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LM5160A: Vcc supply by VOUT(PRI)

Part Number: LM5160A

Dear Team,

My customer is planing to use VOUT(PRI) to provide power to VCC pin.

Is there any concern here?  

Will the load not enough, cause output unstable?

Besides, they will design Vout(pri)=10V, Vout(sec)=5.6V.

What is the suggested dummy load resister for Vout(sec)?

As the datasheet use 2kohm on the page 26.

How to calculate it?

BR

Kevin