LM3481-Q1: What's the function of the circuit highlighted in the red circle?

Ted Zhang

Part Number: LM3481-Q1

Hi,

The schematic is from the LM3481-Q1 flyback-EVM. Can you please help with the circuit function that I highlight in the red circle please? Many thanks!

over 7 years ago

0 Garrett Roecker over 7 years ago

TI__Mastermind 21720 points

Hi Ted,

This is secondary side soft-start. It will slowly ramp the reference voltage up during start-up.

Thanks,

Garrett

0 Ted Zhang over 7 years ago in reply to Garrett Roecker

TI__Intellectual 2280 points

Hello Garrett,

Thanks for your reply, can you please help to elaborate on how this circuit works? Thanks!

Power management

Power management forum

LM3481-Q1: What's the function of the circuit highlighted in the red circle?