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TPS54540 / Input timing of external SYNC signal

Other Parts Discussed in Thread: TPS54540

Hi Everyone,

Now our customer plan to use synchronized operation at TPS54540. Then please let me know the recommended input timing of external SYNC signal. Can you recommend to input external SYNC signal before power up? They are concerning that unexpected operation at transition from the resistor mode to the PLL mode though the duration may be very short within 78usec.

Best Regards,

Sonoki / Japan Disty