DRV421_16 Datasheet, PDF (33/44 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)
8.2.3 Using the DRV421 in ±15-V Sensor Applications
The DRV421 is designed for 3.3-V or 5-V nominal operation. To support a wider module current range, the
device is also used in ±15-V application, as shown in Figure 70. In this application, an external regulator
generates the 5-V supply for the DRV421. An additional external ±15-V power driver stage drives the
compensation coil. These techniques allow the design of exceptionally precise and stable ±15-V current-sense
modules.
+15 V
5V
LDO
VDD
-15 V
Fluxgate
Sensor
H-Bridge
Driver
ICOMP1
ICOMP2
External
Driver
GND
DRV421
Figure 70. ±15-V Current-Sense Modules
Compensation
Coil
RSHUNT
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