A2987 [ALLEGRO]
8-CHANNEL SOURCE DRIVER WITH OVER-CURRENT PROTECTION; 8声道音源驱动器具有过电流保护
| 型号： | A2987 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | 8-CHANNEL SOURCE DRIVER WITH OVER-CURRENT PROTECTION |
| 文件： | 总8页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2987
8-CHANNEL SOURCE DRIVER
WITH OVER-CURRENT PROTECTION
Providing over-current protection for each of its eight sourcing
outputs, the UDN2987A and UDN2987LW drivers are used as an
interface between standard low-level logic and relays, motors, sole-
noids, LEDs, and incandescent lamps. The device includes thermal
shutdown and output transient protection/clamp diodes for use with
sustaining voltages to 35 V.
20
1
2
3
4
OUT
IN
IN
IN
IN
IN
1
1
19
18
17
OUT
OUT
OUT
2
2
3
4
3
4
5
6
7
8
In these drivers, each channel includes a latch to turn OFF that
channel if the maximum channel current is exceeded. All channels are
disabled if the thermal shutdown is activated. A common FAULT
output is used to indicate either chip thermal shutdown or any over-
current condition. All outputs are enabled by pulling the common OE/
R input high. When OE/R is low, all outputs are inhibited and the eight
latches are reset.
5
6
16
15
OUT
OUT
5
6
IN
IN
IN
7
8
14
13
12
OUT
OUT
7
8
Under normal operating conditions, each of eight outputs will
source in excess of 100 mA continuously at an ambient temperature of
25°C and a supply of 35 V. The over-current fault circuit will protect
the device from short-circuits to ground with supply voltages of up to
35 V.
x8
GROUND
9
FAULT
OE/R
OEN
OE
FF
SENSEN
10
V
S
11
Dwg. PP-067
The inputs are compatible with 5 V and 12 V logic systems—TTL,
Schottky TTL, DTL, PMOS, and CMOS. In all cases, the output is
switched ON by an active high input level. The UDN2987A is supplied
in a 20-pin dual in-line plastic package; the UDN2987LW is supplied in
a 20-lead small-outline plastic package.
Note that the UDN2987A (DIP) and the UDN2987LW
(SOIC) are electrically identical and share a common
terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
FEATURES
Driver Supply Voltage, VS ..................... 35 V
Output Sustaining Voltage, VCE(sus) ...... 35 V
■ 350 mA Output Source Current
■ Over-Current Protected
Continuous Output Current,
IOUT ........................................ -500 mA*
■ Internal Ground Clamp Diodes
■ Output Breakdown Voltage 35 V, Minimum
■ TTL, DTL, PMOS, or CMOS Compatible Inputs
■ Internal Thermal Shutdown
FAULT Output Voltage, VCE ................. 35 V
FAULT Output Current, lC ................. 30 mA
Input Voltage, VIN ................................. 15 V
Package Power Dissipation,
■ Automotive Capable
PD ........................................ See Graph
Operating Temperature Range,
Always order by complete part number:
TA ................................. -20°C to +85°C
Storage Temperature Range,
Part Number
UDN2987A
Package
TS ............................... -55°C to +150°C
20-Pin DIP
* Outputs are disabled at approximately -500 mA
per driver.
UDN2987LW
20-Lead Wide-Body SOIC
2987
8-CHANNEL
SOURCE DRIVER
FUNCTIONAL BLOCK DIAGRAM
2.5
2.0
1.5
1.0
0.5
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN °C
Dwg. GS-004A
Dwg. No. A-13,286
OUTPUT CURRENT WAVESHAPES
OVER-CURRENT FAULT SENSE
PHL
Dwg. No. A-13,293
Dwg. No. A-13,292
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1987, 1997, Allegro MicroSystems, Inc.
2987
8-CHANNEL
SOURCE DRIVER
ELECTRICAL CHARACTERISTICS at TA = 25°C, VOE = 2.4 V, VS = 35 V
(unless otherwise noted).
Limits
Max.
Characteristic
Symbol
VS
Test Conditions
Min.
7.0
—
Typ.
—
Units
V
Functional Supply Range
Output Leakage Current
Output Sustaining Voltage
Output Saturation Voltage
35
-200
—
ICEX
VIN = 0.4 V*
<-5.0
—
µA
V
VOUT(sus)
VOUT(SAT)
IOUT = -350 mA, L = 2.0 mH
VIN = 2.4 V, IOUT = -100 mA
VIN = 2.4 V, IOUT = -225 mA
VIN = 2.4 V, IOUT = -350 mA
VIN = 2.4 V
35
—
1.6
1.7
1.8
-500
<1.0
0.3
—
1.8
1.9
2.0
—
V
—
V
—
V
Channel Shutdown Threshold
FAULT Leakage Current
FAULT Saturation Voltage
Input Voltage
IM
-370
—
mA
µA
V
ICEX
VCC = 35 V
100
0.8
—
VCE(SAT)
VIN(ON)
VIN(OFF)
IIN(ON)
IC = 30 mA
—
2.4
—
V
—
0.4
170
1020
1800
15
V
Input Current
VIN = 2.4 V
—
125
840
1500
—
µA
µA
µA
µA
µA
V
VIN = 5.0 V
—
VIN = 12 V
—
IIN(OFF)
IR
VIN = 0.4 V
—
Clamp Diode Leakage Current
Clamp Diode Forward Voltage
Supply Current
VR = 35 V, TA = 70°C
IF = 350 mA
—
—
50
VF
—
1.5
13
1.8
18
IS(ON)
IS(OFF)
TJ
VIN = 2.4 V*, Outputs Open
VIN = 0.4 V*
—
mA
mA
°C
°C
µs
µs
µs
—
8.0
165
15
12
Thermal Shutdown
—
—
Thermal Hysteresis
Propagation Delay Time
∆TJ
tPLH
tPHL
td
—
—
RL = 100Ω
RL = 100Ω
—
0.3
2.0
1.0
0.6
4.0
—
—
Dead Time
—
*AII inputs simultaneously.
