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TPL0102 Setting of VDD, VSS, GND

Tsuguhiko Asai
Expert 1260 points
Other Parts Discussed in Thread: TPS65130

Dear All,

・Our customer wants to use TPL0102 with TPS65130.

・TPS65130 uses two sets of partial resistance with the power supply product
　that both output the positive voltage and the negative voltage.

　http://www.tij.co.jp/product/jp/TPS65130?keyMatch=TPS65130&tisearch=Search-JP-Everything

・When a user adjusts partial pressure resistance of the positive-voltage side
　and the negative-voltage side, is the following setting right?
　(Single Supply Operation)

　[Setting Example]　
　VDD ：5 [V]
　VSS ：0 [V](GND)
　GND ：0 [V]

・Or does a user have to set it as follows? (Dual Supply Operation)

　[Example of setting]
　VDD ：2.5[V]
　VSS ：-2.5[V]
　GND ：0[V]

Best Regards,
Tsuguhiko Asai

  • 0
    TI__Genius 16450 points

    Asai-san,

    To verify, your questions for VDD and VSS are for the TPL0102's power supply rails?

    The VDD and VSS should be connected to the power supply rails of the the most positive and most negative signal that the device will see. A DPOT is not a mechanical potentiometer, and the internal structure must be properly biased in order to pass voltages.

    So if you will have a negative voltage (relative to ground) supplied to any of the potentiometer pins, you must connect VSS to the negative power supply rail.

    Say for example: if your voltages seen at the potentiometer pins will swing from -2.5 to 2.5V (relative to ground), then connect VSS to the -2.5V, GND to ground, and VDD to +2.5V

    Of course, the signal seen by the device is all relative to ground. So if you want, you *can* take the single supply approach and tie VSS and GND together at 0V and then VDD at 5V (relative to ground), and as long as your signals are within this 0-5V range (relative to the ground).

    In short: Either appraoch is fine as long as you are sure that the voltage of the signal is within the range of VSS and VDD. If you have a +/-2.5V power supply with a ground, I would go the dual supply approach, but there is no real benefit between choosing one or the other.