SLVU346–January 2010 Using the TPS51218EVM-496 High-Performance, Single Synchronous,

Step–Down Controller for High-Current, Eco-mode™ Applications

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