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problem with thermal shutdown

Posted by: vp_isp on
Hello I have a problem with the temperature shutdown. When we have a load on my circuit and when the temperature of the TOP250 is about 40 deg C the TOP shutdown itself. when we put a fan on TOP we don't have this problem. But I don't think so that 40 deg is a high temperature for it. we designed our circuit with PI Expert 6.6 and 7. We designed 3 circuits with TOP250 : 48V , 5.2A 30V , 3A 12V , 10A every 3 circuits had this problem. Please help me. Thank you so much for your supports.

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Submitted by prasun on 09/01/2008
hello,kindly attach the schematic & transformer details. what is the transformer tempreture?under what conditions & method you are testing tempreture. also which instrument u r using to test.also, pls do check, what is the maximum operating load current it withstand without thermal s/d. mail me at prasunkuls@hotmail.com
Submitted by PI-Chekov on 09/02/2008

40 C is very low for thermal shutdown. Where are you measuring the temperature - the plastic or metal tab? The lowest you should see measuring the tab is 130 C (there's a small temperature delta between tab and die).

Cheers

PI-Chekov