LM5050-1-Q1: Paralleling for higher current

Stas Shamanin

Intellectual 450 points

Part Number: LM5050-1-Q1

Tool/software:

Hi!

I have 200A application, I want to put 10 MOSFETs in parallel.

Should I drive all 10 MOSFETs from one LM5050

Or it is better to parallel whole LM5050 solution?

I have noisy environment with transients, that may trigger LM5050 off

Mosfet is 200nC total gate charge, I see current for gate specified like 30uA.

As I understand it will take around 10ms to turn on MOSFET

If I parallel 10 mosfets, it will take like 100ms to turn it back.

What do you think?

Stas

over 1 year ago

0 Shiven Dhir over 1 year ago

TI__Mastermind 48265 points

Hi Stas,

Yes the turn-on time will be high with higher number of FETs. Paralleling multiple LM5050 can also be challenging as all of them need to have same path impedance to share similar currents. It is better to run more FETs on same controller.

Regards,

Shiven Dhir

0 Stas Shamanin over 1 year ago in reply to Shiven Dhir

Intellectual 450 points

My basic concern is that periodic transient may trigger turn off MOSFET and later it will take (according to calculations) like 100ms to turn on back.

But if transient is periodical like 10 times a second, it will trigger almost always turn off, that will lead to ideal diode be regular in-mosfet-diode.

Or I am overthinking and in real world this solution should work fine?

0 Shiven Dhir over 1 year ago in reply to Stas Shamanin

TI__Mastermind 48265 points

We can take care of false turn-off by adding an RC from IN to OUT, although this will effect the reverse current blocking response time in real RCB situation as well.

Regards,

Shiven Dhir