ALLEGRO 2547 DATA SHEET
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2547
PROTECTED
QUAD POWER DRIVERS
UDx2547B
FAULT
GROUND
GROUND
CONNECT.
1
OUT
2
1
OUT
3
2
4
5
6
OUT
3
NO
7
OUT
89
4
16
IN
IN
15
14
ENABLE
13
GROUND
12
GROUND
V
11
CC
10
IN
IN
Dwg. PP-018A
1
2
SUPPLY
3
4
2547
PROTECTED
QUAD POWER DRIVERS
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).
Data Sheet
29317.4C
ABSOLUTE MAXIMUM RATINGS
at T
= 25°C
A
Output Voltage, V
Over-Current Protected Output Voltage,
V
............................................... 25 V
OUT
Output Current, I
FAULT Output Voltage, V
Supply Voltage, V
Input Voltage, V
Package Power Dissipation,
........................................ See Graph
P
D
Operating Temperature Range, T
Prefix ‘UDK’ ............... -40°C to +125°C
Prefix ‘UDN’ ................. -20
Prefix ‘UDQ’................. -40
Storage Temperature Range,
T
............................... -55°C to +150°C
S
*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.
............................ 60 V
OUT
.......................... 1.3 A*
OUT
................... 40 V
F
............................ 7.0 V
CC
or VEN...................... 7.0 V
IN
A
°C to +85°C
°C to +85°C
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.
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
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 DRIVERS
10
8
R = 6°C/W
θJT
6
4
SUFFIX 'EB', R = 36°C/W
2
SUFFIX 'B', R = 43°C/W
0
25
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
θJA
θJA
50 75 100 125 150
TEMPERATURE IN °C
Dwg. GP-004-1A
GROUND
GROUND
UDx2547EB
2
OUT
4
5
6
7
8
9
10
11
12
3
OUT
NO
CONNECTION
3
NC
NC
13
NO
CONNECTION
1
OUT
2
FAULT
14
4
OUT
FAULT
1
NC
15
NO
CONNECTION
1
2
IN
28
16
IN
ENABLE
IN
26
27
GROUND
25
24
23
22
21
20
19
GROUND
V
CC
18
17
3
4
IN
SUPPLY
Dwg. PP-019
ABLE
IN
FUNCTIONAL BLOCK DIAGRAM
FAULT
COMMON CONTROL
ONE OF FOUR DRIVERS
OUT
N
THERMAL
SHUTDOWN
CURRENT
LIMIT
<<1 Ω
N
Dwg. FP-007
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
W
Copyright © 1989, 1993, Allegro MicroSystems, Inc.
2547
PROTECTED
QUAD POWER DRIVERS
ELECTRICAL CHARACTERISTICS at T
temperature range (prefix ‘UDK’ or ‘UDQ’), V
= +25°C (prefix ‘UDN’) or over operating
A
= 4.75 V to 5.5 V
CC
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Leakage Current* I
Output Sustaining Voltage V
Output Saturation Voltage V
Over-Current Limit I
OUT
OUT(SUS)
OUT(SAT)
OUT
Input Voltage Logic 1 V
Logic 0 V
Input Current Logic 1 V
Logic 0 V
Fault Output Leakage Current I
F
V
= 60 V, VIN = 0.8 V, VEN = 2.0 V — 30 150 µA
OUT
V
= 60 V, VIN = 2.0 V, VEN = 0.8 V — 30 150 µA
OUT
I
= 100 mA, V
OUT
I
= 400 mA — — 300 mV
OUT
I
= 500 mA — — 400 mV
OUT
I
= 600 mA — — 550 mV
OUT
5 ms PulseTest, V
or V
IN(1)
lN(0)
IN(1)
IN(0)
or V
or V
or V
EN(1)
EN(0)
EN(1)
EN(0)
= 0.8 V, V
IN
= 5.0 V — 1. 3 1.7 A
OUT
= Open 40 — — V
CC
2.0 — — V
— — 0.8 V
= 2.0 V — — 60 µA
= 0.8 V 10 — — µA
VF = 40 V — <1.0 2.0 µA
Fault Output Current I
Fault Output Saturation Voltage V
Total Supply Current I
Thermal Shutdown T
F
F(SAT)
CC
J
Thermal Hysteresis ∆T
Typical Data is for design information only.
*Measurement includes XOR input current
and other elements.
VF = 40 V, Driver Outputs Open,
= 0.8 V, V
V
IN
= 2.0 V 40 60 80 µA
EN
IF = 30 µA — 0.1 0.4 V
All Outputs ON — 45 50 mA
All Outputs OFF — 6.0 10 mA
— 165 — °C
J
—15— °C
TRUTH TABLE
STATUS IN
N
Normal Load H H L H
LH HH
XL HH
Over-Current or
Short to Supply H H R L
Thermal Fault H H H L
Open Load or
Short to Ground L H L L
X = Don’t care. R = Linear drive, current limited.
ENABLE OUT
N
FAULT
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