LMD18245T

TEXAS INSTRUMENTS  LMD18245T  芯片, 半桥 3A 55V

The is a 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 structure. It 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-analogue converter DAC provides a digital path for controlling the motor current and by extension.

.

DMOS power stage rated at 55V and 3A continuous

.

Low RDS ON of typically 0.3R per power switch

.

Internal clamp diodes

.

Low-loss current sensing method

.

Digital or analogue control of motor current

.

TTL and CMOS compatible inputs

.

Thermal shutdown outputs off at TJ = 155°C

.

Overcurrent protection

.

No shoot-through currents

.

For higher resolution applications, an external DAC can be used

Device has limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.