DRV8811 Datasheet, PDF (8/19 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC

DRV8811
SLVS865D – SEPTEMBER 2008 – REVISED JULY 2009 ................................................................................................................................................. www.ti.com
FUNCTIONAL DESCRIPTION
PWM H-Bridge Drivers
DRV8811 contains two H-bridge motor drivers with current-control PWM circuitry, and a microstepping indexer. A
block diagram of the motor control circuitry is shown below.
RCA
VGD
VCP
PWM
Pre-
drive
OCP
VM
VMA
AOUT1
AOUT2
+
Step
Motor
–
+
–
OCP
A=8
ISENA
DAC
RCB
Control /
Indexer
Logic
VGD
VCP
PWM
Pre-
drive
OCP
OCP
A=8
VM
VMB
BOUT1
BOUT2
ISENB
DAC
DECAY
VREF
Figure 1. Block Diagram
8
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