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TPS92314A: 50W isolated LED driver max output voltage

Nelson Spode
Prodigy 10 points
Part Number: TPS92314A
Other Parts Discussed in Thread: PMP6024, UCC28810, LM3447, TPS92210

I need to design a small size, isolated 50W LED driver. The purpose of this project is to replace an existent driver. I have many led panels in warehouse with 16 series LEDs (~52V). I noted the calculation tool limits the output to 10 LEDs (3.1V or 4V) and the reference designs are presented with 7 leds.

The parametric search ( http://www.ti.com/power-management/led-drivers/general-lighting-led-drivers/products.html#p207=AC/DC&p1129=Flyback ), shows 60V as Vout max.

Do you recommend me to follow the datasheet calculations for a 52V output? would I find a final design close to any limitation as Ton, inductance or any other?

 

Thanks in advance.

  • 0
    TI__Mastermind 28655 points
    Hello Nelson,

    Yes, you can just use the datasheet calculations for a 52 volt output. The TPS92314A doesn't know what the output voltage is, just what is reflected via the transformer turn-ratio. This design was originally intended as a low cost primary side regulated LED driver. Most uses of this were for low power bulb designs. It can be scaled up but I don't know of any designs at the power level. At higher power level other considerations have to be taken such as leakage inductance clamp on the primary side. I'm not sure if you are concerned about safety requirements but protecting the output from exceeding 60V in an open LED situation may require other circuitry/feedback.

    There are other parts that have reference designs near your power level that may be better suited to base your design on:
    PMP6024 is a 60W design which the power stage could be used and the feedback converted to current regulation, the flyback portion creates a 50V bus which is close to what your LED stack voltage is.
    www.ti.com/.../getliterature.tsp uses the UCC28810/11
    The LM3447, TPS92210 and UCC28810/11 are other parts you can look at.

    Best Regards,