Maximum Power For Design

Posted by: Mike Tignor on 06/19/2012

I think I am running into a maximum power problem. My design chooses a TOP271. But still indicates a "Peak primary current exceeds device current limit". My single output design is set to 48 VDC and 5 Amps. I have tried using peak loads setting but this was no help. So I think my question is " How do I handle 250 Watt design?" thanks, Mike

Comments

Hi Mike

I tried running your design and ran into no trouble. I assume you are not trying to do an universal design (it won't be able to deliver that amount of power as per datasheet specification).

Let me know your full spec please. I may be able to help you further.

One additional note: with that type of output: the TL431 may exceed the absolute maximum voltage between cathode and anode. I recommend a zener feedback.

Cheers,

Wesley

Wesley:

Thanks for the reply.

We would like a universal input. But I think this causes the device current to exceed ratings.

The output requirements are 48 VDC @ 5 Amps. This is not continuous. The nominal current may be only 2 amps with surge (less than 20% duty cycle) to 5 amps.

I want to know if there is a way to do this with PI part or should I use something that has external MOSFET?

Mike

sent you a pm