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LM3406HV-Q1: buck led driver for motorbike light

Antonio Faggio
Expert 7890 points
Part Number: LM3406HV-Q1
Other Parts Discussed in Thread: LM3406HV, LM3402HV, TPS92692, TINA-TI

Hi All,

I am looking for a led driver for a motorbike headlight.

It should be a buck that can withstand an input voltage of at least 75V.

The characteristics of the circuit in which we would like to implement the LED driver, in its normal operation, are:
• Vin between 18V and 32V;
• as load only one branch including 3 LEDs in series, whose total drop is about 9V  +-1V);
• the load current must be 200 mA;
• there is no need for dimming.

I found the component: LM3406HV-Q1.
But I noticed that on page 6 of the datasheet there is the load efficiency / current graph, and the behavior for a 200 mA load is not shown.
So, could this device fit for a load current of 200 mA or is it too low?

Would you have other devices to recommend to me for the application I described to you?
Important are the dimensions as small as possible, and that has the minimum necessary to allow the piloting of the LEDs when powered,
An interesting feature would be the possibility of having the spread spectrum, in order to reduce emissions.

Many Thanks,

Antonio

  • 0
    TI__Mastermind 28655 points

    Hello Antonio,

    The LM3406HV is a 1.5A rated part.  It can be setup to run 200 mA, it's not shown there since this is a higher current part.  There are other similar parts such as the LM3402HV meant for lower current.  If you need the Q-grade part and 75V rating the choices do become limited.  If you can use a 65V rated part the TPS92515AHVQ might be a good choice.  The 'LM' parts are older parts which do not have spread spectrum.  The TPS92692 and TPS92682 do have spread spectrum but are more complicated parts to use and use external MOSFETs.

    Best Regards,

  • 0 in reply to Irwin Nederbragt
    TI__Expert 7890 points

    Hi Irwin,

    I am analyzing the solution using the LM3402HV device, and I would like to make simulations, but I am encountering errors.

    Before I tried to download the PSpice model from the TI website, but it seems that it is encrypted and I cannot correctly include it in the simulator.
    I also tried using the TINA-TI simulator, but when I simulate it tends not to converge to a solution.

    Is it possible to have an unencrypted spice model?
    Do you have any info about it?

    Please also email me in private if needed to share some confidential info. This is a customer's request.

    Many Thanks,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Expert 3920 points

    Hi Antonio,

    I will close this thread as we have communicated and take this offline already.

    Thank you!