Very good information as always. I have a car battery charger with the same IC so this is even more valuable information for me. It failed once and it was a shorted MOSFET blowing the fuse.
Salam, interesting video, i was waiting to see a shorted component, but surprisingly, an open resistor created that shorted-like situation with the mosfet. Thank you for the explanations ! Excellent, as usual. Salam aleikum.
wa alaikum salaam dear brother yes brother when a resistor is open circuit, it creates floating gate, and the floating gate causes to switch the mosfet channel
As always I learn much from you. The use of the cigarette lighter to help break the plastic bond is nice. My experience is applying force via a chisel to the corners to fracture the plastic bond. Thank you, again.
❤ to your technical videos and extreme knowledge of Electronics step by step. You are a good 👍 Instructor. Please I request you to tell us about your Multi meter you now using in your lectures and from where I can get ! Thanks.
best regards i think it is material failure, and it is the biggest issue in this SMD material. sometimes, its resistance is increased and in rare cases it becomes open circuit
best regards you can compromise with capacitance. if that circuit have PFC circuit, that the DC rail voltage will around 400 - 410 VDC. which can cause to damage the capacitor at any time if your circuit don't have PFC, and it is working on simple bridge rectifier, in that case you can use 400VDC capacitor
selamun aleykum brother. I have an smps circuit, pwm IC KA5M0380R. The zener diode connected to the FB pin of this pwm IC is burned. How can I find the voltage value of this diode. The voltage of the FB pin is 24 volts, I think, should I use a diode that will transmit after 24 volts. Thanks...
most of time this problem when MOSFET is short cirucited or SMPS controller IC is damaged. (in this situation, every component looks good in cod testing but when the power is applied, the SMPS controller saturates the power mosfet )
Hi sir....namaskaar. How can I reduce an SMPS maximum output current without any change in output voltage. Thank you for sharing this video. Good night 🙏
The faulty resistor was in series with the gate of the MOSFET . The resistor went open circuit . The MOSFET gate was then also open circuit - it was floating . This resulted in the MOSFET being on all the time .
It is pull down resistor. It's job is to discharge tiny capacitor in the gate of the mosfet. Since mosfet works with field effect, no current is flowing through gate when mosfet is turning on, so it needs a pull down resistor or the mosfet won't switch off.
