bogdan2011
Member
Greetings,
I'm building a variable lab power supply and I'm trying to understand how constant current / current feedback works with PWM.
I've been looking at danyk's lab SMPS project that uses UC3845 and a current transformer. According to the block diagram of the chip, the ISENSE pin is internally connected to a PWM comparator.
So how does vary the current by varying the duty cycle BUT keep the voltage constant?
I'm building a variable lab power supply and I'm trying to understand how constant current / current feedback works with PWM.
I've been looking at danyk's lab SMPS project that uses UC3845 and a current transformer. According to the block diagram of the chip, the ISENSE pin is internally connected to a PWM comparator.
So how does vary the current by varying the duty cycle BUT keep the voltage constant?