UC3525A: PWM Ramp Voltage

Mehmet Can OCAL

Part Number: UC3525A

Hi,

I'm trying to design a full bridge dc-dc converter with UC3525A,

the feedback compensation calculations require the "ramp voltage" (I assume it's the ramp voltage of sawtooth wave in pwm comparator), but I can't find it in datasheet,

what's this value for UC3525A?

Thank you.

over 4 years ago

0 Teng Feng over 4 years ago

TI__Genius 13660 points

Hi Can,

You are right there is no oscillator RAMP information provided in the datasheet.

Please allow me to check it then reply to you.

Thank you.

Teng

0 Teng Feng over 4 years ago in reply to Teng Feng

TI__Genius 13660 points

Hi Can,

The RAMP current can be approximately calculated by VREF / RT. Thank you.

Power management

Power management forum

UC3525A: PWM Ramp Voltage