libyantiger
Member level 5
frustration tons of it
i have managed to troubleshoot and confirm that smps have bad uc3845....after ordering one the smps wont work
i have noticed after powering the chip up using external power supply that it will start working when vcc is 8.7vdc
now when i tetsted the start-up voltage i find it to be a 8.4vdc ...i dont know what to do to push it up
it is resistor +capacitor startup circuit so i dont think reducing the start-up resistor will make differenece any ideas?
watch this video of my us3845 testing ...the audio is low but you will manage to hear if you download it
https://www.youtube.com/watch?v=KnRfrD2BtS0&t=8s
i have managed to troubleshoot and confirm that smps have bad uc3845....after ordering one the smps wont work
i have noticed after powering the chip up using external power supply that it will start working when vcc is 8.7vdc
now when i tetsted the start-up voltage i find it to be a 8.4vdc ...i dont know what to do to push it up
it is resistor +capacitor startup circuit so i dont think reducing the start-up resistor will make differenece any ideas?
watch this video of my us3845 testing ...the audio is low but you will manage to hear if you download it
https://www.youtube.com/watch?v=KnRfrD2BtS0&t=8s