LM5576 fail to start

alain jeanneaux1

Hello,

I designed a PSU 48V to 24V.

I get a 24V pulse which decay and repeat as soon as the output voltage is down.

Any idea??

0 Frank De Stasi over 11 years ago

How much load are you using? Send some plots of switch boot and vout.

0 alain jeanneaux1 over 11 years ago in reply to Frank De Stasi

when I had this problem, very small load, just one LED to see if it work.

I increased load to over .3A and it works.

How to set the minimum load, I would like it to start with no or very light load if possible

Thank you for help

Alain

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