LM5155-Q1: what happen if LM5155-Q1 FB open?

Hangjie Wang

Intellectual 1620 points

Part Number: LM5155-Q1
Other Parts Discussed in Thread: LM5155

Hi expert,

Could you pls help share what happen if the LM5155 FB open at Sepic circuit? and pls provide the Pin FMEA doc, thanks.

BR,

Hangjie

4 months ago

0 Moritz 4 months ago

TI__Mastermind 26975 points

Hi Hangie,

When FB is floating, its difficult to say what will happen. The worst case will be that there is 0V at FB and the duty cycle will increase to the maximum.

Then the output voltage will run away. I have to check if we can provide a pin FMEA.

Best regards

Moritz

0 Hangjie Wang 4 months ago in reply to Moritz

TI__Intellectual 1620 points

Hi Moritz,

thanks for that, pls help share the Pin FMEA doc once you get.

BR,

Hangjie

0 Moritz 4 months ago in reply to Hangjie Wang

TI__Mastermind 26975 points

Hi Hangie,

Sure, i will share it as soon as possible.

Best regards

Moritz

Simulation, hardware & system design tools

Simulation, hardware & system design tools forum

LM5155-Q1: what happen if LM5155-Q1 FB open?