SNOSD36A August 2017 – December 2017 LPV821
This single-supply, low-side, current-sensing solution shown in Figure 40 detects load currents up to 1 A. This design uses the LPV821 because of its low offset voltage and rail-to-rail input and output. The LPV821 in the main signal path is configured as a difference amplifier and a second LPV821 provides a buffered bias voltage to allow transition of signal below and above the bias level for bi-direction current sensing. The low offset voltage and offset drift of the LPV821 facilitate excellent dc accuracy for the circuit.