UC3825: Hi, I am using it for full bridge converter.

Skanda rama

Part Number: UC3825

Hi,

I am using it Full bridge converter configuration. Input dc is 250V to 380V. Output is variable from 0 to 200V. I am observing Only one pulse release in one of the two PWM output's for lower load or low voltage conditions(around below 10% duty cycle). I am doing external PWM compensation. I am using it only for PWM release. I am facing issue when vdc_error goes below ramp valley value(0.7V to 1.25V).Using only it for pulse release. I have attached schematic,

over 5 years ago

0 Joe Leisten over 5 years ago

TI__Expert 3095 points

Hi Skanda rama ,
Could you please send a waveform of the OUTA/B and EAOUT + RAMP and ILIM signals.
I hope with this information it should be possible to understand the issue better.
Thanks
Joe Leisten

0 Joe Leisten over 5 years ago in reply to Joe Leisten

TI__Expert 3095 points

Hi Skanda rama,
Without this additional data it is not possible for me to help so I will close this post.
If you manage to get the information please do not hesitate to open a new post.
Thanks
Joe Leisten

Power management

Power management forum

UC3825: Hi, I am using it for full bridge converter.