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Features
* * * * * * * * * *
2-kV ESD Protection Two Comparators with Common Reference Tight Threshold Tolerance Threshold Matched to PTC Characteristic of Incandescent Lamps Temperature Compensated NPN Output Interference and Damage-protection According to VDE 0839 EMI Protection Reversal Polarity Protection Load-dump Protection
Automotive Lamp-outage Monitor IC U479B
Description
The monolithic integrated bipolar circuit, U479B, is designed as a monitor for lamp failure in automobiles. The comparator threshold is matched to the PTC characteristic of incandescent lamps. The threshold is tied to V4,6 = VS - VT where VT = 8 mV. If the voltage drop across the shunt resistor, Rsh, exceeds 8 mV, the output is turned off, otherwise, the output is turned on. Without supply voltage or open input pin 8, the output is turned off. A comparator input, which is not used, must be connected to pin 7.
Figure 1. Schematic and Application Circuit
VS 2 Rsh Z2 + 0.6 VS + 8 + 6 1 Lamps R1 3 &
&
VBatt 7 5
OUT1
4 Rsh
OUT2
150
Rev. 4775A-AUTO-11/03
Pin Configuration
Figure 2. Pinning DIP8/SO8
1 2 3 4 8 INPUT VREF IN2 OUT1
GND VS OUT2
7 6 5
1N1
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND VS OUT2 IN1 OUT1 IN2 VREF INPUT Function Reference point, ground Supply voltage Output 2 Input 1 Output 1 Input 2 Reference voltage Input switch
2
U479B
4775A-AUTO-11/03
U479B
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Current consumption, t = 2 ms Output current Input voltage Reference point pin 7 Power dissipation Tamb = 95C Tamb = 60C Ambient temperature range Storage temperature range Junction temperature DIP8 SO8 DIP8 SO8 Pin 2, 7 1 3, 5 4, 6 Symbol VS I1 I3,5 -V4,6 Ptot Ptot Ptot Ptot Tamb Tstg Tj Value 16.5 1.5 20 6 Unit V A mA V
420 360 690 560 -40 to +95 -55 to +125 150
mW mW mW mW C C C
Thermal Resistance
Parameters Junction ambient DIP8 SO8 Symbol RthJA RthJA Value 110 160 Unit K/W K/W
3
4775A-AUTO-11/03
Electrical Characteristics
VS = 9 to 15 V, Tamb = -40 to +95C, Figure 1 on page 1, unless otherwise specified.
Parameters Supply voltage Internal Z-diode Z2 Current consumption Output saturation voltage VS = 12 V VS = 9 V, I3,5 = 10 mA Tamb = 25 C Reference point VPin 7 I3,5 = 3 mA VS = 12 V VS = 15 V VT(15 V) - VT(12 V) DV = -------------------------------------------15 V - 12 V Switch identification Input 1/input 2 Input switch Switch-on, high to low Switch-off, low to high 8 4, 6 8 3, 5 Test Conditions Pin 2, 7 2 1 3, 5 Symbol VS VZ I1 Vsat Min. 9 20 4.5 6 0.5 Typ. Max. 15 Unit V V mA V
Control signal threshold
4, 6
-VT -VT DV V8 II II td(on) td(off)
6.5 7.8
8 9.3 0.45 0.6 VS 100 5 6 30
9.5 10.8
mV mV mV/V V nA A s s
Voltage drift Threshold voltage Input currents Delay time
Figure 3. Delay Times
V4,6 12.00 11.95 V
td(off) V0 12 6 V 0 10 20 30 40 50
td(on)
60 s t
4
U479B
4775A-AUTO-11/03
U479B
Ordering Information
Extended Type Number Package Remarks
U479B U479B-FP
DIP8 SO8
- -
Package Information
Package DIP8
Dimensions in mm
9.8 9.5 1.64 1.44 7.77 7.47
4.8 max 6.4 max 0.5 min 3.3 0.58 0.48 7.62 8 5 2.54 0.36 max 9.8 8.2
technical drawings according to DIN specifications
1
4
5
4775A-AUTO-11/03
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10
5.2 4.8 3.7
0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
4
6
U479B
4775A-AUTO-11/03
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4775A-AUTO-11/03
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