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TPS92630-Q1: feasible design for automotive lighting application

Smitha R
Prodigy 20 points
Part Number: TPS92630-Q1
Other Parts Discussed in Thread: TPS92633-Q1, TPS92633

Tool/software:

Hi,

We are planning to use TPS92630-Q1 or TPS92633-Q1 in our design for automotive interior lighting application. 6 LEDs are required to be driven with 11mA having Vf 2.8V each. 

Input voltage is from auxiliary battery 8V to 16V with nominal voltage 12V. 

Looking at the datasheet of TPS92630/TPS92633, I'm planning to connect 3 LEDs in series in one channel and second set of 3 LEDs in series in second channel. 

can you please confirm if this part number is suitable for the given LED specifications of 11mA with Vf 2.8V so we will proceed with design.

we also need to pass automotive tests such as ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b) & ISO 16750-2 (over voltage, reverse voltage, load dump tests) - as per application note, TIDUBP3A - this IC passes the required automotive tests. Hence we have chosen this IC and based on your confirmation on feasibility of this IC with the specifications of our LEDs, we will finalize and proceed for design and development.

Awaiting for your quick support in this regard.

  • 0
    TI__Prodigy 480 points

    Hello Smitha,

    The minimum current per channel for the TPS92630-Q1 is 10 mA and the minimum for the TPS92633-Q1 is 5 mA so you should be able to control the required amount of current.

    Is the 2.8V Vf the typical forward voltage or the maximum? Can I get more information about the LEDs?

    You might not provide a high enough supply voltage at the worst case scenario for 3 LEDs in series. The voltage drop required for the 3 LEDs is 2.8V*3 or 8.4V. You then need to add the maximum dropout voltage of each device. The data sheet states that this is 0.4V for both the TPS92630-Q1 and TPS92633-Q1. The worst case scenario would require at least 8.8V from the supply to power the chip and LEDs, which is greater than your auxiliary battery minimum.

    If you have any more questions, please let me know.

    Kind Regards,

    Nicholas Alexander

  • 0 in reply to Nicholas Alexander
    Prodigy 20 points

    Hi Nicholas,

    Thanks for your quick response. Do you have any part number which supports 6 channels so we can connect all 6 LEDs in parallel (1 LED / channel)

    Or we can use TPS92630 - 2 Quantities to connect 3 LEDs in paralle (1 LED/channel) . What are your thoughts about this kind of configuration?

    Thanks,

    Smitha R