A4980: programmable stepper drive car

A4980 is a flexible, micro step motor driver with built-in converter, easy to operate.It USES a single chip solutions, able to form a full step, half step, step into a quarter and 16 points model driven bipolar stepper motor, working voltage and current can be up to 28 V and + 750 mA.A4980 can use simple step by step and direction input or through SPI compatible interface control, but also can be used to set up a variety of diagnostic information integration function and read.

Through programming, the current regulator can work at a fixed downtime or fixed frequency PWM, and through a variety of attenuation model to reduce the audible noise of the motor and improving accuracy step by step.And phase current meter can through serial interface programming, for a particular application set up suitable micro stepping current distribution, further improve the performance of the motor.

All phase current of motor through the DMOS full bridge device control, using synchronous rectifier, reduce the power dissipation.On the high side when switching between drive and low side drive, internal circuit and timer can prevent the transconductance and breakdown,

To avoid the output short circuit.In addition, it also has a low load current and rotor stall detection.Chip level protection include: the high and low temperature warning, thermal shutdown, over-voltage and under-voltage lockout.

application

• Stepper motor car
• Engine management
• The headlights positioning

• Typical application + 750 mA, 28 V
• Low R_{DS (open)}Output, average 0.5 Ω current source and irrigation
• Automatic current attenuation pattern detection/choice
• Mixture, fast and slow current attenuation model
• Synchronous rectifier, reduce power dissipation
• Internal overvoltage lock (OVLO), under-voltage lockout (UVLO) and hot shutdown circuit
• Cross current protection
• Short circuit and open circuit diagnosis
• High and low temperature warning
• Stall detection
• SPI compatible type or simple step by step and direction control
• Through the SPI compatible type serial interface improving configurability