CCS/UCD3138PFCEVM-026: About the single-phase Boost PFC official routine PWR026_PFC

Hello,

We are preparing a response for why the firmware is behaving this way given the inputs and outputs you specified.

Hello,

what's your application? why the input and output voltage are so low? are you testing on TI PWR026 EVM or you have designed your own board?

Hello,

I have designed a low voltage PFC board and it is modeled after TI UCD3138PFCEVM-026. So now I need to change the PWR026_PFC code to

meet my voltage requirements.

This low voltage board is just for learning, and high pressure is too dangerous for school laboratories.

So how can the PWR026_PFC code be changed to a low voltage?

Hello，

Can you explain the minimum input and output voltage of the UCD3138PFCEVM-026 board? And how to change it.

The UCD3138PFCEVM-026 is designed for universal input 85V-265V. The minimum input voltage is 70V, however, its performance is not guaranteed at 70V.

You need to design your own PFC board for such low input and output voltage  

Hello,

I have designed my own PFC board, and the code of only 3138 is not completed.

So can you tell me how to change the PWR026_PFC program?

Hello,
I have already made my own PFC board.

Hello,

The PFC code has brown out protection, you can disable it by:

#define VAC_MIN_ON_SQ_AVG (1)

#define VAC_MIN_OFF_SQ_AVG (0)

Hello,

I have added to main.c as you said, and have changed the input voltage to 15V and the output voltage to 25V. The code is compiled successfully, after which I will try the board effect.

If there is any problem, I will continue to contact you, thank you.