Overview
The L6219DS-T, produced by Allegro MicroSystems, is a dual full-bridge PWM motor driver designed to drive both windings of a bipolar stepper motor or bidirectionally control two DC motors. This driver is optimized for low output saturation voltage and includes internal pulse-width modulation (PWM) control of the output current up to 750 mA. The device features thermal protection circuitry, ground clamp and flyback diodes for protection against inductive transients, and internally generated delays to prevent crossover currents. It is supplied in a 24-pin surface-mountable SOIC package with 4 internally-fused leads for enhanced package power handling.
Key Specifications
| Characteristic | Symbol | Rating | Units |
|---|---|---|---|
| Motor Supply Voltage | VBB | 45 | V |
| Logic Supply Voltage | VCC | 7.0 | V |
| Logic Input Voltage Range | VIN | –0.3 to VCC+0.3 | V |
| Output Current, Peak | IOUT(pk) | 1.0 | A |
| Output Current, Continuous | IOUT | 750 mA | mA |
| Operating Ambient Temperature | TA | –20 to 85 | ºC |
| Maximum Junction Temperature | TJ(max) | 150 | ºC |
| Storage Temperature | Tstg | –55 to 150 | ºC |
| Package Thermal Resistance (RθJA) | RθJA | 77 (1-layer PCB with copper limited to solder pads) | ºC/W |
| Package Thermal Resistance (RθJA) | RθJA | 49 (1-layer PCB with 3.57 in.2 of copper area) | ºC/W |
| Package Thermal Resistance (RθJT) | RθJT | 6 | ºC/W |
Key Features
- Internal PWM control of output current up to 750 mA.
- Low output saturation voltage drop (less than 1.8 V total source plus sink at 500 mA).
- Two logic-level inputs (I0 and I1) for digital selection of motor winding current at 0%, 33%, 67%, or 100% of the maximum level.
- PHASE input to each bridge determines load current direction.
- Ground clamp and flyback diodes for protection against inductive transients.
- Internally generated delays prevent crossover currents when switching current direction.
- Thermal protection circuitry disables outputs if the chip temperature exceeds safe operating limits (170°C).
- 24-pin surface-mountable SOIC package with 4 internally-fused leads for maximum package power handling.
Applications
The L6219DS-T is suitable for driving both windings of bipolar stepper motors and bidirectionally controlling two DC motors. It is particularly useful in applications requiring precise control over motor current, such as in robotics, CNC machines, and other automated systems. The device's ability to handle high step rates and its thermal protection features make it ideal for high-performance motor control applications.
Q & A
- What is the maximum motor supply voltage for the L6219DS-T?
The maximum motor supply voltage is 45 V.
- What is the continuous output current rating of the L6219DS-T?
The continuous output current rating is 750 mA, but it may be limited by duty cycle, ambient temperature, and heat sinking.
- How does the L6219DS-T control output current?
The output current is controlled by an external sense resistor (RS), internal comparator, and monostable multivibrator, with the maximum output current determined by user selection of a reference voltage and sensing resistor.
- What are the logic input levels for selecting output current limits?
Two logic-level inputs (I0 and I1) allow digital selection of motor winding current at 0%, 33%, 67%, or 100% of the maximum level.
- Does the L6219DS-T require special power-up sequencing?
No, special power-up sequencing is not required.
- What type of protection does the L6219DS-T have against inductive transients?
The device includes ground clamp and flyback diodes for protection against inductive transients.
- How does the thermal protection circuitry work?
The thermal protection circuitry disables the outputs if the chip temperature exceeds 170°C and re-enables them when the temperature cools to 145°C.
- What is the package type of the L6219DS-T?
The device is supplied in a 24-pin surface-mountable SOIC package with 4 internally-fused leads.
- What are the typical applications of the L6219DS-T?
The device is suitable for driving bipolar stepper motors and bidirectionally controlling two DC motors, particularly in robotics, CNC machines, and other automated systems.
- How does the PHASE input affect the motor current direction?
The PHASE input to each bridge determines the direction of the motor winding current.
