LMD18245T/NOPB

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1. DESCRIPTION

The LMD18245T/NOPB full-bridgeamplifierpowerincorporates all the circuit blocks required to driveand control current in a brushed type DC motor orof a bipolar stepper motor. The multi-one phase technology process used to build the devicecombines bipolar and CMOS control and protectioncircuitry with DMOS power switches on the samemonolithic structure. The LMD18245T/NOPB controls themotor current via a fixed offtime chopper techniqueAn all DMOS H-bridge power stage deliverscontinuous output currents up to 3A (6A peak) atsupply voltages up to 55V. The DMOS powerswitches feature low Rpson for high efficiency, and adiode intrinsic to the DMOS body structure eliminatesthe discrete diodes typically required to clamp bipolarpower stages. An innovative current sensing method eliminates thepower loss associated with a sense resistor in serieswith the motor. A four-bit digital-to-analog converter(DAC) provides a digital path for controlling the motorcurrent, and, by extension, simplifies implementationof full, half and microstep stepper motor drives. Forhigher resolution applications, an external DAC canbe used.

2. FEATURES

    1. DMOS Power Stage Rated at 55V and 3A Continuous

    2. Low RDS(ON) of Typically 0.3Ω per Power Switch

    3. Internal Clamp Diodes

    4. Low-loss Current Sensing Method

    5. Digital or Analog Control of Motor Current

    6. TTL and CMOS Compatible Inputs

    7. Thermal Shutdown (Outputs Off) at TJ = 155°C

    8. Overcurrent Protection

    9. No Shoot-Through Currents

  10. 15-lead Package

3. APPLICATIONS

    1. Full, Half and Microstep Stepper Motor Drives

    2. Stepper Motor and Brushed DC Motor Servo Drives

    3. Automated Factory, Medical and Office Equipment