UCC28C43: Sometimes can't boost to 54V

Jimmy Lai

Part Number: UCC28C43

Hi Team

The customer's project circuit specifications are as follows:

Vin = 12V

Vout = 54V

Iout = 0.6A

and customer has a issue that sometimes the circuit can't boost up to 54V

Ouput voltage is 54V 、24V and 0V

Please refer to the schematic as below

May I ask what could cause such a problem?

Can you please double confirm the schematic ? thank you very much!

0 Peter Meaney over 5 years ago

Hi Jimmy,

Can you attach a pdf of the schematic to the post, it is not possible to read the component values from the image on the forum.

Can the you also attached waveforms of the output voltage and the CS and COMP pin when the output voltage starts to decreases.

Thanks

Peter

0 Jimmy Lai over 5 years ago in reply to Peter Meaney

Hi Peter

I sent the schematic and waveform to your e-mail.

please kindly to double check.

Thanks!

Jimmy

0 Peter Meaney over 5 years ago in reply to Jimmy Lai

Hi Jimmy,

I am going to close this post as we are supporting by email.

Regards

Peter

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