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TPS92692: 180W LED Driver with wide Vin range and wide VLED range

TecnoLAB
Intellectual 400 points
Part Number: TPS92692
Other Parts Discussed in Thread: TPS92691, TPS92691EVM-001

Hello,

I have to develop a LED driver for different LED loads. Here are main characteristics

Vin can be 24V or 48V

Load can be:

6 LED 18V 3,3A 60W or

12 LED 36V 3,3A 120W or

18 LED 54V 3,3A 180W

Do you think this goal is achievable with a single board?

I was thinking to use TPS92691 or TPS92692 in sepic configuration, is it correct or there are better solutions?

I saw TPS92691EVM-001 and I was thinking to start develop using this scheme.

Thank you in advance for your support

  • +1
    TI__Mastermind 18890 points

    Hello,

    The TPS92691 and TPS92692 are controllers so it can theoretically be done.  But there are constraints that might not be feasible or practically at times.  For a SEPIC regulator the efficiency will be about 70%-75% so the power loss for the 180W case will be high in the power stage (77W) and you have to get that heat out of the power components.  For the Boost regulator the efficiency can be about 90% so it help reduce the power loss for the 180W case.

    The FET you have to use will be a large FET due to the power level and the GATE drive and switching loss need to be considered and should be in the range of 100KHz or less.

    Depending on your requirements and If you can manage the power loss, heat and components selections then you can use it as a SEPIC.  Your requirements are so wide and I would consider not doing one topology for all the cases.

    A note is that the evaluation board for the TPS92691 is not designed for these power level.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Intellectual 400 points

    Thank you Tuan,

    I didn't know that sepic has this efficiency, i can't  manage this power loss... I think I have to reconnect LEDs and use it in boost topology

  • 0 in reply to TecnoLAB
    TI__Mastermind 18890 points

    Hello,

    Just remember that for Boost regulator the input voltage has to be less than the output LED voltage.  Good luck.  I'll close this thread.

    Thanks Tuan