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BUF802: Estimating maximum input voltage for internal clamp

SRB
Intellectual 830 points
Part Number: BUF802

The datasheet specifies a maximum of 100mA for clamping diodes D1 and D2. Is there a way to estimate the maximum input voltage for this limit, considering a 2V output limit as in figure 8-2 of the datasheet?

Thanks,

Stephen

  • +1
    TI__Expert 8700 points

    Hi Stephen,

    The rating of the diodes is based off the amount of current they can withstand when forward biased. This means in order to forward bias either diode, the input must have to be a higher voltage than CLH or a lower than voltage Vs-. At this point the diode can be thought of as a short which will be able to handle up to 100mA of continuous current if the input can source that much current. Figure 8.5 highlights the output clamping response of the device, and the input is still within the limits of CLH and Vs- so there is no forward bias on the input diodes.

    Best Regards,

    Ignacio