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10W design Heating problem

Posted by: Hardik Dhameliya on

Hi,

I have desgined 10W supply using Linkswitch-HP(LNK6663VG) .Enclosed is the schematic for the same.

Supply working perfectly for low load and tempreture stays within acceptable limit.But when operated at full load, Tempreture of certain components like diode SB340(D1),Region near to R6,R5,R2,C6 reaches to 100'C and above. Kindly suggest any solution to reduce tempreture.

 

Reagrds,

Hardik Dhameliya

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Comments

Submitted by PI-Sarek on 05/21/2015

Hi,

It appears from your description that the primary side clamp circuit components are overheating. This suggests that the leakage reactance of the transformer is high. Kindly verify transformer construction and measure the leakage reactance and compare with the estimated values shown in the PIXls/PIExpert design which you can make using our freely downloadable tool called the PIExpert.

Thanks and Regards,

PI-Sarek