UDS2953V

The UDS2953V has the following features including ±2A Output Current;Output Voltage to 50 V;Internal Flyback Diodes;Output Current Sensing;Internal Thermal Shutdown Circuitry;Crossover-Current Protected;Hermetically Sealed Package;High-Reliability Screening.

Designed for bidirectional control of do or stepper motors, the UDS2953V is rated for continuous output currents to ±2 A. For pulse-width modulated(chopped mode operation, the output current is determined by the user's selection of a reference voltage and sensing resistor while the OFF pulse duration is set by an external RC timing network. Extensive internal circuit protection includes thermal shutdown with hysteresis, output suppression diodes to protect the bridges from the transients generated wnen switching inductive loads, and crossover current protection. Reverse-bias burn-in and 100% high-reliability screening to MIL-STD-883, Class B are standard.The UDS2953V is supplied in a 15-pin, flange-moult MO-097AA style hermetic package for improved power dissipation capabilities. An external heatsink is required for high-current applicatins.The flange is at ground potential and normally needs no Isolation.Fault conditions which produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated, but should be avoided.Output current rating may be restricted to a value determined by system concerns and factors.These include: system duty cycle and timing,ambient temperature, and use of any heatsinking and/or forced cooling. Far reliable operation the specified maximum junction temperature should not be exceeded.

The UDS2953V full-bridge driver is ideal fordriving 2-phase bipolar stepper, bidirectional do servo, and brushless do motors with various pulse-width modulation (PWM) current-control formats, Output current is controlled by,using an external sense resistor and an optionaL.RC nerwork and reference voltage for an internal fixed-frequency PWM circuit, or by using an external PWM source.Average load current can also be adjusted:by external pulse-width modulation using the OUTPUT ENABLE pin.Toggling fhe OUTPUT ENABLE line shuts OFF both the source and sink drivers.

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