USB port in my radio car Pioneer deh 4000ub stopped working. I measured voltage between USB Vcc and GND and it's about 0V. It seems to be a problem with high side power switch (R5523N), because there is 0V on the output pin. I also checked other pins and the voltages are as followed:
- EN- there is 5V for a moment when I turn the radio on and then 0V,
- GND- 0V,
- FLG- +5V,
- VIN- +5V,
- VOUT- same as on ENABLE pin, 5V for a sec, then 0V.
I don't know whether there should be constant voltage on ENABLE pin or not, but can I just short VIN and EN to give it constant 5V? Or maybe I can omit whole high side power switch, connect USB Vcc directly to 5V wire and then be careful what devices I plug to USB port?