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Related Links:

Datasheets:
2547: Protected Quad Power Drivers (PDF)

Selection Guides:
Automotive ICs,

Relay/Solenoid Drivers

when this product is updated

Technical Publications:
A Primer on Driving Incandescent Lamps (PDF)

UDx2547
Protected Quad Power Drivers

These parts have been phased out of production as of October 31, 2005. Samples are no longer available.

Features

• Output SOA Protection
• Low Output-Saturation Voltage
• Diagnostic FAULT Output
• TTL and 5 V CMOS Compatible Inputs
• Independent Over-Current Protection for Each Driver
• Independent Thermal Protection for Each Driver
• 600 mA Output Current per Channel

Description

Providing interface between low-level logic and power loads, the UDK/UDN/UDQ2547B and UDK/UDN/UDQ2547EB quad power drivers combine logic gates and high-current bipolar outputs with complete output protection. Each of the four outputs will sink 600 mA in the ON state. The outputs have a minimum breakdown voltage (load dump) of 60 V and a sustaining voltage of 40 V. The inputs are compatible with TTL and 5 V CMOS logic systems and include internal pull-down resistors to ensure that the outputs remain OFF if the inputs are open-circuited.

Over-current protection for each channel has been designed into these devices and is activated at approximately 1.3 A. It protects each output from short circuits with supply voltages up to 25 V. When a maximum driver output current is reached, that output drive is reduced linearly, maintaining a constant load current. If the over-current or short circuit condition continues, each channel has an independent thermal limit circuit which will sense the rise in junction temperature and turn OFF the individual channel that is at fault. Foldback circuitry decreases the output current if excessive voltage is present across the output and assists in keeping the device within its SOA (safe operating area).

Each output also includes diagnostics for increased device protection. If any output is shorted or opened, the diagnostics can signal the controlling circuitry through a common FAULT pin. These devices can be used to drive various resistive loads including incandescent lamps (without warming or limiting resistors). With the addition of external output clamp diodes, they can be used to drive inductive loads such as relays, solenoids, or dc stepping motors.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
UDN2547B	16-pin DIP	No	view data	-20 °C to  85 °C	discontinued	samples not available
UDN2547EB	28-lead PLCC	No	view data	-20 °C to  85 °C	discontinued	samples not available
UDN2547EBTR	28-lead PLCC	No	view data	-20 °C to  85 °C	discontinued	samples not available
UDQ2547B	16-pin DIP	No	view data	-40 °C to  85 °C	discontinued	samples not available
UDQ2547EB	28-lead PLCC	No	view data	-40 °C to  85 °C	discontinued	samples not available
UDQ2547EBTR	28-lead PLCC	No	view data	-40 °C to  85 °C	discontinued	samples not available
UDK2547EB	28-lead PLCC	No	view data	-40 °C to  125 °C	discontinued	samples not available

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.