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TPS65982 Sink 20@3

Devon Gavigan
Prodigy 10 points
Other Parts Discussed in Thread: TPS65982

HI,

I am trying to setup two TPS65982 BoosterPack boards so in Notebook, Moblie Work Station so that they sink 20@3.   I have successfully got the voltages to sink, however, there seems to only be a couple milliamps running through.   Any advice about the overall setup that may be wrong would be greatly appreciated.  

Regards Devon

  • 0
    TI__Mastermind 30280 points

    Devon,

    Your setup sounds good to me :-)

    The Firmware installed on the TPS65982-EVMs is showcasing the USB PD features of the Policy Engine and allowing you to verify that the VBUS voltage is 5V, 12V, and 20V depending on the PD contract.

    If 1 of the EVMs is operating in "Dead Battery Mode" - the DC Barrel Jack is not plugged in and Type-C is the only power applied- then you might see a little more consumption (LEDs and TPS65982 in Active state powered from VBUS) on the order of 10-100mA.

    If both EVMs have a DC Barrel Jack Applied, the power delivered over the Type-C cable is essentially 0 Amps. Both EVMs are receiving 20V from the DC Power Supply and the power on VBUS is never going to be higher than the input (passive switches and buck converters only, no boost circuitry).

    However, if you CAREFULLY apply a load on VBUS (electronic load or thermally insulated power resistor), you will be able to verify that the EVM can supply a little over 3 Amps before entering over-current protection and forcing a PD Hard Reset.

    If you do use a power resistor and pull up to 3A at 20V (6.67-Ohms), the power dissipated in the resistor will be very high (60 Watts). You may want to use 6 10-Watt resistors in parallel that are equivalent to RLoad= 6.67 Ohms or only measure the current for a very short period of time.