UCD3138: Questions about CBC and blanking window (minimal duty output)

HAN LEE

Part Number: UCD3138

Hello Experts,

what's the meaning of blanking window duty output if the current continuous over cbc level, why does it not keep zero duty until the current within the cbc level ,thanks.

over 5 years ago

0 Bosheng Sun over 5 years ago

TI__Expert 7310 points

Hello, where does the above Chinese description copied from?

0 HAN LEE over 5 years ago in reply to Bosheng Sun

Expert 1515 points

Hi Bosheng sun,

Pls see the attachment and give me some suggestions ,thanks.UCD3138的逐週期保護功能說明.pdf

0 Bosheng Sun over 5 years ago in reply to HAN LEE

TI__Expert 7310 points

the CBC function is disabled during blanking window, so even if the current signal exceeds the CBC threshold during blanking window, the PWM pulse width is not chopped. To reduce this minimum duty, you can reduce the blanking window.

0 HAN LEE over 5 years ago in reply to Bosheng Sun

Expert 1515 points

Hi Bosheng sun,

Will you recommend tuning blanking window dynamically if I want to reduce the minimum duty? thanks.

0 Bosheng Sun over 5 years ago in reply to HAN LEE

TI__Expert 7310 points

Hello, the blanking window is used to prevent CBC from being mis-triggered by any spike at the beginning of the current sense signal. You can change the blanking window as far as you can guarantee that CBC will not be mis-triggered.

0 HAN LEE over 5 years ago in reply to Bosheng Sun

Expert 1515 points

Hi Bosheng ,

Thanks, get it.

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UCD3138: Questions about CBC and blanking window (minimal duty output)