Overview
The LV8731V-MPB-H is a 2-channel H-bridge driver IC designed by onsemi, specifically tailored for driving stepper motors and brushed DC motors. This monolithic linear IC supports micro-step drive with a resolution of up to 1/16-step and is suitable for applications in office equipment and amusement industries. The IC incorporates a single-channel PWM current control stepper motor driver and a brushed motor driver, enabling forward, reverse, brake, and standby operations. It is fabricated using the BiCDMOS process, ensuring low on-resistance and efficient operation.
Key Specifications
| Parameter | Symbol | Unit | Max | Typ | Min | Conditions |
|---|---|---|---|---|---|---|
| Supply Voltage | VM max | V | 36 | VM, VM1, VM2 | ||
| Output Peak Current | IO peak | A | 2.5 | Tw ≤ 10 ms, duty 20%, Per 1ch | ||
| Output Current | IO max | A | 2 | Per 1ch | ||
| Logic Input Voltage High | VINh | V | 5.5 | 2.0 | ATT1, ATT2, EMM, RST/BLK, STEP/DC22, FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST | |
| Logic Input Voltage Low | VINl | V | 0.8 | 0 | ATT1, ATT2, EMM, RST/BLK, STEP/DC22, FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST | |
| Operating Temperature | Topr | °C | 85 | -40 | ||
| Storage Temperature | Tstg | °C | 150 | -55 | ||
| Allowable Power Dissipation | Pd max | W | 3.25 | Note 1 |
Key Features
- Micro-step Drive Capability: Supports full-step, half-step, quarter-step, and 1/16-step resolutions.
- PWM Constant-Current Control: Automatically exercises PWM constant-current chopping control for motor current.
- Low On-Resistance: Upper side: 0.3 Ω, Lower side: 0.25 Ω, Total: 0.55 Ω at TA = 25°C, IO = 2 A.
- Output Short-Circuit Protection: Selectable from latch-type or auto-reset-type protection.
- Unusual Condition Warning Output Pins: Provides monitoring and warning outputs for unusual conditions.
- No Control Power Supply Required: Internal regulator and charge pump circuits eliminate the need for an external control power supply.
- Forward/Reverse Switching Function: Allows switching between clockwise and counter-clockwise modes via the FR pin.
- Position Detection Monitoring: The MONI pin monitors the excitation position and indicates when it is in the initial position.
Applications
The LV8731V-MPB-H is ideally suited for various applications, including:
- Office equipment such as printers, scanners, and copiers.
- Amusement and gaming machines.
- Automated systems requiring precise motor control.
- Industrial automation and robotics.
Q & A
- What is the maximum supply voltage for the LV8731V-MPB-H?
The maximum supply voltage is 36 V.
- What are the supported micro-step resolutions?
The IC supports full-step, half-step, quarter-step, and 1/16-step resolutions.
- How is the output current controlled?
The output current is controlled using PWM constant-current chopping, set by the voltage input to the VREF pin and the resistance connected between RF and GND.
- What is the purpose of the MONI pin?
The MONI pin is used for position detection monitoring and indicates when the excitation position is in the initial state.
- Does the IC have built-in short-circuit protection?
Yes, the IC includes output short-circuit protection that can be set to either latch-type or auto-reset-type.
- What is the operating temperature range for the LV8731V-MPB-H?
The operating temperature range is from -40°C to 85°C.
- How is the forward/reverse direction controlled?
The direction is controlled by setting the FR pin to either high or low.
- Does the IC require an external control power supply?
No, the IC does not require an external control power supply due to its internal regulator and charge pump circuits.
- What is the maximum allowable power dissipation?
The maximum allowable power dissipation is 3.25 W.
- What are the typical applications for the LV8731V-MPB-H?
Typical applications include office equipment, amusement machines, and industrial automation systems.
