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Test Procedure

6 Test Procedure

Set up the EVM based on Figure 2.

CAUTION

High voltage and high temperature present when the EVM is in operation!

6.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Connect the ammeter A1 (0 A to 10 A range) between DC Source and J1 as shown in Figure 2.

2. Prior to connecting the DC source, it is advisable to limit the source current to 4 A maximum. Make

sure the DC source is initially set to 0 V and connected to J1 and A1 as shown in Figure 2.

3. Connect voltmeter, V1 across the DC source as shown in Figure 2.

4. Connect Load1 to J2 as shown in Figure 2. Set Load1 to constant current mode to sink 0 A

before

the input voltage on J1 is applied.

5. Connect voltmeter, V2 to J2 as shown in Figure 2.

6. Turn on the ventilation fan making sure to blow air directly on the EVM.

7. Set switch S1 to position B.

8. Increase the DC source voltage from 0 V to 36.0 V

9. Measure VOUT (V2), IOUT, VIN (V1) and I

(A1).

10. Vary LOAD1 from 0 A to a higher value, up to 30 A

11. Increase input voltage to a different value, up to 72 V, and repeat 9 and 10.

6.2 Equipment Shutdown

1. Decrease Load-1 to 0 A.

2. Decrease VIN to 0 V.

3. Shut down VIN and the fan.

4. Shut down the load.

SLUU863–February 2012 Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V

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