LM34936: LM34936

user5301715

Prodigy 30 points

Part Number: LM34936

our system is:

input 12V, 2ch output 24V

first powered-on without load, it works good.

But, with load (around above 24'V/3A) , it doesn't work.

over 3 years ago

0 Youhao Xi over 3 years ago

TI__Guru 68495 points

Hi User,

Thank you for using the LM34936. Could you show us your schematic?

Thanks,

Youhao Xi, Applications Engineering

0 user5301715 over 3 years ago in reply to Youhao Xi

Prodigy 30 points

here is schematic..

0 Garrett Roecker over 3 years ago in reply to user5301715

TI__Mastermind 21720 points

Hello User5301715,

It looks like the control loop compensation needs to change to ensure stable operation at when the output current is 3A. I suggest changing the following part values.

R51 = 1.78kOhm

C49= 56nF

C52 = 2.7nF

Please let me know if you have any questions.

Thanks,

Garrett

0 Youhao Xi over 3 years ago in reply to Garrett Roecker

TI__Guru 68495 points

Hello User,

Can we assume the issue is resolved? Let me close this thread here, but you are welcome to reopen it by adding a new post.

Good luck in your project!

Thanks,

Youhao

0 user5301715 over 3 years ago in reply to Youhao Xi

Prodigy 30 points

hello..

i am sorry for the late reply.

i have another issue.

anyway, i resolved issue by adopt below :

added 39uF and 82uF Elec cap (35SVPF series, panasonic)

but i still don't test your suggestion.. sorry again.

i will try it later.

Thanks.

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LM34936: LM34936