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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. Verify and confirm J3 jumper is placed across pin 2 to 1.

2. Verify switch S1 is on position A.

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

4. 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.

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

6. 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.

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

8. Connect 8.0 V 2nd Bias to J4. Turn its voltage into 8.0 V.

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

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

11. Snap switch S1 to position B.

12. Remove 8.0 V 2nd Bias.

13. Measure VOUT (V2), IOUT, VIN (V1) and Iin (A1).

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

15. Repeat step 10.

16. Increase input voltage to a different value, up to 75 V, and repeat step 10 and 11.

6.2 Equipment Shutdown

1. Decrease Load1 to 0 A.

2. Snap switch S1 to position A.

3. Decrease VIN from 75.0 V

to 0 V.

4. Shut down VIN and Fan.

5. Shut down the load.

6.3 Notes for Operating this EVM

1. This EVM relies on external auxiliary power supply (8.0 V/0.1 A) to start up. After start up, the board

can operate normally without the external auxiliary supply. If the auxiliary supply is removed, the board

cannot start up without adding the auxiliary supply back after Enable Off.

2. This EVM does not have line under voltage ON/OFF feature. Please follow 6.1 and 6.2 to turn on and

off the board. Strange behavior including damage may be observed if do not follow Section 6.1 and

Section 6.2.

3. In evaluating protection features (OVP and OCP, etc.), the external auxiliary power supply should

remain connected and setup at 8.0 V which is required to resume the EVM operation after a fault is

cleared or in order to operate in hiccup mode in that regarding.

SLUU441A– September 2010– Revised October 2011 Half-Bridge DC-to-DC Converter —With Secondary-Side Control

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