CS1108EDFR8 Datasheet CS1108EDFR8 | P1-P3

 Semiconductor Components Industries, LLC, 2001

April, 2001 – Rev. 6

1 Publication Order Number:

CS1108/D

CS1108

Single Lamp Driver IC

This ASIC provides up to 350 mA of drive current for powering

bulbs. The typical application for this part is for use in airbag systems

using a type 194 bulb. On–chip diagnostics provide open circuit and

short circuit detection in the output on mode. In addition, the output

driver will turn on (sink current) when V

is low. Fault is an

active–low output which reports in the output–on mode. Internal

pull–up circuitry is provided to ensure the output pin turns on when the

Control pin is floating.

Features

• Fault Detection

– Open Circuit

– Short Circuit

– Overtemperature

• V

Sense: Output Turns On with Loss of V

• Low Standby Current

• Internally Fused Leads in SO–8 Package

GND

Control

Output

Short Circuit

Detect

Figure 1. Block Diagram

Drive &

Bias

Open Circuit

Detect

Duty cycle

during short

circuit

Overtemp

Shutdown

SOURCE

GND GND

GND

Fault

CC(SENSE)

–

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Device Package Shipping

ORDERING INFORMATION

CS1108EDF8

SO–8

95 Units/Rail

CS1108EDFR8

SO–8

2500 Tape & Reel

A = Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

SO–8

DF SUFFIX

CASE 751

GNDControl

1108

ALYW

GNDFault

GNDV

GNDOutput

PIN CONNECTIONS AND

MARKING DIAGRAM

CS1108

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MAXIMUM RATINGS*

Rating Value Unit

Storage Temperature –65 to +150 °C

, Fault, Control –0.5 to 6.0 V

ESD Capability (Human Body Model) 2.0 kV

Peak Transient Voltage (output off mode, output pin only) (26 V Load Dump @ 14 V V

BAT

) 40 V

Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) 230 peak °C

1. 60 second maximum above 183°C.

*The maximum package power dissipation must be observed.

ELECTRICAL CHARACTERISTICS (4.75 ≤ V

≤ 5.25 V, –40°C ≤ T

≤ 85°C, –40°C ≤ T

≤ 150°C; unless other-

wise specified.)

Characteristic Test Conditions Min Typ Max Unit

Supply Requirements

Quiescent Current Output ON – 3.0 6.0 mA

Quiescent Current Output OFF – 100 250 µA

Output

Leakage Current

BAT

= 14 V – 16 100 µA

Saturation Voltage I

OUTPUT

= 350 mA

OUTPUT

= 180 mA

–

1.1

0.9

1.5

1.3

OUTPUT

(self–bias) V

< 4.5 V, I

OUTPUT

< 200 mA – – 3.5 V

Current Sense

Short Circuit Current – 350 500 650 mA

Open Circuit Current Output in the ON state 20 40 60 mA

Control–Input

Input Voltage Logic = High

Logic = Low

2.0

–

0.8

Input Current Logic = V

Logic = 0 V

–

–50

–20

–

µA

Fault Output – (Open Collector)

Output Low Voltage

FAULT

= 250 µA (sink) – 0.24 0.40 V

Overtemperature Shutdown

Output Disable Threshold (Guaranteed by Design) 150 180 – °C

Hysteresis (Guaranteed by Design) 5.0 – – °C

Note: A fault signal will be shown (at the fault pin) during inrush as the short circuit threshold is exceeded.

PACKAGE PIN DESCRIPTION

PACKAGE PIN #

8 Lead SO Narrow

PIN SYMBOL FUNCTION

1 Output Open collector output.

2 V

5.0 V regulated supply input.

3 Fault Open collector diagnostic output low during open load, short

circuit and overtemperature conditions.

4 Control TTL compatible input.

5, 6, 7, 8 Ground Signal ground.

CS1108

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CIRCUIT DESCRIPTION

The CS1108 lamp driver IC provides up to 350 mA of

drive current in a low–side configuration. The Output driver

pin is controlled through the TTL compatible Control input

pin. A high condition on the Control pin turns the output pin

on.

The Fault

pin reports short circuit, open circuit, and

overtemperature conditions on the IC. If a fault is present,

the open collector output Fault pin will be low. Typical

numbers for faults are: exceeding 500 mA of drive current

will report a short circuit. Less than 40 mA (typical) will

report an open circuit. A temperature fault will be reported

when the die temperature exceeds 180°C (typical). Faults

are only reported when the Control pin is high, due to the low

quiescent current when the Control pin is low and the output

device is turned off.

The CS1108 is designed to provide overcurrent protection

by duty cycle control. When the lamp current exceeds the

internally programmed current limit threshold (typically

500 mA), the output enters duty cycle mode to reduce power

dissipation of the IC to a safe level.

Typical lamps have a low resistance when off and the

current will exceed the current limit threshold during the

initial inrush period. During this inrush time, the IC will be

operating in the duty cycle mode. Due to characteristics of

lamps in this mode, they may appear dimly lit. This

condition will persist for a breif time until the lamp

resistance has increased enough to reduce it’s current below

the threshold. Once this occurs the lamp will appear at full

brightness. During the inrush period the Fault pin will be

forced low indicating that duty cycle mode is in operation.

Thermal protection has been designed into this IC. Should

duty cycle mode operate for an extended amount of time and

the power limitations of the IC are exceeded the IC die

temperature will rise. Once the die temperature reaches the

thermal temperature limit, the internal cicuitry will shutoff

the output and the lamp will turn off. Once the die temperature

lowers below the thermal threshold, the output will be

allowed to turn back on.

Figure 2. Applications Diagram

10 nF

20 k

BAT

Output

Fault

Control

GND

CS1108

microprocessor

P1-P3 P4-P4

CS1108EDFR8

Mfr. #:

Buy CS1108EDFR8

Manufacturer:

ON Semiconductor

Description:

IC DRIVER LAMP SGL 350MA 8SOIC

Lifecycle:

New from this manufacturer.

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CS1108EDFR8