За управление на DC и стъпкови мотори - LMD18245 3A, 55V DMOS Full-Bridge Motor Driver

LMD18245  3A, 55V DMOS Full-Bridge Motor Driver 
За управление на DC  и стъпкови мотори

 National Semiconductor - LMD18245  3A, 55V DMOS
Драйвери за управление на DC и стъпкови мотори
Цена на дребно: 40 лв
Описание и технически параметри на линка LMD18245

Features

   DMOS power stage rated at 55V and 3A continuous

   Low R_DS(ON) of typically 0.3Ω per power switch

   Internal clamp diodes

   Low-loss current sensing method

   Digital or analog control of motor current

   TTL and CMOS compatible inputs

   Thermal shutdown (outputs off) at T_J = 155°C

   Overcurrent protection

   No shoot-through currents

   15-lead TO-220 molded power package 

Description

The LMD18245 full-bridge power amplifier incorporates all the circuit blocks required to drive and control current in a brushed type DC motor or one phase of a bipolar stepper motor. The multi-technology process used to build the device combines bipolar and CMOS control and protection circuitry with DMOS power switches on the same monolithic structure. The LMD18245 controls the motor current via a fixed off-time chopper technique.

An all DMOS H-bridge power stage delivers continuous output currents up to 3A (6A peak) at supply voltages up to 55V. The DMOS power switches feature low R_DS(ON) for high efficiency, and a diode intrinsic to the DMOS body structure eliminates the discrete diodes typically required to clamp bipolar power stages.

An innovative current sensing method eliminates the power loss associated with a sense resistor in series with the motor. A four-bit digital-to-analog converter (DAC) provides a digital path for controlling the motor current, and, by extension, simplifies implementation of full, half and microstep stepper motor drives. For higher resolution applications, an external DAC can be used.

Applications

Full, half and microstep stepper motor drives

Stepper motor and brushed DC motor servo drives

Automated factory, medical and office equipment

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