PMP6712: PMP6712

HI A.S.,
At a minimum you will need to change R119||R124 combination for the lower Vout. The compensation may need to change too. Bob is the designer. He will be in touch.
Thanks,
Ryan

Hi A.S.Bhushan,
There are no design calculators specific to PMP6712. There are Excel and Mathcad calculators for UCC28950.
www.ti.com/.../toolssoftware
Best Regards,
Bob Sheehan

Thank you.

Mr. Bob, Thanks for your reply.
I tried with excel sheet calculator (SLUC222D) for high voltage input to low output voltages.
Here output configuration is different . In this output has two MOSFETs only.

But in PMP6712, output has Four MOSFETs. Output configuration is entirely different.
I tried with SLUC222D excel sheet, but its not matched.
Please suggest me.

Hi A.S.

Correct, we do not have custom tools for every design configuration. You will need to go through the design manually to rescale components for a lower output voltage. The best general tool we have is Power Stage Designer 4.0.
www.ti.com/.../POWERSTAGE-DESIGNER
As a minimum you can change the output voltage set point by adjusting the top feedback divider resistor R119. You may also want to lower the output OVP by adjusting R118. The design should run at a reduced duty cycle. This could be further optimized back to the original duty cycle by changing the transformer turns ratio. Further optimization could be made by scaling the inductor and using lower voltage MOSFETs for the secondary bridge rectifier.

Best Regards,
Bob Sheehan