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TPL0501-100: digital Pot- Ra input maximum voltage rating

Anbarasu R
Prodigy 130 points
Part Number: TPL0501-100

Hi,

I am designing a variable power supply with the out put of 0 to 24 V at 3 Amps.

I am using digitpot TPL0501-100.  I need to give max of 24V to HA terminal.

I am using digipot as voltage feedback to DC-DC buck Converter.

But in TPL0501 data sheet max Input voltage is Vdd. Its not sufficient for my design.

  • 0
    TI__Mastermind 46290 points
    Hello Anbarasu,

    The TPL0501-100 is limited to an absolute maximum supply voltage of 7V . This limitation comes from the process technology used to create the device and the specific transistors used from that process in this particular design. If you exceed 7V the device will be electrically overstressed and most likely fail in an unrecoverable state.

    There are internal ESD structures which resemble diodes in clamp to rail configurations inside the device to each the positive supply and ground. If these diodes are forward biased current will conduct - again leading to permanent damage for the device.

    There isn't really any application workaround for this concerning implementing the TPL0501-100 in this fashion.

    You may consider alternative approaches, as outlined in the below resources:

    e2e.ti.com/.../give-your-voltage-regulator-the-margin-it-deserves

    http://www.ti.com/tool/TIPD138