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LM5175 frequency setting

Other Parts Discussed in Thread: LM5175

Hi

Our key customer evaluate LM5175 on TI-EVM which may be prototype.

They found some strange phenomenon. That is 

1. The frequency become 257kHz when the resistor of RT pin set 47kohm.

2. The abnormal operation occur when the external sync clock is 350kHz.

It is normal operation when the external clock is 305kHz.

Is there any problem on this EVM or sample.

Regards,

Koji Hamamoto