STR-W6000S power IC

..... Phil

esistor to pin 3 of the ic is burnt beyond recognition. l tried to find out from the manufacturers data sheet but all the application circuits there h ave no value marked on the resistors. can anyone give a typical value or ho w to figure out this value?

Thanks l have changed the ic and try that value too

The reference design for that chip shows a 0.27 ohm/1W resistor. Select a low inductance type such as a carbon composition resistor here... definitely not a wirewound type.

Cheers, Dave M

snipped-for-privacy@yahoo.com wrote:

You definitely should spec a low inductance type for the source resistor at these freq, but even certain carbon comps are supposedly trimmed in a spiral pattern making them inductive..

There are non inductive types available but they're tough to find. Still, I'd try any resistor before a wirewound in this app.

And beware, there are some wire wound types that look *exactly* like metal film ones.

I was fooled by this once and the PSU would not start up normally.

.... Phil