34923

www.DataSheet4U.com Freescale Semiconductor, Inc. Order this document from Analog Marketing: MC34923/D Rev 0, 05/2003 MOTOROLA 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. Features ±2.0 A, 45 V Continuous Output Rating Low RDS(ON) Outputs (270 mΩ, 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 34923 FULL-BRIDGE PWM MOTOR DRIVER Freescale Se...