udn2987.pdf

2987

8-CHANNEL

SOURCE DRIVER

2987

8-CHANNEL SOURCE DRIVER

WITH OVER-CURRENT PROTECTION

OUT

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.

IN 2

OUT 2

IN 3

OUT 3

IN 4

OUT 4

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.

IN 5

OUT 5

IN 6

OUT 6

IN 7

OUT 7

IN 8

OUT 8

Under normal operating conditions, each of eight outputs will

source in excess of 100 mA continuously at an ambient temperature of

GROUND

FAULT

OE N

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.

OE/R

SENSE N

V S

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 T A = +25

FEATURES

Driver Supply Voltage, V S ..................... 35 V

Output Sustaining Voltage, V CE(sus) ...... 35 V

Continuous Output Current,

I OUT ........................................ -500 mA*

FAULT Output Voltage, V CE ................. 35 V

FAULT Output Current, l C ................. 30 mA

Input Voltage, V IN ................................. 15 V

Package Power Dissipation,

P D ........................................ See Graph

Operating Temperature Range,

T A ................................. -20

350 mA Output Source Current

Over-Current Protected

Internal Ground Clamp Diodes

Output Breakdown Voltage 35 V, Minimum

TTL, DTL, PMOS, or CMOS Compatible Inputs

Internal Thermal Shutdown

Automotive Capable

C to +85

Always order by complete part number:

Storage Temperature Range,

T S ............................... -55

Part Number

Package

C to +150

UDN2987A

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

100

125

150

AMBIENT TEMPERATURE IN ° C

Dwg. GS-004A

Dwg. No. A-13,286

OVER-CURRENT FAULT SENSE

OUTPUT CURRENT WAVESHAPES

PHL

Dwg. No. A-13,292

Dwg. No. A-13,293

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

2987

8-CHANNEL

SOURCE DRIVER

ELECTRICAL CHARACTERISTICS at T A = 25

C, V OE = 2.4 V, V S = 35 V

(unless otherwise noted).

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Functional Supply Range

V S

7.0

—

Output Leakage Current

I CEX

V IN = 0.4 V*

—

<-5.0

-200

Output Sustaining Voltage

V OUT(sus)

I OUT = -350 mA, L = 2.0 mH

—

Output Saturation Voltage

V OUT(SAT)

V IN = 2.4 V, I OUT = -100 mA

—

1.6

1.8

V IN = 2.4 V, I OUT = -225 mA

—

1.7

1.9

V IN = 2.4 V, I OUT = -350 mA

—

1.8

2.0

Channel Shutdown Threshold

I M

V IN = 2.4 V

-370

-500

—

FAULT Leakage Current

I CEX

V CC = 35 V

—

<1.0

100

FAULT Saturation Voltage

V CE(SAT)

I C = 30 mA

—

0.3

0.8

Input Voltage

V IN(ON)

2.4

—

V IN(OFF)

—

0.4

Input Current

I IN(ON)

V IN = 2.4 V

—

125

170

V IN = 5.0 V

—

840

1020

V IN = 12 V

—

1500

1800

I IN(OFF)

V IN = 0.4 V

—

Clamp Diode Leakage Current

I R

V R = 35 V, T A = 70

—

Clamp Diode Forward Voltage

V F

I F = 350 mA

—

1.5

1.8

Supply Current

I S(ON)

V IN = 2.4 V*, Outputs Open

—

I S(OFF)

V IN = 0.4 V*

—

8.0

Thermal Shutdown

T J

—

165

—

Thermal Hysteresis

T J

—15

—

Propagation Delay Time

t PLH

R L = 100

—

0.3

0.6

t PHL

R L = 100

—

2.0

4.0

Dead Time

t d

—

1.0

—

*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

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

At +50

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

and its own latch. An over-current fault (V SENSE > V REF )

will set the affected latch and shut down only that channel.

All other channels will continue to operate normally. The

latch includes a 1

s delay (t d ) 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.

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

s. 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.

A common thermal shutdown disables all outputs

if the chip temperature exceeds +165

2987

8-CHANNEL

SOURCE DRIVER

UDN2987A

Dimensions in Inches

(controlling dimensions)

0.014

0.008

0.280

0.240

0.430

MAX

0.300

BSC

0.070

0.045

0.100

BSC

0.005

MIN

1.060

0.980

0.210

MAX

0.015

MIN

0.150

0.115

0.022

0.014

Dwg. MA-001-20 in

Dimensions in Millimeters

(for reference only)

0.355

0.204

7.11

6.10

10.92

MAX

7.62

BSC

1.77

1.15

2.54

BSC

0.13

MIN

26.92

24.89

5.33

MAX

0.39

MIN

3.81

2.93

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.

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