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LMD18245TNSN/a600avai3A, 55V DMOS Full-Bridge Motor Driver


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LMD18245T
3A, 55V DMOS Full-Bridge Motor Driver
LMD18245
3A, 55V DMOS Full-Bridge Motor Driver
General Description

The LMD18245 full-bridge power amplifier incorporatesall
the circuit blocks requiredto drive and control currentina
brushed type DC motoror one phaseofa bipolar stepper
motor. The multi-technology process usedto buildthe device
combines bipolar and CMOS control and protection circuitry
with DMOS power switcheson the same monolithic struc-
ture. The LMD18245 controls the motor currentviaa fixed
off-time chopper technique.all DMOS H-bridge power stage delivers continuous out-
put currentsupto3A (6Apeak)at supply voltagesupto 55V.
The DMOS power switches feature low RDS(ON) for high
efficiency, anda diode intrinsicto the DMOS body structure
eliminates the discrete diodes typically requiredto clamp
bipolar power stages. innovative current sensing method eliminatesthe power
loss associated witha sense resistorin series withthe motor. four-bit digital-to-analog converter (DAC) providesa digital
pathfor controlling the motor current, and,by extension,
simplifies implementationof full, half and microstep stepper
motor drives. For higher resolution applications,an external
DAC canbe used.
Features
DMOS power stage ratedat 55V and3A continuous Low RDS(ON)of typically 0.3Ω per power switch Internal clamp diodes Low-loss current sensing method Digitalor analog controlof motor current TTL and CMOS compatible inputs Thermal shutdown (outputsoff)atTJ= 155˚C Overcurrent protection No shoot-through currents 15-lead TO-220 molded power package
Applications
Full, half and microstep stepper motor drives Stepper motor and brushedDC motor servo drives Automated factory, medical and office equipment
Functional Block and Connection Diagram

(15-Lead TO-220 Molded Power Package(T))
Order Number LMD18245T
SeeNS Package Number TA15A
Connection Diagram
April 1998
LMD18245
3A,
55V
DMOS
Full-Bridge
Motor
Driver
ic,good price


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