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LMZM33603EVM: About Synchronization switching jitter

Part Number: LMZM33603EVM
Other Parts Discussed in Thread: LMZM33603, LMZM33606


Customers are evaluating LMZM33603 using EVM.
There is question about the evaluation results.

Evaluation condition is :
Vin=24V, Vout=5V, Synchronization input : 400kHz(High=5V, Low=0V)

The synchronous frequency of 400 kHz was able to operate normally.
However, switching jitter is large.

Oscilloscope measurement result of envelope mode was 50 nsec.
Customers want to reduce to jitter.
Could you tell me how to improve jitter?

Best Regards,