Date: 25th May 2011
New motor drivers from TI for stepper,
brushed DC motors handle up to 5 Amps
Texas Instruments Incorporated (TI) has expanded its DRV8x
motor driver family with eight new devices supporting up
to 5 A for higher-current bipolar stepper and brushed DC
motors. TI says the new DRV8x motor drivers provide RDS
(ON) of 100 milliohms, 60 percent less than the previous
generation, enabling 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.
Key features and benefits:
Bipolar stepper motor drivers: 2.5-A to 5-A peak current
options and control interfaces for phase-enable (PH/EN),
step/direction with indexer and pulse-width modulation (PWM)
control. Supports 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.
Brushed DC motor drivers: 2.5-A to 5-A peak current options
and control interfaces for PH/EN and PWM control. On-chip
cycle-by-cycle inrush protection limits start-up 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.
Advanced on-chip protection includes over-current, over-temperature,
shoot-through and under-voltage lockout.
DRV8x motor drivers integrate the gate drive circuitry,
MOSFETs, protection circuitry and current regulation circuitry.
Pin-for-pin compatibility with existing DRV8x motor drivers
provides flexibility for high or low current.
New additions to the DRV8x motor driver family include:
Bipolar stepper motor drivers
DRV8813: Up to 2.5 A with four levels of current regulation
and a PH/EN control interface.
DRV8825: Up to 2.5 A with on-chip indexer supporting up
to 32 microsteps.
DRV8829: Up to 5 A with 32 levels of current regulation
and a PH/EN control interface; two DRV8829 devices are required
to drive a single 5-A bipolar stepper motor.
Brushed DC motor drivers
DRV8814: Supports two 2.5-A brushed DC motors with cycle-by-cycle
inrush protection and a PH/EN control interface.
DRV8840: Up to 5 A with cycle-by-cycle inrush protection
and a PH/EN control interface.
Bipolar stepper or brushed DC motor drivers
DRV8841: Supports a single 2.5-A bipolar stepper motor or
two 2.5-A brushed DC motors with four levels of current
regulation, cycle-by-cycle inrush protection and a PWM control
interface supporting brake.
DRV8842: Supports a single 5-A brushed DC motor; two DRV8842
devices can also be used to drive a single 5-A bipolar stepper
motor; includes 32 level of current regulation, cycle-by
cycle inrush protection and a PWM control interface supporting
brake.
DRV8843: Supports a single 2.5-A bipolar stepper motor or
two 2.5-A brushed DC motors with four levels of current
regulation, cycle-by-cycle inrush protection and a PWM control
interface supporting brake and coast.
Availability: Now
Package: 9.7 mm x 6.4 mm HTSSOP package
Pricing: 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.
For more information visit www.ti.com
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