TPS92641: Driver's Dimming Range 0.1%-100%

Hi Oben,

May I understand what are your LED forward voltage and current? Is the above 24V your input voltage?

Best Regards,

Steven

Hi Steven,

All in all, your question answers; unfortunately I can not share leds datasheet, but input of my circuit and Leds is same 24V, and max I for my Leds output is 3.75 A and my max W is 90W. Yes this is kind a automotive and ındustrıel grade. I want to see both solutıon I mean Programmable device and analog solution.

For my PWM frequency, it could be araound 400KHz-1MHz. Yes it could be shunt fet dim or not does not matter. And My Leds serial and pararel together. 2x2.

Finally, I am waiting quick response.

Regards

Hi Oben,

If you are looking for a buck LED driver, then TPS922055 and TPS92641 are good candidates here for a max 3.75A current output and a 0.1%-100% dimmable range.

Best Regards,

Steven 

Hello Steven,

Okay let me see. Thank you so much!

Best Regards

Hello Steven,

Are TPS922055DMTREVM, TPS92641EVM schematics okay for 0.1%-100% dimmable range ?

Regards

Hello Steven,

Okay. Thank you so much. What if I want to 5-6A output? In that time TPS922055 and TPS92641 are not enough for me right? What do you prefer that time?

Regards

Hi Oben,

TPS922055 is not capable of providing 5-6A output. TPS92641 is capable of providing 5-6A output.

Best Regards,

Steven

Hello Steven,

Okay. Thank you so much. My last question; What if I want to 8-9-10A output? In that time TPS92641 are not enough for me right? What do you prefer that time with the same functions TPS92641  ?

Regards

Hi Oben,

TPS92641 is capable of providing 8-9-10A output.

Best Regards,

Steven

Hello Steven,

Are you sure about that? Because it is saying "Iout (max) (A)5" in datasheet.

Regards

Hi Oben,

Yes. I am sure about that. We have seen lots of applications of TPS92641 in >=10A output condition.

Best Regards,

Steven

Hello Steven,

Oh, okay. I am %100 trusting you but I am wondering why its called max Iout 5A in datasheet instead of 10A?

Regards

Hi Oben,

The datasheet was written by the previous engineer and I am not sure why he/she wrote this.

I tend to think that the "5A" was derived from a common working condition. However, if you design the external components appropriately, it is possible for you to extend the current output capability of TPS92641 to >=10A. 

Best Regards,

Steven

Hi Steven,

Thank you so much!

Regards

Hi Oben,

You are welcome.

I am going to close this thread. Please feel free to contact me again if you have any further question.

Best Regards,

Steven