DRV8702D-Q1 Datasheet, PDF (25/66 Pages) Texas Instruments – Automotive Half-Bridge Gate Driver

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DRV8702D-Q1, DRV8703D-Q1
SLVSDX8 – MARCH 2017
AVDD
AV
VIO
SP-SN (V)
Figure 34. Current Sense Amplifier Output
If the voltage across the SP and SN pins exceeds 1 V, then the DRV870xD-Q1 device flags an overcurrent
condition.
The SO pin can source up to 5 mA of current. If the pin is shorted to ground, or if this pin drives a higher current
load, the output functions as a constant-current source. The output voltage is not representative of the half-bridge
current in this state.
I(CHOP)
Drive
t(DRIVE)
VVREF
Brake and Slow Decay
tOFF
Drive
t(DRIVE)
Brake and Slow Decay
tOFF
Figure 35. Current Sense Amplifier and Current Chopping Operation
During brake mode (slow decay), current is circulated through the low-side FET. Because current is not flowing
through the sense resistor, the SO pin does not represent the motor current.
Copyright © 2017, Texas Instruments Incorporated
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