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Test Procedure

6 Test Procedure

Set up the EVM based on Figure 2.

CAUTION

!! 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 3 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 J5 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 and TP10 as shown in Figure 2.

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

7. Set S1 to ON position, then increase the DC source voltage from 0 V to 36.0 V

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

(A1).

9. Vary LOAD1 from 0 A to a higher value, up to 23 A

10. Repeat step 8.

11. Increase input voltage to a different value, up to 72 V, and repeat step 8 and 9.

6.2 Equipment Shutdown

1. Decrease Load1 to 0 A.

2. Decrease VIN from 72.0 V

to 0 V.

3. Shut down VIN and Fan.

4. Shut down the load.

SLUU429B–June 2010–Revised December 2010 Half-Bridge DC-to-DC Converter With Primary-Side Control

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