UDN2943Z

Designed for use as a general-purpose motor driver, the UDN2943Z half-bridge driver combines high-current sink and source drivers with logic stages, level shifting, diode transient protection, and a voltage regulator for single-supply operation. Capable of operating in extremely harsh environments, this device can withstand high ambient temperatures, output overloads, and repeated power supply transient voltages without damage. The driver can be used in pairs for full-bridge operation, or as triplets in three-phase brushless dc motordrive applications.

The input circuitry is compatible with TTL, low-voltage CMOS, and NMOS logic. Logic lockout prevents both source and sink drivers from turning ON simultaneously. Each driver is turned ON by an activelow input, making the UDN2943Z especially desirable in many microprocessor applications. An accidental input open circuit will turn OFF the corresponding output. The device also provides an internallygenerated dead time to prevent crossover currents during output switching. Monolithic, space-saving construction offers reliability unobtainable with discrete components.

Saturated output drivers provide for low saturation voltage at the maximum rated current. Internal short-circuit protection, activated at load currents above 1 A, protects the source driver from accidental short-circuits between the output and ground.

The UDN2943Z driver is rated for continuous operation with inductive loads at supply voltages of up to 24 V. With supply voltage transients (to 35 V maximum), a high-voltage protection circuit becomes operative, shutting OFF both output drivers. The internal thermal shutdown is triggered by a nominal junction temperature of 160°C.

Single-chip construction and a 5-lead power-tab TS-001 plastic package provide cost-effective and reliable systems designs.

It also features excellent power dissipation ratings, minimum size, and ease of installation. The heat-sink tab is at ground potential and does not require insulation.