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| DRV8320_17 Datasheet, PDF (41/89 Pages) Texas Instruments – 6 to 60-V Three-Phase Smart Gate Driver | |||
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DRV8320, DRV8320R
DRV8323, DRV8323R
SLVSDJ3A â FEBRUARY 2017 â REVISED APRIL 2017
8.3.4.2 Unidirectional Current Sense Operation (SPI only)
On the DRV8323 and DRV8323R SPI devices, use the VREF_DIV bit to remove the VREF divider. In this case
the shunt amplifier operates unidirectionally and SOx outputs an analog voltage equal to the voltage across the
SPx and SNx pins multiplied by the gain setting (GCSA). Use Equation 4 to calculate the current through the shunt
resistor.
I VVREF VSOx
GCSA u RSENSE
(4)
R2
R3
R4
SOx
VCC
VREF
0.1 â¦F
R6
+
±
R5
R1
±
R1
+
R2
R3
R4
I
SPx
SNx
RSENSE
R5
Figure 38. Unidirectional Current-Sense Configuration
SO (V)
VREF
VVREF ± 0.3 V
VLINEAR
SP ± SN (V)
Figure 39. Unidirectional Current-Sense Output
Copyright © 2017, Texas Instruments Incorporated
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Product Folder Links: DRV8320 DRV8320R DRV8323 DRV8323R
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