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DRV8872_15 Datasheet, PDF (7/25 Pages) Texas Instruments – DRV8872 3.6-A Brushed DC Motor Driver With Fault Reporting (PWM Control)
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7 Detailed Description
DRV8872
SLVSCZ0A – AUGUST 2015 – REVISED AUGUST 2015
7.1 Overview
The DRV8872 is an optimized 8-pin device for driving brushed DC motors with 6.5 to 45 V and up to 3.6-A peak
current. The integrated current regulation restricts motor current to a predefined maximum. Two logic inputs
control the H-bridge driver, which consists of four N-channel MOSFETs that have a typical Rds(on) of 565 mΩ
(including one high-side and one low-side FET). A single power input, VM, serves as both device power and the
motor winding bias voltage. The integrated charge pump of the device boosts VM internally and fully enhances
the high-side FETs. Motor speed can be controlled with pulse-width modulation, at frequencies between 0 to 100
kHz. The device has an integrated sleep mode that is entered by bringing both inputs low. An assortment of
protection features prevent the device from being damaged if a system fault occurs.
7.2 Functional Block Diagram
bulk
VM
0.1 µF
GND
PPAD
IN1
IN2
nFAULT
Power
VM
VCP
Charge
Pump
VCP
VM
Gate
Driver
OUT1
OCP
VCP
VM
BDC
Core
Logic
Gate
Driver
OUT2
OCP
ISEN
+
-
VTRIP
Protection Features
Overcurrent Temperature
Monitoring
Sensor
Voltage
Monitoring
RSENSE
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