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TPS92630-Q1: how many LEDs can I drive?

Paolo Colombara
Intellectual 260 points
Part Number: TPS92630-Q1
Other Parts Discussed in Thread: TL4242-Q1, TPS92612-Q1, TPS92611-Q1,

Hello all,

I am looking for a linear constant current/sink/source for a string of white LEDs, and I have noticed the TPS92630-Q1 which could do it for me. While reading the datasheet, it is noted that it can drive up to three LEDs. Now I wonder: since it is an automotive product, does it mean that it can drive up to three LEDs if powered at 12V? Because it seems strange that it can reach 40V at the input and then not being able to drive more than three LEDs... I mean, a lot of dissipation! Note that the same question is valid also for the TL4242-Q1, TPS92611-Q1, TPS92612-Q1... I wonder why for all of them the reference diagrams report only 3 LEDs... Is it true it cannot go higher than that even if the supply can reach 40V?...

Thanks in advance!

Paolo.

  • 0
    TI__Expert 5475 points
    Hi Paolo,

    Yes, your understanding is right. In an automotive battery-supply application, if we want to have constant output current, typically there are two or three LEDs in a string. But if the supply voltage is higher, of course it can drive more LEDs in a string. For other devices you mentioned, it is the same.

    Best Regards,
    Shirley He