Freescale Semiconductor, Inc.
Order this document from Analog Marketing: MC34923/D
Rev 0, 05/2003
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Preliminary Information
34923
Full-Bridge PWM Motor Driver
Designed with Motorola’s advanced SMARTMOS, the 34923 is designed for
pulse-width modulated (PWM) current control of DC motors. It is capable of
continuous output currents up to 2.0 A and operating voltages of up to 45 V.
Internal fixed off-time PWM current-control timing circuitry can be programmed
via a serial interface to operate in slow, fast, and mixed current-decay modes.
FULL-BRIDGE PWM MOTOR
DRIVER
DIR and PWM/ENABLE input pins are provided for use in controlling the
speed and direction of a DC motor with externally applied PWM-control
signals. The PWM/ENABLE input can be programmed via the serial port to
PWM the bridge in fast or slow current decay. Internal synchronous
rectification control circuitry is provided to reduce power dissipation during
PWM operation.
Internal circuit protection includes thermal shutdown with hysteresis and
crossover-current protection. A special power-up sequencing is not required.
Features
DW SUFFIX
24-LEAD SOICW
CASE 751E-04
• ±2.0 A, 45 V Continuous Output Rating
• Low RDS(ON) Outputs (270 mΩ, typical)
• Programmable Mixed, Fast, and Slow Current-Decay Modes
ORDERING INFORMATION
Temperature
• Serial Interface Controls Chip Functions
• Synchronous Rectification for Low Power Dissipation
• Internal Undervoltage Lockout Thermal Shutdown Circuitry
• Crossover-Current Protection
Device
Package
Range (T )
A
-40 to 125°C
24 SOICW
MC34923DW/R2
34923 Simplified Application Diagram
5.0 V
≤ 5.0 V
34923
PWMMODE
DIR
DCMA
PWM/ENABLE
Serial
Port
DC
MCU
CLOCK
DATA
Motor
STROBE
DCMB
OSC
GND
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
For More Information On This Product,
Go to: www.freescale.com
© Motorola, Inc. 2003