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TPS92513HV: LED Driver Recommendation for Buck Topology

Hong Tay
Expert 2465 points
Part Number: TPS92513HV
Other Parts Discussed in Thread: LM3447, TPS92314, TPS92075, TPS92074, LM3444

Hi SIr/Madam,

My customer have below requirement for LED driver design. Please advise if TPS92513HV is the correct part to propose. If there is reference design for 265V application is preferred.

Non-Dimmable

Single coil inductor

70V, 65mA CC

High PFC and Low THD

With NTC (LED temperature control)

90-265V universal input

Thanks. Hope to hear from you soon.

  • 0
    Expert 2465 points
    Hi Sir/Madam,

    Any update?

    Thanks.
  • 0 in reply to Hong Tay
    TI__Mastermind 25500 points

    Hello,

    The TPS92513HV is not rated for high enough voltage for that application. Even as a second stage it cannot do 70V output. This looks to be more of a AC-DC application which that device is not suited for. I will pass this along to somebody more familiar with AC-DC devices to see if they have any good recommendations. I know universal inputs can be tricky.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    TI__Mastermind 28655 points

    Hello,

    70 volts and 65 mA is 4.55 watts.  If you need good power factor correction it may not be possible with a buck converter at 90 VAC input with a 70 volt LED stack.  If you plan on using a single coil inductor the bias voltage will have to be generated from the rectified AC which will lower efficiency some.

    The TPS92314(A) or LM3447 could do buck boost but interfacing to an NTC thermistor may get a bit complicated

    The TPS92074 or TPS92075 has been configured as a buck-boost and may be a bit easier to interface an NTC thermistor to.

    Is a single coil inductor the only option?

    How accurate does the NTC circuit have to be?  What do they want the NTC to do, fold back when too hot, control the LED current based on temperature?

    Thanks,

  • 0 in reply to Irwin Nederbragt
    Expert 2465 points
    Hi Irwin,

    Thanks for your kind explanation and recommendation.

    For the buck LED driver, if input voltage of 190-265VAC, 50Hz, without NTC. Any good suggestion?

    What is the advantage comparing AC high voltage linear LED driver with Buck LED drivers?

    Thanks.
  • 0 in reply to Hong Tay
    TI__Mastermind 28655 points

    Hello,

    I would look at the TPS92074 if there is no Triac dimming.  The datasheet also shows interface to an NTC thermistor.  If there is Triac dimming the TPS92075 would work.  You could also use the LM3444.

    Thanks,

  • 0 in reply to Irwin Nederbragt
    Expert 2465 points
    Hi Irwin,

    Thanks for your advice.

    We found that TI buck LED driver need 2 MOSFETs for surrounding component while NXP SSL5031CTS only need 1 MOSFET. There is cost concern.

    Do you have any comparable recommendation?

    Datasheet: media.digikey.com/.../SSL5031CTS.pdf

    Thanks.
  • 0 in reply to Hong Tay
    Expert 2465 points

    Please refer to the schematic for NXP SSL5031CTS.

    SSL5031CTS

  • 0 in reply to Hong Tay
    TI__Mastermind 28655 points

    Hello,

    This is a floating buck.  The TPS92074 uses the second MOSFET to generate VCC, Q2 on PMP6007.  This can be an inexpensive part, high voltage NPN transistor, or possibly removed using a resistor to supply VCC and a zener clamp at a slight efficiency drop.

    For quick start-up the TPS92074 would require at least a high voltage NPN transistor for start-up.

    Thanks,