Overview
The L6208N, produced by STMicroelectronics, is a DMOS fully integrated stepper motor driver designed to drive two-phase bipolar stepper 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 device includes all the necessary circuitry for stepper motor control, such as a dual DMOS full bridge, constant off-time PWM current controllers, and a phase sequence generator. The L6208N is available in PowerSO36 and SO24 packages, offering robust features like non-dissipative overcurrent protection and thermal shutdown.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Supply Voltage | 8 | - | 52 | V |
| Output Peak Current | - | - | 5.6 A | A |
| RMS Output Current | - | - | 2.8 A | A |
| RDS(ON) High-Side Switch | - | 0.3 | 0.4 | Ω |
| Operating Frequency | - | - | 100 KHz | Hz |
| Thermal Shutdown Temperature | - | - | 165 | °C |
| Maximum Thermal Resistance Junction-Pins (SO24) | - | - | 14 | °C/W |
| Maximum Thermal Resistance Junction-Ambient (SO24, with heat sinking) | - | - | 15 | °C/W |
Key Features
- Non-dissipative overcurrent protection on high-side power MOSFETs
- Dual independent constant off-time PWM current controllers
- Fast/slow decay mode selection
- Fast decay quasi-synchronous rectification
- Decoding logic for stepper motor full and half step drive
- Cross conduction protection
- Thermal shutdown
- Undervoltage lockout
- Integrated fast freewheeling diodes
- TTL/CMOS compatible logic inputs
Applications
The L6208N is primarily used for driving bipolar stepper motors in various applications, including:
- Industrial automation and control systems
- Medical equipment
- Printers and plotters
- Robotic systems
- Automotive systems requiring precise motor control
Q & A
- What is the operating supply voltage range of the L6208N?
The operating supply voltage range is from 8 to 52 V.
- What is the maximum output peak current of the L6208N?
The maximum output peak current is 5.6 A.
- What is the typical RDS(ON) value of the high-side switch at 25°C?
The typical RDS(ON) value is 0.3 Ω.
- What is the maximum operating frequency of the L6208N?
The maximum operating frequency is up to 100 KHz.
- Does the L6208N have thermal shutdown protection?
- What types of decay modes does the L6208N support?
The L6208N supports fast and slow decay modes.
- How does the L6208N protect against cross conduction?
The L6208N includes cross conduction protection to prevent simultaneous conduction of the high and low side MOSFETs.
- What logic input compatibility does the L6208N have?
The L6208N has TTL/CMOS compatible logic inputs.
- What is the purpose of the phase sequence generator in the L6208N?
The phase sequence generator is a state machine that provides the phase and enable inputs for the two bridges to drive a stepper motor in either full step or half step modes.
- What are the available packages for the L6208N?
The L6208N is available in PowerSO36 and SO24 packages.