2987
8-CHANNEL
SOURCE DRIVER
ALLOWABLE OUTPUT CURRENT
AS A FUNCTION OF DUTY CYCLE
(UDN2987A shown, multiply by 78% for UDN2987LW)
APPLICATIONS INFORMATION
AND CIRCUIT DESCRIPTION
As with all power integrated circuits, the UDN2987A
and UDN2987LW have a maximum allowable output
current rating. The 500 mA rating does not imply that
operation at that value is permitted or even obtainable.
The channel output current trip point is specified as -370
mA, minimum; therefore, attempted operation at current
levels greater than -370 mA may cause a fault indication
and channel shutdown. The device is tested at a maxi-
mum of -350 mA and that is the recommended maximum
output current per driver. It provides protection for current
overloads or shorted loads up to 35 V.
At +25°C
All outputs are enabled by pulling the OE/R input high.
When OE/R is low or allowed to float (internal pull-down),
all outputs are inhibited and the latches are reset. Note
that the RESET pulse duration (OE/R low) should be
at least 1 µs. This will ensure safe operation under
attempted RESET conditions with a shorted load. The
latches are also reset during power up, regardless of the
state of the OE/R input.
The load current causes a small voltage drop across
the internal low-value sense resistor. This voltage is
compared to the voltage drop across a reference resistor
with a constant current. The two resistors are matched to
eliminate errors due to manufacturing tolerances or
temperature effects. Each channel includes a comparator
At +50°C
and its own latch. An over-current fault (VSENSE > VREF
)
will set the affected latch and shut down only that channel.
All other channels will continue to operate normally. The
latch includes a 1 µs delay (td) to prevent unwanted
triggering due to crossover currents generated when
switching inductive loads. For an abrupt short circuit, the
delay and output switching times will allow a brief,
permissable current in excess of the trip current before the
output driver is turned OFF.
A common thermal shutdown disables all outputs
if the chip temperature exceeds +165°C. At thermal
shutdown, all latches are reset. The outputs are disabled
until the chip cools down to about +150°C (thermal
hysteresis).
A common open-collector FAULT output is used to
indicate any channel over-current condition or chip
thermal shutdown.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2987
8-CHANNEL
SOURCE DRIVER
UDN2987A
Dimensions in Inches
(controlling dimensions)
0.014
0.008
20
11
0.430
MAX
0.280
0.240
0.300
BSC
1
10
0.100
0.070
0.045
0.005
BSC
MIN
1.060
0.980
0.210
MAX
0.015
0.150
0.115
MIN
0.022
0.014
Dwg. MA-001-20 in
Dimensions in Millimeters
(for reference only)
0.355
0.204
20
11
10.92
MAX
7.11
6.10
7.62
BSC
1
10
2.54
1.77
1.15
0.13
BSC
MIN
26.92
24.89
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
Dwg. MA-001-20 mm
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Lead thickness is measured at seating plane or below.
2987
8-CHANNEL
SOURCE DRIVER
UDN2987LW
Dimensions in Inches
(for reference only)
20
11
0.0125
0.0091
0.419
0.394
0.2992
0.2914
0.050
0.016
0.020
0.013
1
2
0.050
3
BSC
0° TO 8°
0.5118
0.4961
0.0926
0.1043
Dwg. MA-008-20 in
0.0040 MIN.
Dimensions in Millimeters
(controlling dimensions)
20
11
0.32
0.23
10.65
10.00
7.60
7.40
1.27
0.40
0.51
0.33
1
2
1.27
3
BSC
0° TO 8°
13.00
12.60
2.65
2.35
Dwg. MA-008-20 mm
0.10 MIN.
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2987
8-CHANNEL
SOURCE DRIVER
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2987
8-CHANNEL
SOURCE DRIVER
POWER SOURCE DRIVERS
SELECTION GUIDE
IN ORDER OF 1) OUTPUT CURRENT, 2) OUTPUT VOLTAGE, 3) NUMBER OF DRIVERS
Features
Output Ratings *
Serial
Input
Latched
Drivers
Diode
Clamp
Saturated
Outputs
Internal
mA
V
60
60
60
60
60
85
-25
30
50
35
50
50
-50
80
80
-80
#
Protection
Part Number†
5815
-25
8
–
X
X
X
X
–
–
–
X
–
–
X
–
–
X
–
X
X
X
X
X
–
–
–
X
–
–
X
–
–
X
–
–
–
–
–
–
–
–
–
–
–
–
X
–
–
–
–
–
–
10
12
20
32
8
Active Pull-Down
–
–
–
–
–
X
X
X
–
–
–
–
–
–
–
5810-F and 6809/10
5811 and 6811
5812-F and 6812
5818-F and 6818
6118
Active Pull-Down
Active Pull-Down
Active Pull-Down
–
X
X
X
X
X
X
X
X
X
X
-120
-350
8
2585
8
2985
8
5895
8
2987
8
2981 and 2982
5891
8
8
2580
8
2983 and 2984
5890
8
8
2588
*
†
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.
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
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