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MC34923DW bảng dữ liệu(PDF) 1 Page - Freescale Semiconductor, Inc

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
34923 Simplified Application Diagram
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
© Motorola, Inc. 2003
Order this document from Analog Marketing: MC34923/D
Rev 0, 05/2003
34923
Preliminary Information
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34923DW/R2
-40 to 125°C
24 SOICW
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.
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
• ±2.0 A, 45 V Continuous Output Rating
• Low RDS(ON) Outputs (270 m, typical)
• Programmable Mixed, Fast, and Slow Current-Decay Modes
• Serial Interface Controls Chip Functions
• Synchronous Rectification for Low Power Dissipation
• Internal Undervoltage Lockout Thermal Shutdown Circuitry
• Crossover-Current Protection
FULL-BRIDGE PWM MOTOR
DRIVER
DW SUFFIX
24-LEAD SOICW
CASE 751E-04
34923
5.0 V
≤ 5.0 V
Serial
Port
CLOCK
DATA
STROBE
PWMMODE
DIR
PWM/ENABLE
OSC
MCU
DCMA
DCMB
Motor
DC
GND
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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