current limiting doesn't work
short circuit protection works when stepup is used but on lower load the non linear operation time of the P-FET is too long and leds to overheating of the FET
an NCP303 is implemented as delay for current limit checking
3.9kOhm as Rlimit and 1uF as Delay cap is used
prototype implementation:
- NCP303 placed above U4 with Pin 3 connected to the GND-side of R32
- connect pin 1 to pad 5 of U4 (!LNB_OC)
- lift pin 5 of U4 and connect pin 5 of U4 to pin 2 with 3.9 kOhm in series
- connect +3V3 @ C34 to pin 2 with 3.9kOhm in series
- connect 1µF capacitor to the GND-side of R32 and Pin 5