Overview
The LMD18245T is a full-bridge power amplifier designed by Texas Instruments, specifically tailored for driving and controlling brushed DC motors or one phase of bipolar stepper motors. This component integrates multiple technologies, including bipolar and CMOS control circuits alongside DMOS power switches, all on a single monolithic structure. It is particularly suitable for applications requiring efficient and reliable motor control, such as in robotics, automation, and precision machinery.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Maximum Supply Voltage | 55 | V | |
| Continuous Output Current | 3 | A | |
| Peak Output Current | 6 | A | |
| Logic Circuit Voltage | 12 | V | |
| Minimum Input Pulse Width | 2 | μs | |
| Current Sensor Linear Error | ±9 | % |
Key Features
- Integrated DMOS H-bridge power stage for high efficiency.
- Fixed off-time chopper technique for motor current control.
- Four-bit digital-to-analog converter (DAC) for digital current control.
- Built-in protection circuits including overcurrent, thermal, and undervoltage protection.
- Eliminates the need for external sense resistors, reducing power loss.
Applications
The LMD18245T is widely used in various fields such as industrial automation, robotics, and consumer electronics. Its robust design and integrated features make it ideal for applications requiring precise motor control and high reliability. Specific uses include CNC machinery, automated guided vehicles (AGVs), and precision medical devices.
Q & A
1. What is the maximum supply voltage for the LMD18245T?
The maximum supply voltage is 55V.
2. What is the continuous output current capability?
It can handle continuous output currents up to 3A.
3. Can this IC drive stepper motors?
Yes, it can drive one phase of a bipolar stepper motor.
4. What protection features are included?
It includes overcurrent, thermal, and undervoltage protection.
5. How does the LMD18245T control motor current?
It uses a fixed off-time chopper technique.
6. Is an external sense resistor needed for current sensing?
No, it eliminates the need for external sense resistors.
7. What is the role of the four-bit DAC in this IC?
The DAC provides a digital path for controlling the motor current.
8. What is the peak output current?
The peak output current is 6A.
9. What is the logic circuit voltage?
The logic circuit voltage is 12V.
10. What is the minimum input pulse width?
The minimum input pulse width is 2μs.
