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Motor drivers offer 60% lower RDS(on)

Posted: 01 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:motor driver? bipolar stepper? brushed DC motors?

Texas Instruments Inc. has expanded its DRV8x motor driver family with eight new devices. The devices support up to 5A for higher-current bipolar stepper and brushed DC motors. The new DRV8x motor drivers provide RDS(on) as low as 100m?, which is more than 60 percent less than the previous generation. This, according to TI, enables higher current and better thermal performance.

Microstepping options within the family include up to 256 microsteps and greater with an external microcontroller or up to 32 microsteps with an on-chip indexer.

The bipolar stepper motor drivers feature 2.5C5A peak current options and control interfaces for phase-enable (PH/EN), step/direction with indexer and pulse-width modulation (PWM) control. They support 1/256 and greater microstepping, along with slow, mixed and fast decay modes, for smooth, quiet, high-resolution motion profiles in applications such as printers, scanners, security cameras, cash handlers, medical equipment and factory automation.

The brushed DC motor drivers feature 2.5C5A peak current options and control interfaces for PH/EN and PWM control. On-chip cycle-by-cycle inrush protection limits startup and stall currents, protecting the driver and reducing overall system cost in a variety of applications, such as printers, robotics, toys, servo motors, textile manufacturing equipment, solenoid valves and consumer electronics.

The DRV8x motor drivers integrate gate drive circuitry, MOSFETs, protection circuitry and current regulation circuitry to reduce design complexity, board space and time to market compared to discrete solutions.

An evaluation module, including schematics, gerbers, graphical user interface for setup, and all necessary cabling and software, is available for each of the eight new motor drivers for a suggested retail price of $149.

The new DRV8x motor drivers are available today in a 9.7x6.4mm HTSSOP package. All are priced at $2.25 in 1,000-unit quantities with the exception of the DRV8825, which is available for $2.40 for 1,000 units.

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