UDN2936W

The UDN2936W has the following features including 10 V to 45 V Operation;±3 A Peak Output Current;Internal Clamp Diodes;Internal PWM Current Control; 60° or 120° Commutation Decoding Logic;Thermal Shutdown Protection;Compatible with Single-Ended or Differential Hall-Effect Sensors; Braking and Direction Controls.

Combining logic and power, the UDN2936W provides commutation and drive for three-phase brushless do motors.Each of the three outputs are rated at 45 V and 2 A (13 A peak), and include internal ground clamp and flyback diodes. These drivers also feature internal commutation logic, PWM current control, and thermal shutdown protection.The UDN2936W is compatible with singleended digital or linear Hall effect sensors. The commutating logic is programmed for 60° (UDN2936W)  electrical separation. Current control is accomplished by sensing current through an external sense resistor and pulse-width modulating the source drivers. Voltage thresholds and hysteresis can be externally set by the user. If desired, internal threshold and hysteresis defaults (300 mV, 7.5 percent) can be used. The UDN2936W/W-120 also include braking and direction control. Internal protection circuitry prevents crossover current when braking or changing direction.For maximum power-handling capability, the UDN2936W and is supplied in 12-pin single in-line power-tab packages. An external heat sink may be required for high-current applications. The tab is at ground potential and needs no insulation.

A logic low on the BRAKE pin turns ON the three sink drivers and turns OFF the three source drivers, essentially shorting the motor windings to ground. During braking,the back-electromotive force generated by the motor produces a current that dynamically brakes the motor.Depending upon the rotational velocity of the motor, this current can approach the locked rotor current level (which is limited only by the motor winding resistance). During braking, the output current-limiting circuitry is disabled and care should be taken to ensure that the back-EMF generated brake current does not exceed the maximum rating (3 A peak) of the sink drivers and ground clamp diodes.