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controlling boost using pwm from mikrokontrooler

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m4xa

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hi all

i want to control the boost conveter duy cycle using uC ATMEGA 8535
but when the duty cycle is 10 %the voltage increase
after i raise the dutycycle more than 10 % the voltage drop....

is it something wrong with my boost?? or because the frequency??
i use 3 KHz
 

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