34923 Driver Datasheet

34923 Datasheet, PDF, Equivalent


Part Number

34923

Description

Full-Bridge PWM Motor Driver

Manufacture

Freescale Semiconductor

Total Page 16 Pages
Datasheet
Download 34923 Datasheet


34923
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Freescale Semiconductor, Inc.
MOTOROLA
Order this document from Analog Marketing: MC34923/D
Rev 0, 05/2003
SEMICONDUCTOR TECHNICAL DATA
Preliminary Information
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.
34923
FULL-BRIDGE PWM MOTOR
DRIVER
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
DW SUFFIX
24-LEAD SOICW
CASE 751E-04
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34923DW/R2 -40 to 125°C
24 SOICW
34923 Simplified Application Diagram
5.0 V
5.0 V
34923
MCU
Serial
Port
PWMMODE
DIR DCMA
PWM/ENABLE
CLOCK
DATA
STROBE
OSC
DCMB
GND
DC
Motor
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
© Motorola, Inc. 2003
For More Information On This Product,
Go to: www.freescale.com

34923
Freescale Semiconductor, Inc.
5.0 V
VDD
Bandgap
VDD
Thermal Shutdown
Undervoltage
and
Fault Detect
OSC
(160 kHz)
Charge
Pump
45 V
VBB
Bandgap
Regulator
VREG
PWMMODE
DIR
PWM/ENABLE
Control Logic
Gate
Drive
OSC
CLOCK
DATA
STROBE
SPAN
Programmable
PWM Timer
Fixed-Off
Blank
Decay
Serial Port
Zero
Current
Detect
Current
Sense
Sleep Mode
Reference
Buffer and
Divider
Figure 1. 34923 Simplified Block Diagram
DCMA
Motor
DCMB
SENSE
CS
RS
VREF
Load Current
Reference
34923
2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On This Product,
Go to: www.freescale.com


Features www.DataSheet4U.com Freescale Semicondu ctor, Inc. Order this document from Ana log Marketing: MC34923/D Rev 0, 05/2003 MOTOROLA SEMICONDUCTOR TECHNICAL DAT A Preliminary Information Full-Bridge PWM Motor Driver Designed with Motorola ’s advanced SMARTMOS, the 34923 is de signed for pulse-width modulated (PWM) current control of DC motors. It is cap able of continuous output currents up t o 2.0 A and operating voltages of up to 45 V. Internal fixed off-time PWM curr ent-control timing circuitry can be pro grammed via a serial interface to opera te in slow, fast, and mixed current-dec ay modes. DIR and PWM/ENABLE input pins are provided for use in controlling th e speed and direction of a DC motor wit h externally applied PWM-control signal s. The PWM/ENABLE input can be programm ed via the serial port to PWM the bridg e in fast or slow current decay. Intern al synchronous rectification control ci rcuitry is provided to reduce power dis sipation during PWM operation. Internal circuit protection includ.
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