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LMD18245 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMD18245 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  LMD18245 3A, 55V DMOS Full-Bridge Motor Driver General Description 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 struc- ture. The LMD18245 controls the motor current via a fixed off-time chopper technique. An all DMOS H-bridge power stage delivers continuous out- put currents up to 3A (6A peak) at supply voltages up to 55V. The DMOS power switches feature low R DS(ON) for high ef- ficiency, and a diode intrinsic to the DMOS body structure eliminates the discrete diodes typically required to clamp bi- polar 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, sim- plifies implementation of full, half and microstep stepper mo- tor drives. For higher resolution applications, an external DAC can be used. Features n DMOS power stage rated at 55V and 3A continuous n Low R DS(ON) of typically 0.3Ω per power switch n Internal clamp diodes n Low-loss current sensing method n Digital or analog control of motor current n TTL and CMOS compatible inputs n Thermal shutdown (outputs off) at T J = 155˚C n Overcurrent protection n No shoot-through currents n 15-lead TO-220 molded power package Applications n Full, half and microstep stepper motor drives n Stepper motor and brushed DC motor servo drives n Automated factory, medical and office equipment Functional Block and Connection Diagram (15-Lead TO-220 Molded Power Package (T) ) DS011878-1 Order Number LMD18245T See NS Package Number TA15A April 1998 © 1998 National Semiconductor Corporation DS011878 www.national.com |
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