DRV421_16 Datasheet, PDF (31/44 Pages) Texas Instruments – Integrated Magnetic Fluxgate Sensor for Closed-Loop Current Sensing

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DRV421
SBOS704B – MAY 2015 – REVISED MARCH 2016
Typical Application (continued)
8.2.2 Differential Closed-Loop Current Sensing Module
The differential closed-loop current sensing module (Figure 68) measures the difference between two or more
currents. Typical end-applications for such modules are leakage or residual current sensors. The high sensitivity
of the fluxgate sensor and the low temperature drift make the DRV421 a suitable choice for this type of modules.
The principle operation is the same as that of the closed-loop current module described in the Closed-Loop
Current Sensing Module section. The compensation current corresponds to the current difference between the
primary conductors.
Differential Closed-Loop Current Module
VDD
optional
magnetic
core
compensation
coil
return
current
conductor
primary
current
conductor
RSHUNT
GSEL0
GSEL1
RSEL0
RSEL1
DRV421
VOUT
REFIN
REFOUT
DEMAG
OR
ER
MCU
GPIO0
GPIO1
GPIO2
ADC
R1
R2
C1
C2
VDD
Figure 68. Differential Closed-Loop Current Sensing Module
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