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TPS92692: TPS92692

Timur Ha
Prodigy 110 points
Part Number: TPS92692
Other Parts Discussed in Thread: TPS92640, TPS92691

Hello,

Is it possible to use this driver to driver this LED: https://www.osram.com/ecat/OSRAM%20OSTAR%C2%AE%20Projection%20Power%20LE%20CG%20P3AQ/com/en/class_pim_web_catalog_103489/prd_pim_device_8160601/

It has a forward voltage of 19.2-22.4V and the maximum surge current 14A?

Best regards,

Timur

  • 0
    TI__Mastermind 18890 points

    Hello Timur,

    Since the TPS92692 is a controller it can be used to drive the voltage and current level that you mentioned depending on external components selection and design.  That being said, there are limitations such as how large the external FET that is being used and the switching frequency since the gate drive of the TPS92692 is limited and this is a high power design.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Prodigy 110 points

    Hello Tuan,

    What do you mean how large is the external FET? Is it a limitation from the driver perspective or it is a limitation for a designer in terms of space? The switching frequency we are dealing with is 4-50Hz

    Best regards,

    Timur

  • 0 in reply to Timur Ha
    TI__Mastermind 18890 points

    Hello Timur,

    The switching frequency that I am talking about is the power stage switching frequency controlled by Rt and not the PWM dimming frequency of the LED.  Since it's a high power peak power ( >280W ) application, you will need a FET that can handle that high current and it will be a large FET or paralleling FET to handle the current and power.  Large FET will require larger gate driver to switch at certain frequency and the TPS92692 has limited gate drive so this is what you have to worry about.  These are fundamental of regulator designs.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Prodigy 110 points

    Hello Tuan,

    I see now what your concern is. Do you think that 0.5A which is driving capability of the FET is not enough to switch MOSFETs fast enough?

    Also on the TI website it states that the current Iout (Max)(A) = 5. So what is this current?

    Best regards,

    Timur

  • +1 in reply to Timur Ha
    TI__Mastermind 18890 points

    Hello Timur,

    That current is just a number based on normal use of the part.  Again, this is a controller and the external components determine the output power levels.  If you are trying to drive 14A to your LED as mentioned in your original post then a 0.5A FET will not be able to drive a constant 14A to the output.  The FET has to be able to handle the current, voltage and power level of your design.  This is fundamental of power regulator design.  Please read the specification on the FET selection part and familiarize yourself with power regulator designs.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Prodigy 110 points

    Hello Tuan,

    Thank you for your support

    Best regards,

    Timur

  • 0 in reply to Timur Ha
    TI__Mastermind 18890 points

    Thanks Timur.  We will close this thread.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    TI__Genius 17150 points

    Hi Tuan,

    Good Day. On behalf of our customer, he wants to know how about using TPS92640 and TPS92691. Would they be capable to meet his needs? Please advise. Thank you very much.

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Mastermind 18890 points

    Hello Ray,

    I am going to take this offline and send you an email on this.

    Thanks Tuan