UC3825BN driving mosfets of push pull converter

Abhinand Dhanakshirur

Other Parts Discussed in Thread: TL494

Hello
I am using uc3825bn for driving mosfets of push pull converter. When I tried and tested (on bread board) the open loop configuration given in the datasheet, I got perfect outputs on the pins 11 and 14 with desired dead time between them. But on many occasions the outputs on this pins weren’t stable the disappeared without any reason. Also I used polyester capacitors rather than ceramic since they have steady capacitance. And when I interfaced it to power circuit the all the waveforms were distorted including the PWM pulses from pins 11 and 14. Can anybody help me in this regard as what needs to be done?
Thank you.

over 14 years ago

0 Hong Huang over 13 years ago

TI__Guru 73005 points

When you say "bread board", do you mean a bread board or a prototype board. If you do mean "bread board" such as sometimes called vector board to connect while not slodered on, issues described like in your message could happen.

0 Abhinand Dhanakshirur over 13 years ago in reply to Hong Huang

Prodigy 195 points

Hello

Yes by bread board i mean a board with unsoldered connections.. And also i tried with soldered connections using general purpose PCB, i encountered the same problems.

But anyway i wrapped up the issue using a TL494 IC..

Thank You.

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UC3825BN driving mosfets of push pull converter