Powering and Loading Considerations

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2.5

Synchronization

A SYNC pin has been provided on the evaluation board. This pin can be used to synchronize the regulator

to an external clock. For complete information, see LM5116 Wide Range Synchronous Buck Controller

(SNVS499).

Figure 8. Synchronization at 48V

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2.6

Active Loads

Figure 9 shows a typical start-up characteristic into a constant current active load. This type of load can

exhibit an initial short circuit, which is sustained well beyond the duration of the fault timer. Increasing the

soft-start time improves the ability to start into this type of load. For the extreme case, the hiccup fault

timer may be disabled by removing C7. A sustained short circuit should be avoided when the fault timer is

not used.

Figure 9. Start-up into Active Load at 48V

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4

AN-1713 LM5116-12 Evaluation Board

SNVA285A – October 2007 – Revised April 2013

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