Aether32
Newbie level 2
Greetings,
I am working on a flyback smps.
Currently I am having a problem with the mosfet switching, the mosfet itself won't mirror the drive
signal from the PWM controller, only a distorted pulse appear. I am sure the PWM controller is able
to drive the mosfet without a problem as the input capacitance of the mosfet is max. 750 pF and
the allowed capacitance for the PWM controller is 1 nF.
Input from mains: 230~ V AC -> 325~ DC
Switching frequency: 450 KHz
output voltage: 19 V
output current max.: 4.74 A
parts:
PWM controller: UC3842
Mosfet: 2SK2700
The PWM controller receives power from an external power supply.
Circuit schematic and signal captures from the circuit are attached.
Any pointers are welcome
I am working on a flyback smps.
Currently I am having a problem with the mosfet switching, the mosfet itself won't mirror the drive
signal from the PWM controller, only a distorted pulse appear. I am sure the PWM controller is able
to drive the mosfet without a problem as the input capacitance of the mosfet is max. 750 pF and
the allowed capacitance for the PWM controller is 1 nF.
Input from mains: 230~ V AC -> 325~ DC
Switching frequency: 450 KHz
output voltage: 19 V
output current max.: 4.74 A
parts:
PWM controller: UC3842
Mosfet: 2SK2700
The PWM controller receives power from an external power supply.
Circuit schematic and signal captures from the circuit are attached.
Any pointers are welcome