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problem in design DC DC converter 12V - 310V
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Tankesh Rajput:
Hello,
I am trying to make DC - DC Converter using SG3525 ic. which circuit diagram i mentioned. its work perfectly when the load is under 60W, when i increase load. transformer create noisy sound and waveform of mosfet gate is change ( frequency increase and waveform is unstable). i use a ferrite core transformer which i take from computer power supply. its a EE type core which core area is 0.785 cm2. transformer calculation is on attachment. primary wire is 0.6mm *10 wire and secoundry side is 0.45mm wire *1. please tell me what changes i need to increase the output power to 350W. i use irf3205 Mosfet instead of irfz44.
schmitt trigger:
Do you know for sure, that the unknown magnetic core will sustain 1700 Gauss without saturation?
Tankesh Rajput:
I dont have datasheet of core. most of website i see that the guass value is in between of 1300G - 2000G. so i assume that its not saturate in 1700 Gauss.
Tankesh Rajput:
I also try to 3 other ferrite core with same design but problem remain same.
Tankesh Rajput:
I think that i use the wire at primary side to handle to capable to more than 60w so i try the 12mm (width) copper insulated foil instead of copper round wire. but wonderfully its increase my problem. its consume 26W power when no load is connected at output.  ;D ;D
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