Low-Side Current Shunt Sense; Current Sense Configuration - Texas Instruments BOOSTXL-DRV8301 Hardware User's Manual

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5.2

Low-Side Current Shunt Sense

The Motor Drive Booster Pack has low side current shunt sense for each half-bridge (phases A, B, and C).
The current sense setup takes advantage of the dual shunt current amplifiers (phases A and B) of
DRV8301 and an external TI OPA2374 CMOS operation amplifier (phase C). The configuration for the
low-side sense resistor is shown in
through differential connections. The current measurement is scaled for ±16.5 A. This requirement and the
calculations are described in the InstaSPIN™ FOC
The configuration for the external OPA2374 (phase C current sense), shown in
mirror the internal amplifiers of the DRV8301. The gain is set to 10 with a reference voltage of
approximately 1.65 V.
SLVU974 – October 2013
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Figure 7. The amplifier senses voltage across a 0.01-Ω sense resistor
User's Guide
Figure 7. Current Sense Configuration
Copyright © 2013, Texas Instruments Incorporated
Detailed Hardware Description
in Chapter 5.
Figure 8, is set to closely
BOOSTXL-DRV8301 Hardware User's Guide
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