LMD18245 Datasheet | National Semiconductor

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 bines bipolar and CMOS control and protection circuitry with DMOS power switches on the same monolithic structure. The LMD18245 controls the motor current via a fixed off-time chopper technique. An all DMOS H-bridge power stage delivers continuous output currents up to 3A (6A peak) at supply voltages up to 55V. The DMOS power switches feature low RDS(ON) for high efficiency, and a diode intrinsic to the DMOS body structure eliminates the discrete diodes typically required to clamp bipolar 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, simplifies implementation of full, half and microstep stepper motor drives. For higher resolution applications, an external DAC can be used. Features n n n n n n n n n n DMOS power stage rated at 55V and 3A continuous Low RDS(ON) of typically 0.3Ω per power switch Internal clamp diodes Low-loss current sensing method Digital or analog control of motor current TTL and CMOS patible inputs Thermal shutdown (outputs off) at TJ = 155˚C Overcurrent protection No shoot-through currents 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 © 1998 National Semiconductor Corporation DS011878 .national. Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please...