Overview
The L6227PD, produced by STMicroelectronics, is a DMOS dual full bridge driver designed for motor control applications. It is realized in BCD (Bipolar, CMOS, DMOS) technology, combining isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. This device is particularly suited for controlling bipolar stepper motors and dual DC motors. It features advanced protection mechanisms and current control capabilities, making it a robust solution for various motor control needs.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Supply Voltage (VS) | 8 | - | 52 | V |
| Output Peak Current | - | 2.8 A | - | A |
| RDS(ON) at Tj = 25 °C | - | 0.73 Ω | - | Ω |
| Operating Frequency | - | - | 100 KHz | - |
| RMS Output Current | - | - | 1.4 A | A |
| Storage and Operating Temperature Range | -40 | - | 150 | °C |
| Thermal Shutdown Temperature | - | 165 | - | °C |
Key Features
- Operating supply voltage from 8 to 52 V
- 2.8 A output peak current (1.4 A DC)
- Non-dissipative overcurrent protection
- Dual independent constant tOFF PWM current controllers
- Slow decay synchronous rectification
- Cross conduction protection
- Thermal shutdown
- Undervoltage lockout
- Integrated fast freewheeling diodes
Applications
- Bipolar stepper motor control
- Dual DC motor control
Q & A
- What is the operating supply voltage range of the L6227PD?
The operating supply voltage range is from 8 to 52 V.
- What is the peak output current of the L6227PD?
The peak output current is 2.8 A, with a DC current of 1.4 A.
- What type of overcurrent protection does the L6227PD have?
The L6227PD features non-dissipative overcurrent protection.
- Does the L6227PD have thermal shutdown protection?
Yes, the device has thermal shutdown protection that activates at a junction temperature of 165 °C.
- What is the purpose of the PWM current controllers in the L6227PD?
The PWM current controllers regulate the motor current by sensing the voltage drop across an external sense resistor and adjusting the bridge's operation accordingly.
- How does the slow decay mode work in the L6227PD?
In slow decay mode, when the lower power MOS is switched off, the current recirculates around the upper half of the bridge, allowing the current to decay slowly.
- What is the maximum thermal resistance junction-ambient of the L6227PD?
The maximum thermal resistance junction-ambient is 78 °C/W when mounted on a multilayer FR4 PCB without any heat sinking surface.
- How does the cross conduction protection work in the L6227PD?
Cross conduction protection is achieved using a deadtime (typically 1 μs) between the switch off and switch on of two power MOS in one leg of a bridge.
- What is the recommended capacitor value for high frequency filtering on the power supply?
A high-quality ceramic capacitor in the range of 100 to 200 nF is recommended.
- How should the sense resistors be connected and what type should they be?
The sense resistors should be connected with a trace length as short as possible and should be non-inductive resistors to minimize di/dt transients.
