LMD18245T/NOPB

Product Summary

The LMD18245T is a full-bridge power amplifier which 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 structure. The LMD18245T 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 switch LMD18245T features 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. The applications of the LMD18245T include Full, half and microstep stepper motor drives, Stepper motor and brushed DC motor servo drives and Automated factory, medical and office equipment.

Parametrics

LMD18245T absolute maximum ratings: (1)DC Voltage at: OUT 1, VCC, and OUT 2: +60V; (2)COMP OUT, RC, M4, M3, M2, M1, BRAKE: +12V; (3)DC Voltage PGND to SGND: 400mV; (4)Continuous Load Current: 3A; (5)Peak Load Current: 6A; (6)Junction Temperature (TJ(max)): +150°C; (7)Power Dissipation : TO-220 (TA = 25°C; Infinite Heatsink): 25W; TO-220 (TA = 25°C, Free Air): 3.5W; (8)ESD Susceptibility: 1500V; (9)Storage Temperature Range (TS): -40°C to +150°C; (10)Lead Temperature (Soldering, 10 seconds): 300°C.

Features

LMD18245T features: (1)DMOS power stage rated at 55V and 3A continuous; (2)Low RDS(ON) of typically 0.3W per power switch; (3)Internal clamp diodes; (4)Low-loss current sensing method; (5)Digital or analog control of motor current; (6)TTL and CMOS compatible inputs; (7)Thermal shutdow(outputs off) at TJ = 155°C; (8)Overcurrent protection; (9)No shoot-through currents; (10)15-lead TO-220 molded power package.

Diagrams