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ISSUE IN DESIGN USING TOP 249 YN

Posted by: SUSHIL on

Dear PI ,

 

We are facing problem in designing  of TOP 249/247  YN  ,In which we getting 48 V /150w supply, but the issue is that after  the load of even 2A the TOP switch is too  hot  and thermal shut down the switch,Pls help.

Comments

Submitted by PI-Surak on 07/19/2012

TOP249 is intended for off-line universal input where the minimum DC input voltage is around 100 V. At 48V the RMS switch current will be much higher so it is not surprising that device is so hot. We do not have a device that can deliver 150 watts at such a low input voltage.