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TPS92690-Q1: whether the maximum current “5A” is the continuous working current of tps92690-q1？

Kane Zhang
Intellectual 585 points
Part Number: TPS92690-Q1
Other Parts Discussed in Thread: TPS92690, TPS92640

 Customer want to design a blue ray therapy instrument, which needs to drive 4 LED lights.  Vin：15Vdc；Vout/Iout：13Vdc/8A

 He chooses tps92690-q1,and the datasheet shows that the maximum current is 5 amps.

He wants to know whether the maximum current “5A” is the continuous working current of tps92690-q1？

Whether the maximum operating current determined by the external Mosfet? 

Or do you have other parts to recommend.

Thanks

B.R.

Kane

  • 0
    TI__Mastermind 28655 points
    Hello Kane,

    From the datasheet:
    "When designing, the maximum attainable LED current is not internally limited because the TPS92690 device is a
    controller. Instead it is a function of the system operating point, component choices, and switching frequency
    allowing the TPS92690 device to easily provide constant currents up to 5 A. This simple controller contains all
    the features necessary to implement a high efficiency versatile LED driver."

    The output current is not limited to the IC, it is also not limit by just the MOSFET. The maximum output current depends on a lot of parameters such as Vin, Vled, switching frequency, MOSFET (due to IC gate drive and thermal), maximum ambient temperature, how the board is designed (heatsinking) as well as many other variables. The parts used will have to be designed to handle the power at 8A such as the current sense resistor.

    Another part that has been used at over 20A is the TPS92640/641.

    BR,