LM3553: long time turn-on function

Hi Henry,

Our expert will give you reply later.

Hi Sir,

Any update?

Hi Henry,

Our expert is out of office. He will reply to you later.

BR, Gracie

Hi Sir,

The customer changed the product spec, if there have the LED driver torch mode can support up 1A(1-ch supported 1A, or 2-ch each supported 0.5A) and use I2C to adjust the torch current, please advise.

Application: Biometric product

Run Rate: 20Ku/Yr

Hi Henry, 

Sorry, we do not have such large current device supporting I2C. If the customer accept other brightness control method such as PWM input, I would recommend TPS92201. 

Thanks! 

Best, 

John. 

Hi Sir,

Thank you for your suggestion, but the end customer needs the I2C to adjust the torch output current.

Hi Henry, 

I have another recommendation to you. It is LM3645, RTMed next month. 4-ch flash, 360mA torch per-channel. I think customer could shunt 4 channels together to use. 

Thanks！ 

Best, 

John.