UCC28630: UCC28630 Fsw selection and simulation model

Yunjing Wang1

Part Number: UCC28630
Other Parts Discussed in Thread: UCC28634, UCC28631

Hi Team,

My customer is considering using UCC28630 to design Dual switch flyback, input 326Vdc~848Vdc, 3 outputs(total100W max): 12V/83W , -12V/3.6W, 5V/2.5W, expect efficiency is 85%~90%.

1.About the inductance calculation, how to choose fsw value of Equatin 25 in datasheet 9.2.4? Should it always be 65kHz or it can be larger like 70kHz~100kHz? Cause larger Fsw helps reduce transformer size.

2. Is there a UCC28630 PSIM simulation model to help simulate the device's work with customer external component value? This will helps a lot with customer design.

Thanks and best regards

Yunjing

over 3 years ago

0 Mike O' over 3 years ago

TI__Guru 66135 points

Hello,

I checked the UCC28630 product folder and there is not simulation module for this device.

There is a Webench design tool that can help you in your design process the following will get you to the link.

You should be able to design this device up to a maximum switching frequency of 110 kHz according to the data sheet.

Regards,

0 Yunjing Wang1 over 3 years ago in reply to Mike O'

TI__Intellectual 2780 points

Hi Mike,

Thanks for your reply.

Also, customer is considering DC HV start up, can you help clarify the difference between UCC28631 and UCC28634? Thank you！

Regards

Yunjing

0 Mike O' over 3 years ago in reply to Yunjing Wang1

TI__Guru 66135 points

Hello,

The UCC28631 has a VDD OVP of 17.5V, while the UCC28634 has a VDD OVP = 14.85V. This is the only difference between the two devices that I can see on the data sheet.

Regards,

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UCC28630: UCC28630 Fsw selection and simulation model