The 3959 DMOS FULL-BRIDGE PWM MOTOR DRIVER is a power integrated circuit produced by Allegro Semiconductor. This device supports ±3 A output current and 50 V operating voltage, and the internal fixed PWM current control timing circuit can be adjusted through control inputs to operate in slow, fast and mixed current decay modes. The PHASE and ENABLE input terminals are used to control the speed and direction of a dc motor with externally applied PWM-control signals. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of supply and charge pump, and crossover-current protection. No special power-up sequencing is required. The A3959SB/SLB/SLP is a choice of three power packages, a 24-pin plastic DIP with a copper batwing tab (package suffix ‘B’), a 24-lead plastic SOIC with a copper batwing tab (package suffix ‘LB’), and a thin (<1.2 mm) 28-lead plastic TSSOP with an exposed thermal pad (suffixed ‘T’).
The Allegro A3959 is a DMOS full-bridge PWM motor driver designed for pulse-width modulated current control of DC motors. It supports output currents up to +3 A and operating voltages up to 50 V. The device features internal fixed off-time PWM current-control timing circuitry that can be adjusted to operate in slow, fast, and mixed current-decay modes. It includes internal synchronous rectification control to reduce power dissipation and offers protection features such as thermal shutdown with hysteresis, undervoltage monitoring, and crossover-current protection. The component is available in three power packages: 24-pin plastic DIP, 24-lead plastic SOIC, and 28-lead plastic TSSOP.
| Output Current | +3 A |
|---|---|
| Operating Voltage | 50 V |
| Output On Resistance | 270 mΩ |
| Operating Temperature Range | -20°C to +85°C |
| Junction Temperature | +150°C |
| Internal Oscillator Frequency | 4.25 MHz |
The device supports slow, fast, and mixed current-decay modes.
The typical internal oscillator frequency is 4.25 MHz.
No, special power-up sequencing is not required.