Datasheet

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Configurations

5 Configurations

Make all Switcher selections before applying power to the EVM. Configure this EVM per the following:

Enable1 Selection

The EN1 pin can be set by S1.

Default setting: S1 to OFF to disable the Output1

Table 2. EN1 Selection

Switcher set to SKIPSEL Selection

ON Enable the Output1

OFF Disable the Output1

Enable2 Selection

Default setting: S2 to OFF to disable the Output2

Table 3. EN2 Selection

Switcher set to Enable Selection

ON Enable the Output2

OFF Disable the Output2

6 Test Procedure

6.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Set up the EVM as described in Section 4 and Figure 3

2. Ensure Load1 and Load2 are set to constant resistance mode and to sink 0 Adc

3. Ensure the configuration settings per Section 5

4. Ensure S1 and S2 are in the OFF position before Vin is applied

5. Increase Vin from 0 V to 12 V. Using V1 to measure input voltage

6. Switch S1 to the ON position to enable the Output1

7. Use V2 to measure Vout1 voltage

8. Vary Load1 from 0–10 Adc, Vout1 should remain in load regulation

9. Vary Vin from 8 V to 20 V, Vout1 should remain in line regulation

10. Switch S1 to the OFF position to disable the Output1

11. Switch S2 to the ON position to enable the Output2

12. Use V3 to measure Vout2 voltage

13. Vary Load2 from 0–10 Adc, Vout2 should remain in load regulation

14. Vary Vin from 8 V to 20 V, Vout2 should remain in line regulation

15. Switch S2 to the OFF position to disable the Output2

16. Decrease Load1 and Load2 to 0 A

17. Decrease Vin to 0 V

SLVU735–June 2012 Dual Synchronous Step-Down Fixed Output Controller with 5-V and 3.3-V

LDOs

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