UCC28070-Q1: Min/Max value of Dmax for specific Dmax typ

Takeshi Kasuya

Expert 3940 points

Part Number: UCC28070-Q1

Hi,

The datasheet specifies below Dmax value for Dmax typ 95% case,

I need Max/Typ/Min for specific Dmax such as 90% typ case.

Can you provide Dmax value for Min/Max for specific typ case? Or formula?

Min XXX %

Typ Set specific value like 90%

Max XXX %

Regards,

Kasuya

over 3 years ago

0 Yunsheng Qu over 3 years ago

TI__Genius 9790 points

Hi, Kasuya

DMAX is normally set at about 95% with the UCC28070. The tolerance is +-3%.

If the typical DMAX is set as 90%, the tolerance should be less than +-3%.

If you set it higher there is a risk of saturation of the boost or current transformer and if you set it lower the distortion of the input current will increase. So DMAX is recommended to set at 95%.

Regards

0 Takeshi Kasuya over 3 years ago in reply to Yunsheng Qu

TI__Expert 3940 points

Hi,

Thank you for the prompt response.

Let me confirm for DMAX typ 90% case.

The tolerance can be 3% x 90 / 95 correct?

Regards,

Kasuya

0 Yunsheng Qu over 3 years ago in reply to Takeshi Kasuya

TI__Genius 9790 points

Hi, Kasuya

I agree with the approximate method.

Regards,

Yunsheng

Power management

Power management forum

UCC28070-Q1: Min/Max value of Dmax for specific Dmax typ