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PROTECTED QUAD POWER DRIVERS

Data Sheet 29317.4C

PROTECTED QUAD POWER DRIVERS
Data Sheet 29317.4C
UDx2547B
FAULT
16 IN1 15 IN2 14 ENABLE 13 GROUND 12 GROUND Vcc 11 SUPPLY 10 IN3 9 IN4
OUT1 2 OUT2 3 GROUND 4 GROUND 5 OUT3 6 NO CONNECTION OUT4 7 8
Dwg. PP-018
Outputs are current limited at approximately 1.3 A per driver and junction temperature limited if current in excess of 1.3 A is attempted. See Circuit Description and Application for further information.
FEATURES
s s s s s Output SOA Protection s Low Output-Saturation Voltage Diagnostic FAULT Output s 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
Always order by complete part number: a prefix to indicate operating temperature range + the basic four-digit part number + a suffix to indicate package style, e.g., UDK2547EB .
PROTECTED QUAD POWER DRIVERS
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
UDx2547EB
NO CONNECTION
FAULT
GROUND 5
NC 25 FAULT 24 23 22 21 20 19 NC
Dwg. GP-004-1A
ENABLE
GROUND
10 GROUND 11 NC VCC
0 25 50 75 100 TEMPERATURE IN °C 125 150
GROUND
NO CONNECTION
SUPPLY
Dwg. PP-019
FUNCTIONAL BLOCK DIAGRAM
FAULT ABLE
COMMON CONTROL ONE OF FOUR DRIVERS
IN N THERMAL SHUTDOWN CURRENT LIMIT
Dwg. FP-007
PROTECTED QUAD POWER DRIVERS
Typical Data is for design information only. Measurement includes XOR input current and other elements.
TRUTH TABLE
Over-Current or Short to Supply Thermal Fault Open Load or Short to Ground
PROTECTED QUAD POWER DRIVERS
CIRCUIT DESCRIPTION AND APPLICATION
NORMAL LAMP IN-RUSH CURRENT
NOT TO SCALE
LAMP CURRENT
These devices monitor their outputs for open or shorted conditions. Both conditions are sensed by comparing the input and output states. Note that the FAULT output is operational only if the ENABLE input is high. When a fault condition is sensed, the FAULT output will go to a low state. An external FAULT output filter capacitor (0.1µF) is recommended to eliminate erroneous switching. INCANDESCENT LAMP DRIVER
SHORT CIRQUIT CURRENT LIMIT
High incandescent lamp turn-ON / in-rush currents can contribute to poor lamp reliability and destroy semiconductor lamp drivers. Warming (parallel) or current-limiting (series) resistors protect both driver and lamp but use significant power either when the lamp is OFF or when the lamp is ON, respectively. Lamps with steady-state current ratings up to 600 mA can be driven without the need for warming or current-limiting resistors, if lamp turn-ON time is not a concern. When an incandescent lamp is initially turned ON, the cold filament is at minimum resistance and would normally allow a 10x to 12x in-rush current. With these drivers, during turn-ON, the high in-rush current is sensed by the internal low-value sense resistor, drive current to the output stage is diverted by the shunting transistor, the output stage operates in a linear mode, and the load current is limited to approximately 1.3 A. During lamp warmup, the filament resistance increases to its maximum value, the output driver goes into saturation and applies maximum rated voltage to the lamp. INDUCTIVE LOAD DRIVER With the addition of external clamp diodes, bifilar (unipolar) stepper motors and other inductive loads can be driven directly. The external diodes prevent damage to the output transistors by suppressing the high-voltage spikes that occur when turning OFF an inductive load. For rapid current decay (fast turn-OFF speeds), the use of Zener diodes will raise the flyback voltage and improve performance. However, the peak voltage must not exceed the specified minimum sustaining voltage (VSUPPLY + VZ + VF VOUT(SUS)). OVER-CURRENT CONDITIONS In the event of a shorted load, or stalled motor, the load current will attempt to increase. As described above, the drive current to the affected output stage is linearly reduced (limiting the load current to about 1.3 A), causing the output stage to go linear. As the junction temperature of the output stage increases, the thermal shutdown circuit will shut OFF the affected output. If the fault condition is corrected, the output driver will return to its normal saturated condition.
THERMAL SHUTDOWN THERMAL HYSTERESIS
Dwg. WP-005A
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
PROTECTED QUAD POWER DRIVERS
UDN2547B and UDQ2547B Dimensions in Inches
NOTE 4
Dwg. MA-001-17A in
NOTE 4
Dwg. MA-001-17A mm
NOTES: 1. 2. 3. 4.
PROTECTED QUAD POWER DRIVERS
UDN2547EB and UDQ2547EB Dimensions in Inches
INDEX AREA
Dwg. MA-005-28A in
INDEX AREA
Dwg. MA-005-28A mm
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
PROTECTED QUAD POWER DRIVERS
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PROTECTED QUAD POWER DRIVERS
POWER SINK DRIVERS SELECTION GUIDE
IN ORDER OF 1) OUTPUT CURRENT, 2) OUTPUT VOLTAGE, 3) NUMBER OF DRIVERS
Output Ratings
Serial Latched
Features
Diode Saturated Internal Protection - - - - X - - - - - - - - X X X - X X - - X - - X - - - - - Input Drivers Clamp Outputs - - - X X X - - X X - X - - X - Hall Sensor / Driver X - - - X X Hall Sensor / Driver - X - X X - - X X - X X - - X X X - X X X - Dual 4 to 14-Line Decoder / Driver - - - - X - - X X - - X X - - X X Hall Sensor / Driver X X Hall Sensor / Driver X X Stepper Motor Controller / Driver MOS Microstepping Controller / Driver MOS Stepper Motor Translator / Driver - - - X - - - X - X X - - - - X - - - X - Stepper Motor Controller / Driver MOS - - X - - - X -
Part Number
2595 5833 5832 7003 5140 2596 5275 5800 5801 5821 5841 5842 6817 2547 2549 2543 and 2559 2597 3625 3626 7024 and 7029 7042 5804 2064 and 2068 2065 and 2069 5829 2544 2540 7026 2878 2879
Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or over-current protection voltage limits. Complete part number includes additional characters to indicate operating temperature range and package style.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. Components made under military approvals will be in accordance with the approval requirements. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000