UCC28089: softstart of UCC28089

Kaji@PAN

Part Number: UCC28089

Hi,

I want to make a soft start so that no inrush current will occur at UCC 28089.
Is it possible to add soft start function with this device?

The structure is a half bridge. The control IC on the secondary side is not used. The IC is only on the primary side.

Best Regards,

over 9 years ago

0 Peter Meaney over 9 years ago

TI__Mastermind 31580 points

Hi Kaji,

I have asked one of our applications engineers to respond to your post. You should see a reply soon.

Regards

Peter

0 Kaji@PAN over 9 years ago in reply to Peter Meaney

Mastermind 7840 points

Hi Peter,
Thanks for the reply.Then I will wait for contact.
Best regards,

0 Oliver Pan91 over 9 years ago in reply to Kaji@PAN

TI__Intellectual 2230 points

The UCC28089 has a brief 5 to 7 cycle leading-edge modulated soft-start cycle, the soft start progressively increases the output duty ratio over the next five to seven oscillator cycles. Please refer to below figure for the soft waveforms in datasheet.

Power management

Power management forum

UCC28089: softstart of UCC28089