Current sensing components
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IR2172 ? current-sense-to-PWM -260-+260mV input. MAX4071 100V/V, bidirectional, with polarity output pin 100v/v isn't quite enough, but with an ADC reference of 1v, that would give full scale at 100A, or 100mA per bit. not great but the same as the Tri-Metric does, anyway. TI INA169 current/voltage output, unidirectional, can set gain pretty high