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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 VCC 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 * VCC Sense: Output Turns On with Loss of VCC * Low Standby Current * Internally Fused Leads in SO-8 Package
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8 1 SO-8 DF SUFFIX CASE 751
PIN CONNECTIONS AND MARKING DIAGRAM
Output VCC Fault 1 1108 ALYW 8 GND GND GND GND
VCC VCC(SENSE) ISOURCE Drive & Bias Control Overtemp Shutdown Duty cycle during short circuit Output
Control
A WL, L YY, Y WW, W
= Assembly Location = Wafer Lot = Year = Work Week
ORDERING INFORMATION
+ -
Device
Short Circuit Detect Open Circuit Detect
Package SO-8 SO-8
Shipping 95 Units/Rail 2500 Tape & Reel
Fault
- +
CS1108EDF8 CS1108EDFR8
GND GND
GND
GND
Figure 1. Block Diagram
(c) Semiconductor Components Industries, LLC, 2001
1
April, 2001 - Rev. 6
Publication Order Number: CS1108/D
CS1108
MAXIMUM RATINGS*
Rating Storage Temperature VCC, Fault, Control ESD Capability (Human Body Model) Peak Transient Voltage (output off mode, output pin only) Lead Temperature Soldering: 1. 60 second maximum above 183C. *The maximum package power dissipation must be observed. (26 V Load Dump @ 14 V VBAT) Reflow: (SMD styles only) (Note 1) Value -65 to +150 -0.5 to 6.0 2.0 40 230 peak Unit C V kV V C
ELECTRICAL CHARACTERISTICS (4.75 VCC 5.25 V, -40C TA 85C, -40C TJ 150C; unless otherwise specified.) Characteristic Supply Requirements VCC Quiescent Current VCC Quiescent Current Output Leakage Current Saturation Voltage VOUTPUT (self-bias) Current Sense Short Circuit Current Open Circuit Current Control-Input Input Voltage Input Current Fault Output - (Open Collector) Output Low Voltage Overtemperature Shutdown TJ Output Disable Threshold TJ Hysteresis (Guaranteed by Design) (Guaranteed by Design) 150 5.0 180 - - - C C IFAULT = 250 A (sink) - 0.24 0.40 V Logic = High Logic = Low Logic = VCC Logic = 0 V 2.0 - - -50 - - 20 -20 - 0.8 40 - V V A A - Output in the ON state 350 20 500 40 650 60 mA mA VBAT = 14 V IOUTPUT = 350 mA IOUTPUT = 180 mA VCC < 4.5 V, IOUTPUT < 200 mA - - - - 16 1.1 0.9 - 100 1.5 1.3 3.5 A V V V Output ON Output OFF - - 3.0 100 6.0 250 mA A Test Conditions Min Typ Max Unit
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 1 2 3 4 5, 6, 7, 8 PIN SYMBOL Output VCC Fault Control Ground Open collector output. 5.0 V regulated supply input. Open collector diagnostic output low during open load, short circuit and overtemperature conditions. TTL compatible input. Signal ground. FUNCTION
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CS1108
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 180C (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.
Output 10 nF VCC Fault 20 k Control VBAT VCC
GND
CS1108
GND GND GND
microprocessor
Figure 2. Applications Diagram
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CS1108
PACKAGE DIMENSIONS
SO-8 DF SUFFIX CASE 751-07 ISSUE V
A
8 5
-X-
B
1 4
S
0.25 (0.010)
M
Y
M
-Y- G C -Z- H D 0.25 (0.010)
M SEATING PLANE
K
MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0_ 8_ 0.010 0.020 0.228 0.244
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
DIM A B C D G H J K M N S
PACKAGE THERMAL DATA Parameter RJC RJA Typical Typical SO-8 25 110 Unit C/W C/W
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
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CS1108/D

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