LM3429 Dimming Circuit?

T Kishi

Genius 4425 points

Other Parts Discussed in Thread: OPT8241, LM3429

My customer has question.

The customer sees this material.

OPT8241-CDK-EVM IB 10-50_REV2P0V1.pdf

Is U4 / U5 for dimming?

If not, please tell me the purpose of use.

Best Regard

T Kishi

over 8 years ago

0 Clinton Jensen over 8 years ago

TI__Mastermind 25500 points

Hello T Kishi,

I am not sure that U4 and U5 have anything to do with the LM3429 dimming. That function looks to be take care of with the CSH (analog) and NDIM (PWM) pins. But I am not familiar with this particular design. I am trying to track down the correct person for you that can answer what function they serve and I will forward this on to them when I do.

Thanks,

Clint

0 T Kishi over 8 years ago in reply to Clinton Jensen

Genius 4425 points

Hi Clinton

Thank you for replay.
I understood that U4 / U5 is a circuit unique to this EVM.
If you get infomation, please tell me .

Regard

0 Clinton Jensen over 8 years ago in reply to T Kishi

TI__Mastermind 25500 points

I have notified the correct people of this thread so you should have a response soon. Thanks.

0 Nithin Jose over 8 years ago

TI__Intellectual 1680 points

Hello T Kishi,

U4/U5 is not used for dimming. The enable signal for the modulation inverted( Illum_ENz ) is directly given to the nDim pin to allow full current during integration. For understanding the complete operation of the illumination driver, kindly go through the application report available at

http://www.ti.com/lit/an/sbaa209a/sbaa209a.pdf

Regards

Nithin

Power management

Power management forum

LM3429 Dimming Circuit?