UC3854B: uc3854b

Russell Hammad

Part Number: UC3854B
Other Parts Discussed in Thread: UCC29910A

I am not getting the PFC design to work properly and my output voltage level was less than input. Also the current waveform was badely distorted.

My input voltage varies from 5 to 70 v AC.

Any advice on how to troubleshoot this problem.

Thanks

Russell

0 David Huang33 over 5 years ago

Hi Russell:

can you share the schematic to me and offer me more information about the project?

input voltage range,PFC output,power level.

0 Russell Hammad over 5 years ago in reply to David Huang33

Hi David,

The design is based on the recommended design from TI documentation with minor changes that suites the UC3854B

The input voltage range is 5-60 VAC

PFC output was around 30VAC at Vin =60VAC

Output current waveform was very distorted.

Russell

0 David Huang33 over 5 years ago in reply to Russell Hammad

Hi Russell:

from you description, when input at 60VAC, the output is only 30VDC?

is it correct?

If this is correct, the applicance is a buck PFC solution, I do not think UC3854B is a good choice.

Ti has UCC29910A, can you please check the datasheet to see whether it meets your requirment? thanks.

0 Russell Hammad over 5 years ago in reply to David Huang33

Hi David,

The main purpose of the circuit is to correct the power factor ,not necessarily to boost the voltage buts its definitely a welcomed side effect.

Which chip do you think can help me more?

Russell

0 David Huang33 over 5 years ago in reply to Russell Hammad

Hi Russel:

you can reach out to UCC29910A. This is a buck type PFC controller.

Power management forum