LRC-LRF2010-01-R010-F datasheet(2/12 Pages) TI

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Powering and Loading Considerations

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Powering and Loading Considerations

Read this entire section prior to attempting to power the evaluation board.

2.1

Quick Setup Procedure

Step 1: Set the power supply current limit to 10A. Turn off the power supply. Connect the power supply to

the V

IN terminals.

Step 2: Connect the load, with a 5A capability, to the V

OUT terminals. The positive connection goes to P3

and negative connection to P4.

Step 3: The EN pin should be left open for normal operation.

Step 4: Set V

IN to 48V with no load applied. VOUT should be in regulation with a nominal 12V output.

Step 5: Slowly increase the load while monitoring the output voltage, V

OUT should remain in regulation with

a nominal 12V output as the load is increased up to 5 Amps.

Step 6: Slowly sweep the input voltage from 15V to 80V, V

OUT should remain in regulation with a nominal

12V output.

Step 7: Temporarily short the EN pin to GND to check the shutdown function.

Step 8: Increase the load beyond the normal range to check current limiting. Hiccup mode current limit is

used for protection. The peak short circuit current is limited to approximately 11A. Cooling is critical during

this step.

2.2

Air Flow

Prolonged operation with high input voltage at full power will cause the MOSFETs to overheat. A stand-

alone fan with at least 200 LFM should always be provided.

Figure 3. Temperature Rise at 48V

IN with

Figure 4. Temperature Rise at 48V

IN with

10 µH Gowanda Inductor

10 µH Pulse Inductor

AN-1713 LM5116-12 Evaluation Board

SNVA285A – October 2007 – Revised April 2013

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