UDS2936V

The UDS2936V has the following features including 10 V to 45 V Operation;12 A Output Current;Internal Clamp Diodes;Internal PWM Current Control;60°Commutation Decoding Logic;Internal Thermal Shutdown Circuitry;Compatible with Digital, Open-Collector Hall Effect-Sensors;Braking and Direction Control;Hermetically Sealed Package;High-Reliability Screening.

The UDS2936V combines logic and power to provide commutation and drive for a three-phase brushless dc motor.Each of the three push-pull outputs are rated at 45V and ±2A(±2.3A peak),and have internal inductive-load transient suppression diodes.The driver also includes PWM current control and thermal shutdown protection. Reverse-bias burn-in and 100% high-reliability screening to MIL-STD-883, Class Bare standard.The UDS2936V is compatible withsingle-ended digitatorlinear Hall effect sensors and is programmed for 60°electrical_separation(other separation sequences, such as 120°,are available).Current control is accomplished by sensing current througn an extternal resistor and pulse-width modulating the source drives.voltage thresholds and hysteresis can be externally set by the user. If desired, internal thresh-old and hysteresis defaults (300 mV, 7.5%) can be used. Internal protection circuitry prevents crossover currentwhen baking or changing direction. The UDS2938V differs from its commercial Version(UDN2936W);the output emitters are separated from the current sensor rnput, mus anowrng increases versatility in control techniques.The UDS2936V is supplied in a 15-pin, flange-mount MO-097AA style hermetic package for improved power dissipation capablilitles. An external heatsink is required for high-current applications: The flange is at ground potential and normally needs no isolation.

Motor current is internally controlled by pulse-width modulating the source drivers with a preset hysteresis format.Load current through an external sense resistor(Rs) is constantly monitored.When the current reaches the set trip point(determined by an external reference voltage or internal default), the source driver is disabled.The actual load current will peak slightly higher because of the internal logic and switching delays. Current recirculakes through the ground clamp diode,motor winding, and sink driver. An internal constant-current sink reduces the trip current(hysteresis). When the decaying current reaches this lower threshold,the source driver is enabled again and the cycle repeats.