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Part: A2547
Category:
Description: Protected Quad Power Driver
Company: Allegro Micro Systems, Inc.
Datasheet: Download A2547 datasheet File size : 192 kB
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Datasheet text preview:
2547
UDx2547B (DIP)
FAULT OUT1 OUT2 GROUND GROUND OUT3 NO CONNECT. OUT4 1 2 3 4 5 6 7 8 V CC 16 15 14 13 12 11 10 9 IN 1 IN2 ENABLE GROUND GROUND SUPPLY IN 3 IN 4
PROTECTED QUAD POWER DRIVER
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. The suffix `B' devices are 16-pin power DIPs while the suffix `EB' devices are 28-lead power PLCCs for surface-mount applications. Both packages are of batwing construction to provide for maximum package power dissipation.
Data Sheet 29317.4C*
Dwg. PP-018A
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
Output Voltage, VOUT .... 60 V Over-Current Protected Output Voltage, VOUT ..... 25 V Output Current, IOUT .. 1.3 A* FAULT Output Voltage, VF .......... 40 V Supply Voltage, VCC .... 7.0 V Input Voltage, VIN or VEN .... 7.0 V Package Power Dissipation, PD ....... See Graph Operating Temperature Range, TA Prefix `UDK' ...... -40°C to +125°C Prefix `UDN' ........ -20°C to +85°C Prefix `UDQ' ........ -40°C to +85°C Storage Temperature Range, TS ....... -55°C to +150°C
*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 .
2547 PROTECTED QUAD POWER DRIVER
UDx2547EB (PLCC)
10
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
OUT2 NO CONNECTION
FAULT
IN 1
R
JT
= 6°C/W
GROUND 5
NC 25 FAULT 6 7 24 23 22 21 20 19 NC NC VCC GROUND GROUND
6
4
SUFFIX 'EB', R
JA
8
= 36°C/W
9 10 GROUND 11
2
SUFFIX 'B', R JA = 43°C/W
15
12
13
14
16
25
50
NO CONNECTION
NO CONNECTION
OUT 4
OUT 3
IN 4
IN 3
Dwg. GP-004-1A
SUPPLY
75 100 TEMPERATURE IN °C
125
150
17
18
0
28
27
26
3
1
8
4
2
IN 2
ENABLE
OUT1
Dwg. PP-019
FUNCTIONAL BLOCK DIAGRAM
FAULT ABLE
COMMON CONTROL ONE OF FOUR DRIVERS
IN N THERMAL SHUTDOWN CURRENT LIMIT
OUTN
<<1
Dwg. FP-007
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1989, 2002 Allegro MicroSystems, Inc.
2547 PROTECTED QUAD POWER DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C (prefix `UDN') or over operating temperature range (prefix `UDK' or `UDQ'), VCC = 4.75 V to 5.5 V
Characteristic Output Leakage Current* Symbol I OUT Test Conditions VOUT = 60 V, VIN = 0.8 V, VEN = 2.0 V VOUT = 60 V, VIN = 2.0 V, VEN = 0.8 V Output Sustaining Voltage Output Saturation Voltage V OUT(SUS) V OUT(SAT) IOUT = 100 mA, VIN = 0.8 V, VCC = Open IOUT = 400 mA IOUT = 500 mA IOUT = 600 mA Over-Current Limit Input Voltage I OUT Logic 1 Logic 0 Input Current Logic 1 Logic 0 Fault Output Leakage Current Fault Output Current IF IF 5 ms PulseTest, VOUT = 5.0 V VIN(1) or VEN(1) VlN(0) or VEN(0) VIN(1) or VEN(1) = 2.0 V VIN(0) or VEN(0) = 0.8 V VF = 40 V VF = 40 V, Driver Outputs Open, VIN = 0.8 V, VEN = 2.0 V Fault Output Saturation Voltage Total Supply Current V F(SAT) I CC IF = 30 µA All Outputs ON All Outputs OFF Thermal Shutdown Thermal Hysteresis TJ TJ 40 -- -- -- -- -- 60 0.1 45 6.0 165 15 80 0.4 50 10 -- -- µA V mA mA °C °C Min. -- -- 40 -- -- -- -- 2.0 -- -- 10 -- Limits Typ. Max. 30 30 -- -- -- -- 1. 3 -- -- -- -- <1.0 150 150 -- 300 400 550 1.7 -- 0.8 60 -- 2.0 Units µA µA V mV mV mV A V V µA µA µA
Typical Data is for design information only. *Measurement includes XOR input current and other elements.
TRUTH TABLE
STATUS Normal Load INN H L X H H L ENABLE H H L H H H OUTN L H H R H L FAULT H H H L L L
Over-Current or Short to Supply Thermal Fault Open Load or Short to Ground
X = Don't care.
R = Linear drive, current limited.
2547 PROTECTED QUAD POWER DRIVER
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 CIRCUIT 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
TIME
Dwg. WP-005A
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2547 PROTECTED QUAD POWER DRIVER
UDN2547B and UDQ2547B
Dimensions in Inches (controlling dimensions)
16 9 0.020 0.008
NOTE 4
0.430 0.280 0.240
MAX
0.300
BSC
1 0.070 0.045
0.100 0.775 0.735
BSC
8 0.005
MIN
0.210
MAX
0.015
MIN
0.150 0.115 0.022 0.014
Dwg. MA-001-17A in
Dimensions in Millimeters (for reference only)
16
NOTE 4
9
0.508 0.204
10.92 7.11 6.10
MAX
7.62
BSC
1 1.77 1.15
2.54 19.68 18.67
BSC
8 0.13
MIN
5.33
MAX
0.39
MIN
3.81 2.93 0.558 0.356
Dwg. MA-001-17A mm
NOTES: 1. 2. 3. 4.
Exact body and lead configuration at vendor's option within limits shown. Lead spacing tolerance is non-cumulative Lead thickness is measured at seating plane or below. Webbed lead frame. Leads 4, 5, 12, and 13 are internally one piece.
Others parts begin by a2
A2-1 A2-2 A2-3 A2-4
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