TOPSwitch-24-12-109W

Posted by: aminmohajerani on 08/11/2013

I have got a TOP271EG to run an AC / DC Converter with 220Vac as input and 24V-4.5A and 12.5V-0.5Amp as output ,

based on information from datasheet , it would have to be able to drive 177W Maximum continuous power in a typical non-ventilated condition but when I load it above 60W - 24V-4.5Amp , switching controller goes to over temperature shutdown and reach temperature near 100C degree ,

So I want to ask how could I improve efficiency in order to prevent it from getting too hot ?

thanks .

Best Regards

Files

Attachment	Size
TOPSW.pdf	150.04 KB
TOPSwitch-24-12-109W.uds	316.5 KB
TopSwitchJX.pdf	173.87 KB

Comments

Could you upload your schematic?

Thanks

I attached Schematic file in pdf format .

thank you .

Your schematic looks good! But PI's datasheet cliams metal heatsink for the 177W continuously output power. Could you test with enough heatsink for your application?

Regards

I have measured the total efficiency and it was near 72% but it would be 85%. The output diode is more than 100 degree hot. How could I improve the efficiency at secondary “24V circuit” and in primary circuit indeed ?

PLS use schottky diode on the secondary side. For your application, it is not easy to meet your efficiency SPEC and thermal, Schottky diode can help you a a lot. Try your best to find some very good Schottky diode.

Regards