A3985 is a dual full-bridge gate driver suitable for driving a wide range of higher power industrial bipolar 2- phase stepper motors or 2-phase brushless dc motors. It can also be used to drive two individual torque motors or solenoid actuators. Motor power is provided by external N-channel power MOSFETs at supply voltages from 12 to 50 V. Full digital control is provided by two serially-accessible registers that allow programming of off-time, blank-time, dead-time, mixed decay ratios, synchronous rectification, master clock source selection, and division ratio and idle mode. All internal timings are derived from a master clock that can be generated on-chip or provided by an external clock such as the system clock of the master controller. A programmable divider allows for a wide range of external system clock frequencies. The internal fixed off-time PWM current-control timing is programmed via the serial interface to operate in slow, fast, and mixed current-decay modes. The desired load-current level and direction is set via the serial port with a direction bit and two 6-bit linear DACs in conjunction with a reference voltage. The seven bits of control allow maximum flexibility in torque control
The A3985 is a flexible dual full-bridge gate driver suitable for driving a wide range of higher power industrial bipolar 2-phase stepper motors or 2-phase brushless DC motors. It features a serial interface for full digital control, allowing programming of off-time, blank-time, dead-time, mixed decay ratios, and synchronous rectification. Motor power is provided by external N-channel power MOSFETs at supply voltages from 12 to 50 V.
The device includes internal circuit protection such as thermal shutdown with hysteresis and undervoltage lockout. It is supplied in a 38-pin TSSOP package (suffix LD) with 100% matte tin leadframe plating. The component is designed for applications requiring precise current control and efficient operation.
| Supply Voltage Range | 12 to 50 V |
|---|---|
| Operating Ambient Temperature | -20 to 85 °C |
| Junction Temperature | 150 °C |
| Package Type | 38 pin TSSOP |
| Internal Oscillator Frequency | 4 MHz |
| Maximum Clock Input Frequency | 10 MHz |
The device operates with a supply voltage range from 12 to 50 V.
No, special power-up sequencing is not required for this component.