Overview
The LMD18245T/NOPB is a 3A, 55V DMOS full-bridge motor driver produced by Texas Instruments. This device is designed to control and drive brushed DC motors or one phase of bipolar stepper motors. It incorporates all the necessary circuit blocks for motor current control, including a DMOS power stage, current sensing, and protection circuitry. The LMD18245T/NOPB uses a fixed off-time chopper technique to regulate motor current, ensuring efficient and reliable operation.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Continuous Load Current | 3A | A |
| Peak Load Current | 6A | A |
| Supply Voltage Range | 12V to 55V | V |
| Output Voltage | Up to 55V | V |
| Junction Temperature (TJ(max)) | +150°C | °C |
| Power Dissipation (TO-220, TA = 25°C, Infinite Heatsink) | 25W | W |
| ESD Susceptibility | 1500V | V |
| Storage Temperature Range | −40°C to +150°C | °C |
| Lead Temperature (Soldering, 10 seconds) | 300°C | °C |
| RDS(ON) per Power Switch | Typically 0.3Ω | Ω |
| Current Sense Linearity Error | ±6% to ±9% (max) | % |
Key Features
- DMOS power stage rated at 55V and 3A continuous current (6A peak)
- Low RDS(ON) of typically 0.3Ω per power switch
- Internal clamp diodes for voltage transient protection
- Low-loss current sensing method eliminating resistor power loss
- Digital or analog control of motor current
- TTL and CMOS compatible inputs
- Fixed off-time chopper technique for motor current regulation
- Undervoltage lockout and overcurrent protection
- 15-Lead TO-220 power package (NDL)
Applications
The LMD18245T/NOPB is suitable for a variety of applications, including:
- Brushed DC motor control
- Bipolar stepper motor control
- Industrial automation and robotics
- Automotive systems requiring high-current motor control
- Medical devices and equipment
- Consumer electronics with motorized components
Q & A
- What is the continuous load current rating of the LMD18245T/NOPB?
The continuous load current rating is 3A, with a peak load current of 6A.
- What is the supply voltage range for the LMD18245T/NOPB?
The supply voltage range is from 12V to 55V.
- What type of motor control does the LMD18245T/NOPB support?
The device supports brushed DC motor control and bipolar stepper motor control.
- What is the RDS(ON) of the power switches in the LMD18245T/NOPB?
The RDS(ON) is typically 0.3Ω per power switch.
- Does the LMD18245T/NOPB have built-in protection features?
Yes, it includes undervoltage lockout and overcurrent protection.
- What is the package type of the LMD18245T/NOPB?
The device is packaged in a 15-Lead TO-220 power package (NDL).
- How does the LMD18245T/NOPB regulate motor current?
The device uses a fixed off-time chopper technique to regulate motor current.
- Is the LMD18245T/NOPB compatible with TTL and CMOS inputs?
Yes, it is compatible with both TTL and CMOS inputs.
- What is the maximum junction temperature for the LMD18245T/NOPB?
The maximum junction temperature is +150°C.
- What is the storage temperature range for the LMD18245T/NOPB?
The storage temperature range is from −40°C to +150°C.
