mxlemming
100 kW
- Joined
- Jul 17, 2020
- Messages
- 1,120
I'm really not sure why I'm doing this so it'll get kicked to the wayside first of all my projects.
Inspired by zombiess DCDC thing, I decided to quickly lay out a DCDC controlled by an stm32 (literally the cheapest stm32 made) and an ir2184 gate driver with external FETs. I got 5 of them from jlcpcb fully built for 60usd.
The concept is to use the 12V output to feed the gate driver and MCU via a regulator, with a push to start few kohm resistor and 12V Zener diode to kick it off.
Well here it is, 20x40mm and might one day be capable of 4A.
So far I was initially very pleased that it programmed and can read all the voltages and currents and do pwm and hit all the interrupts... then I found the kick start circuit can barely power the MCU and realized that the gate driver cannot be used in discontinuous conduction mode because it needs time to charge the bootstrap cap.
This thing is going to be a pain in the arse. Why am I doing this.
Inspired by zombiess DCDC thing, I decided to quickly lay out a DCDC controlled by an stm32 (literally the cheapest stm32 made) and an ir2184 gate driver with external FETs. I got 5 of them from jlcpcb fully built for 60usd.
The concept is to use the 12V output to feed the gate driver and MCU via a regulator, with a push to start few kohm resistor and 12V Zener diode to kick it off.
Well here it is, 20x40mm and might one day be capable of 4A.
So far I was initially very pleased that it programmed and can read all the voltages and currents and do pwm and hit all the interrupts... then I found the kick start circuit can barely power the MCU and realized that the gate driver cannot be used in discontinuous conduction mode because it needs time to charge the bootstrap cap.
This thing is going to be a pain in the arse. Why am I doing this.