DRV8814_16 Datasheet, PDF (8/26 Pages) Texas Instruments – DC Motor Driver IC

DRV8814
SLVSAB9E – MAY 2010 – REVISED NOVEMBER 2015
7 Detailed Description
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7.1 Overview
The DRV8814 is an integrated motor driver solution for two brushed DC motors. The device integrates two
NMOS H-bridges, current sense, regulation circuitry, and detailed fault detection. The DRV8814 can be powered
with a supply voltage between 8 V and 45 V and is capable of providing an output current up to 2.5 A full-scale.
A PHASE/ENBL interface allows for simple interfacing to the controller circuit. The winding current control allows
the external controller to adjust the regulated current that is provided to the motor. The current regulation is
highly configurable, with two decay modes of operation. Fast and slow decay can be selected depending on the
application requirements.
A low-power sleep mode is included which allows the system to save power when not driving the motor.
7.2 Functional Block Diagram
VM ^VM
V3P3OUT
3.3V
3.3V
AVREF
BVREF
APHASE
AENBL
AI0
AI1
BPHASE
BENBL
BI0
BI1
DECAY
nRESET
nSLEEP
nFAULT
Internal
Reference &
Regs
Thermal
Shut down
Int. VCC
LS Gate
Drive
Charge
Pump
HS Gate
Drive
CP1
0.01mF
CP2
VM
VCP
0.1mF
1MW
VM
VMA
Motor
Driver A
AOUT1
AOUT2
DCM
ISENA
Control
Logic
Motor
Driver B
VM
VMB
BOUT1
BOUT2
DCM
ISENB
GND
GND
8
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