LM76002: Large output capacitor

David Dean

Part Number: LM76002

I am looking at the LM76002 and I see the note in datasheet section 8.2.2.6 about limiting Cout to 1000uF. I have a 2200uF electrolytic capacitor that will be connected to the output. Might this cause problems?

over 3 years ago

0 Daniel Li14 over 3 years ago

TI__Mastermind 27030 points

cause the internal compensation is fixed, so the cross frequency will be low cause the load pole frequency is very low.

please also pay attention to the output current. It will equal to Cout*Vout/tss, tss is softstart time, too fast softstart time will make the current hit the OCP threshold. make sure the inductor is proper choosen in OCP condition.

Thanks

0 David Dean over 3 years ago in reply to Daniel Li14

Expert 2305 points

My control theory is rusty enough that I'm not sure exactly what that means in practice. Will the 2200uF output capacitor be OK or not?

Yes, I would set the soft start time so that it would not trip OCP during startup.

0 Daniel Li14 over 3 years ago in reply to David Dean

TI__Mastermind 27030 points

Hi David:

it is OK for 2200uF.

Thanks

Daniel Li

Power management

Power management forum

LM76002: Large output capacitor