UCC28910: RPRL

Kuramochi Tadahiko

Guru 28715 points

Part Number: UCC28910

Hi,

When output current is small, RPRL is calculated negative value as below and attached.

SLUC503B_UCC28910 Design Calculator.xlsx

How should I set RPRL in this case?

Or, is small current not allowed?

Best Regards,

Kuramochi

over 4 years ago

0 Yunsheng Qu over 4 years ago

TI__Genius 9790 points

Thanks for your interest in TI here. I've contacted the appropriate product group. You should hear from them soon.

0 Kuramochi Tadahiko over 4 years ago in reply to Yunsheng Qu

Guru 28715 points

Hi Qu-san,

How is this progress?

Best Regards,

Kuramochi

0 Mike O' over 4 years ago in reply to Kuramochi Tadahiko

TI__Guru* 80356 points

Hello,

If the tool calculates a negative pre-load the design may not need it.

Regards,

0 Kuramochi Tadahiko over 4 years ago in reply to Mike O'

Guru 28715 points

Mike-san,

I have an additional question.

The following is your comment on another thread.

"A pre-load resistor is need so the design stay in regulation under no load conditions. Generally 2 mA of preload is enough. "

UCC28910: Small output current - Power management forum - Power management - TI E2E support forums

e2e.ti.com

Part Number: UCC28910 Other Parts Discussed in Thread: UCC28C42 Hi, My customer is considering using UCC28910, the load current is 40mA(max). In this case,

Is eliminating RPRL allowed?

Best Regards,

Kuramochi

0 Mike O' over 4 years ago in reply to Kuramochi Tadahiko

TI__Guru* 80356 points

Hello Kuramochi,

I have always used it in my designs with PSR control. I would leave a place holder for it anyway.

Regards,

Mike