DRV8829_15 Datasheet, PDF (8/27 Pages) Texas Instruments – DRV8829 5-A 45-V Single H-Bridge Motor Driver

DRV8829
SLVSA74E – MAY 2010 – REVISED SEPTEMBER 2015
7 Detailed Description
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7.1 Overview
The DRV8829 is an integrated motor driver solution for bipolar stepper motors or single/dual brushed-DC motors.
The device integrates an NMOS H-bridge and current regulation circuitry. The DRV8829 can be powered with a
supply voltage from 8.2 to 45 V, and is capable of providing an output current up to 5-A peak or 3.5-A rms.
Actual operable rms current will depend on ambient temperature, supply voltage, and PCP ground plane size.
A simple PH/EN interface allows easy interfacing to the controller circuit.
The current regulation is highly configurable, with several decay modes of operation. The decay mode can be
selected as a fixed slow, mixed, or fast decay.
A current scalar feature allows the controller to scale the output current without needing to scale the analog
reference voltage input VREF. The DAC is accessed using digital input pins. This allows the controller to save
power by decreasing the current consumption when not required.
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
0.1 µF _{VM VM}
+
0.1 µF bulk
VM
Power
VM
1 MŸ 0.1 µF
CP2
0.01 µF
CP1
1 mA ^V3P3OUT
0.47 µF
PHASE
ENBL
nSLEEP
nRESET
I[4:0]
DECAY
VREF
VREF
nFAULT
Charge
Pump
3.3-V LDO
Control
Inputs
3.3V
Analog
Inputs
Output
Core Logic
PWM
Gate
Drive
VM
Protection
AISEN
Overcurrent
Undervoltage
Thermal
VREF
I[4:0]
DAC
OUT1
OUT1
BDC
OUT2
OUT2
ISEN
R_SENSE
GND GND PPAD
8
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