The circuit-breaker function compares the voltage across RSENSE to the voltages across RSCOMP and RFCOMP. See Figure 2. When the voltage across RSENSE exceeds the voltage across either RSCOMP or RFCOMP， the circuit breaker will trip. The voltages being compared will typically be in the 25mV to 100mV range. Improper component placement and layout can result in nuisance trips or failure to trip under some fault conditions.
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　　The MAX5977’s current reporting senses the voltage across RSENSE through the IN and SENSE pins. See Figure 3. Internally， a transimpedance amplifier with a gain of 2500μS outputs a current on the CSOUT pin. An external resistor， RCSOUT， converts this current into a voltage and， along with RSENSE， sets the overall gain of the circuit. Similar to the circuit-breaker function， the voltage measured across RSENSE is quite small， typically ranging from a couple of millivolts to 50mV. Improper placement or routing of the components shown in Figure 3 results in reduced accuracy across RCSOUT.