LMD18245 - 3A，55V DMOS 全桥电机驱动器

LMD18245是TI德州仪器公司的一款运动/电机控制产品，LMD18245是3A，55V DMOS 全桥电机驱动器，本站介绍了LMD18245的封装应用图解、特点和优点、功能等，并给出了与LMD18245相关的TI元器件型号供参考。

LMD18245 - 3A，55V DMOS 全桥电机驱动器 - 运动/电机控制 - 电源管理特殊功能 - 德州仪器

产品描述

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 RDS(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.

产品特性

DMOS Power Stage Rated at 55V and 3A Continuous
Low RDS(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 TJ = 155°C
Overcurrent Protection
No Shoot-Through Currents
15-lead Package

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