H
Hammy
- Jan 1, 1970
- 0
Anybody know of a current mode controller for flybacks with duty cycle
limitations of 45-50%,with direct opt coupler feedback?
I've been searching Digikey and Newark but all I'm finding are UC3844
types I can use this but if there is a similar one like the NCP1217A
I'd prefer this. The duty max is 50%,and can directly take an opto
feedback ( NCP1217A) unlike the UC384X series which the opto feedback
is through the EA comp pin. The NCP1217A isn't stocked at Newark.
Or is there a way to limit the duty of controllers externally? Under
normal operation my max duty won't exceed 40% but at start up and
shutdown, short cct this would be exceeded. I have several
UC3842,NCP120x CONTROLLERS on hand, so this would be ideal.
This is for a 60W 90-140VAC two switch flyback (60kHz).
limitations of 45-50%,with direct opt coupler feedback?
I've been searching Digikey and Newark but all I'm finding are UC3844
types I can use this but if there is a similar one like the NCP1217A
I'd prefer this. The duty max is 50%,and can directly take an opto
feedback ( NCP1217A) unlike the UC384X series which the opto feedback
is through the EA comp pin. The NCP1217A isn't stocked at Newark.
Or is there a way to limit the duty of controllers externally? Under
normal operation my max duty won't exceed 40% but at start up and
shutdown, short cct this would be exceeded. I have several
UC3842,NCP120x CONTROLLERS on hand, so this would be ideal.
This is for a 60W 90-140VAC two switch flyback (60kHz).