8-CHANNEL SOURCE DRIVER WITH OVER-CURRENT PROTECTION Providing ov

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8-CHANNEL SOURCE DRIVER WITH OVER-CURRENT PROTECTION Providing ov

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8-CHANNEL SOURCE DRIVER
8-CHANNEL SOURCE DRIVER WITH OVER-CURRENT PROTECTION
Providing over-current protection each eight sourcing outputs, UDN2987A UDN2987LW drivers used interface between standard low-level logic relays, motors, solenoids, LEDs, incandescent lamps. device includes thermal shutdown output transient protection/clamp diodes with sustaining voltages these drivers, each channel includes latch turn that channel maximum channel current exceeded. channels disabled thermal shutdown activated. common FAULT output used indicate either chip thermal shutdown overcurrent condition. outputs enabled pulling common input high. When OE/R low, outputs inhibited eight latches reset. Under normal operating conditions, each eight outputs will source excess continuously ambient temperature 25°C supply over-current fault circuit will protect device from short-circuits ground with supply voltages
Data Sheet 29310.4A
Dwg. A-13,285
Note that UDN2987A (DIP) UDN2987LW (SOIC) electrically identical share common terminal number assignment.
inputs compatible with logic systems-TTL, Schottky TTL, DTL, PMOS, CMOS. cases, output switched active high input level. UDN2987A supplied 20-pin dual in-line plastic package; UDN2987LW supplied 20-lead small-outline plastic package.
ABSOLUTE MAXIMUM RATINGS +25°C
Driver Supply Voltage, Output Sustaining Voltage, VCE(sus) Continuous Output Current, IOUT -500 FAULT Output Voltage, FAULT Output Current, Input Voltage, Package Power Dissipation, Graph Operating Temperature Range, -20°C +85°C Storage Temperature Range, -55°C +150°C
Outputs disabled approximately -500 driver.
FEATURES
Output Source Current Over-Current Protected Internal Ground Clamp Diodes Output Breakdown Voltage Minimum TTL, DTL, PMOS, CMOS Compatible Inputs Internal Thermal Shutdown Automotive Capable
Always order complete part number: Part Number UDN2987A UDN2987LW Package 20-Pin 20-Lead Wide-Body SOIC
8-CHANNEL SOURCE DRIVER
FUNCTIONAL BLOCK DIAGRAM
ALLOWABLE PACKAGE POWER DISSIPATION WATTS
AMBIENT TEMPERATURE
Dwg. GS-004A
Dwg. A-13,286
OVER-CURRENT FAULT SENSE
OUTPUT CURRENT WAVESHAPES
Dwg. A-13,292
Dwg. A-13,293
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1987, 1997, Allegro MicroSystems, Inc.
8-CHANNEL SOURCE DRIVER
ELECTRICAL CHARACTERISTICS 25°C, (unless otherwise noted).
Characteristic Functional Supply Range Output Leakage Current Output Sustaining Voltage Output Saturation Voltage Symbol ICEX VOUT(sus) VOUT(SAT) IOUT -350 IOUT -100 IOUT -225 IOUT -350 Channel Shutdown Threshold FAULT Leakage Current FAULT Saturation Voltage Input Voltage ICEX VCE(SAT) VIN(ON) VIN(OFF) Input Current IIN(ON) IIN(OFF) Clamp Diode Leakage Current Clamp Diode Forward Voltage Supply Current IS(ON) IS(OFF) Thermal Shutdown Thermal Hysteresis Propagation Delay Time tPLH tPHL Dead Time *AII inputs simultaneously. 70°C Outputs Open Test Conditions Min. -370 Limits Typ. Max. <-5.0 -500 <1.0 1500 -200 1020 1800 Units
8-CHANNEL SOURCE DRIVER
ALLOWABLE OUTPUT CURRENT FUNCTION DUTY CYCLE
(UDN2987A shown, multiply UDN2987LW) +25°C
APPLICATIONS INFORMATION CIRCUIT DESCRIPTION
with power integrated circuits, UDN2987A UDN2987LW have maximum allowable output current rating. rating does imply that operation that value permitted even obtainable. channel output current trip point specified -370 minimum; therefore, attempted operation current levels greater than -370 cause fault indication channel shutdown. device tested maximum -350 that recommended maximum output current driver. provides protection current overloads shorted loads outputs enabled pulling OE/R input high. When OE/R allowed float (internal pull-down), outputs inhibited latches reset. Note that RESET pulse duration (OE/R low) should least This will ensure safe operation under attempted RESET conditions with shorted load. latches also reset during power regardless state OE/R input. load current causes small voltage drop across internal low-value sense resistor. This voltage compared voltage drop across reference resistor with constant current. resistors matched eliminate errors manufacturing tolerances temperature effects. Each channel includes comparator latch. over-current fault (VSENSE VREF) will affected latch shut down only that channel. other channels will continue operate normally. latch includes delay (td) prevent unwanted triggering crossover currents generated when switching inductive loads. abrupt short circuit, delay output switching times will allow brief, permissable current excess trip current before output driver turned OFF. common thermal shutdown disables outputs chip temperature exceeds +165°C. thermal shutdown, latches reset. outputs disabled until chip cools down about +150°C (thermal hysteresis). common open-collector FAULT output used indicate channel over-current condition chip thermal shutdown.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
8-CHANNEL SOURCE DRIVER
UDN2987A
Dimensions Inches
0.014 0.008
0.430 0.280 0.240
0.300
0.070 0.045
0.100 1.060 0.980
0.005
0.210
0.015
0.150 0.115 0.022 0.014
Dwg. MA-001-20
Dimensions Millimeters (Based 25.4
0.355 0.204
10.92 7.11 6.10
7.62
1.77 1.15
2.54 26.92 24.89
0.13
5.33
0.39
3.81 2.93 0.558 0.356
Dwg. MA-001-20
NOTES: Exact body lead configuration vendor's option within limits shown. Lead spacing tolerance non-cumulative. Lead thickness measured seating plane below.
8-CHANNEL SOURCE DRIVER
UDN2987LW
Dimensions Inches (Based 0.03937")
0.0125 0.0091
0.2992 0.2914
0.419 0.394
0.050 0.016 0.020 0.013
0.5118 0.4961
0.050
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-20
Dimensions Millimeters
0.32 0.23
7.60 7.40
10.65 10.00
1.27 0.40 0.51 0.33
13.00 12.60
1.27
2.65 2.35 0.10 MIN.
Dwg. MA-008-20
NOTES:
Exact body lead configuration vendor's option within limits shown. Lead spacing tolerance non-cumulative.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
8-CHANNEL SOURCE DRIVER
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8-CHANNEL SOURCE DRIVER
POWER SOURCE DRIVERS SELECTION GUIDE
ORDER OUTPUT CURRENT, OUTPUT VOLTAGE, NUMBER DRIVERS
Output Ratings
Serial Latched Drivers
Features
Diode Clamp Saturated Outputs Internal Protection Input
-120
-350
Active Pull-Down Active Pull-Down Active Pull-Down Active Pull-Down
Part Number 5815 5810-F 5811 5812-F 5818-F 6118 2585 2985 5895 2987 2981 2982 5891 2580 2983 2984 5890 2588
Current maximum specified test condition, voltage maximum rating. specification sustaining voltage limits over-current protection voltage limits. Complete part number includes additional characters indicate operating temperature range package style.
Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements design products. Components made under military approvals will accordance with approval requirements. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringements patents other rights third parties which result from use.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

8-CHANNEL SOURCE DRIVER WITH OVER-CURRENT PROTECTION Providing ov

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