Overview
The L6235D device, produced by STMicroelectronics, is a DMOS fully integrated 3-phase motor driver designed for driving 3-phase brushless DC (BLDC) motors. It is realized in BCD (Bipolar, CMOS, DMOS) technology, combining isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. This integration includes all the necessary circuitry for driving a 3-phase BLDC motor, such as a 3-phase DMOS bridge, a constant off-time PWM current controller, and decoding logic for single-ended hall sensors.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Supply Voltage | 8 to 52 V |
| Output Peak Current | 5.6 A |
| DC Output Current | 2.8 A |
| RDS(ON) | 0.3 Ω (typical at Tj = 25 °C) |
| Operating Frequency | Up to 100 kHz |
| Package Options | SO24, PowerSO36 |
| Operating Temperature Range | -40 to 150 °C |
Key Features
- Non-dissipative overcurrent detection and protection
- Diagnostic output
- Constant off-time PWM current controller
- Slow decay synchronous rectification
- 60° and 120° hall effect decoding logic
- Brake function
- Tachometer output for speed loop
- Cross conduction protection
- Thermal shutdown
- Undervoltage lockout
- Integrated fast freewheeling diodes
Applications
The L6235D is suitable for a variety of applications involving 3-phase BLDC motors, including but not limited to:
- Industrial automation
- Robotics
- Aerospace
- Automotive systems
- Medical devices
- Consumer electronics requiring high-efficiency motor control
Q & A
- What is the operating supply voltage range of the L6235D?
The operating supply voltage range is from 8 to 52 V. - What is the maximum output peak current of the L6235D?
The maximum output peak current is 5.6 A. - What is the typical RDS(ON) value of the L6235D at 25 °C?
The typical RDS(ON) value is 0.3 Ω. - What are the package options available for the L6235D?
The package options are SO24 and PowerSO36. - Does the L6235D have overcurrent protection?
Yes, it features non-dissipative overcurrent detection and protection. - What is the purpose of the tachometer output in the L6235D?
The tachometer output is used for developing a speed control loop by converting the frequency of the hall effect signal into a voltage proportional to the motor speed. - How does the L6235D protect against cross conduction?
The device implements cross conduction protection using a deadtime (typically 1 µs) set by an internal timing circuit. - What is the operating frequency range of the L6235D?
The operating frequency range is up to 100 kHz. - Does the L6235D have thermal shutdown?
Yes, it includes thermal shutdown protection. - What types of hall effect sensor configurations does the L6235D support?
The device supports 60° and 120° hall effect decoding logic.
