I want to use the AD8129 as a high frequency high side current sensor in my switched mode power supply. The AD8129 would measure voltage across a shunt resistor on the high side of the SMPS output voltage, so the common mode voltage would be 13V. I want to power the AD8129 with a single +15V supply, where -Vs is 0, and use resistor dividers to offset the amplifier output voltage to ~1.5V via the REF pin. The output of the amplifier goes to a comparator that is on a +3.3V supply. Is this possible?
I have begun testing this circuit, but the output voltage seems to be offset at ~4V given resistor values that I calculated from the datasheet.
Thanks for your response. We are using current mode control for a high switching frequency SMPS, and thus would need the higher bandwidth device like the AD8129 than the AD8216 or ADM4073.
Can the AD8129 work with a single +15V supply? If so, how would the feedback and gain equations change? Thanks!