Hacked_27
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Hello all!
I am designing flyback converter with input 12v (car battery) to two outputs of 5V and 1A per output, basicly car cell phone charger.
I chose LTC3803 controller and first make simulations in LT spice, and all goes well with perfect coupling but when i include leakage inductance voltage drops are big, on full load voltage drops to 4V. i regulate feedback from third winding so that my two outputs are completely isolated, third winding also supply current to chip. i am posting dropbox link to my schematic.
i will be using off shelf transformer VP5-0083-R. on datasheet it states it has 0.105uH leakage inductance, my primary inductance is 21.2uH so 0.995 is coupling factor if i am correct?
Any tips for better cross regulation are welcome.
I am designing flyback converter with input 12v (car battery) to two outputs of 5V and 1A per output, basicly car cell phone charger.
I chose LTC3803 controller and first make simulations in LT spice, and all goes well with perfect coupling but when i include leakage inductance voltage drops are big, on full load voltage drops to 4V. i regulate feedback from third winding so that my two outputs are completely isolated, third winding also supply current to chip. i am posting dropbox link to my schematic.
i will be using off shelf transformer VP5-0083-R. on datasheet it states it has 0.105uH leakage inductance, my primary inductance is 21.2uH so 0.995 is coupling factor if i am correct?
Any tips for better cross regulation are welcome.
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