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U4790B Dataheets PDF



Part Number U4790B
Manufacturers TEMIC
Logo TEMIC
Description Automotive Lamp-Outage Monitor
Datasheet U4790B DatasheetU4790B Datasheet (PDF)

www.DataSheet4U.com U4790B Automotive Lamp-Outage Monitor, VT = 8 mV, VZ(3,5) = 22 V Description The bipolar IC U4790B 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 a typical value of V4,6 = VS – VT where VT = 8 mV. If the voltage drop across shunt resistor, Rsh, exceeds 8 mV, the output is turned off, otherwise the output is turned on. Without supply voltage or open input P.

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www.DataSheet4U.com U4790B Automotive Lamp-Outage Monitor, VT = 8 mV, VZ(3,5) = 22 V Description The bipolar IC U4790B 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 a typical value of V4,6 = VS – VT where VT = 8 mV. If the voltage drop across 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. An unused comparator input must be connected to Pin 7. Features D 10 kV–ESD protection D Two comparators with common reference D Tight threshold tolerance D Threshold matched to PTC characteristic of incandescent lamps D Temperature compensated D NPN output D Interference and damage–protection according to VDE 0839 D EMI protection D Reversal polarity protection D Load-dump protection Ordering Information Extended Type Number U4790B Package DIP8 Remarks Block Diagram VS 2 Rsh Z2 – + & Z5 0.6 VS – + 8 – + 6 Z3 1 95 10606 VBatt 7 5 OUT1 4 Rsh 3 OUT2 & Lamps R1 150 W Figure 1. Schematic and application circuit TELEFUNKEN Semiconductors Rev. A2, 03-Dec-97 1 (5) DataSheet 4 U .com www.DataSheet4U.com U4790B Pin Description Input switch VRef IN2 OUT1 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 GND VS OUT2 IN1 1 2 3 4 95 10634 8 7 6 5 Figure 2. Pinning Absolute Maximum Ratings Parameters Supply voltage Current consumption t = 2 ms, measured at Pin 1 (GND) Output current Input voltage reference point Pin 7 Power dissipation DIP 8 Tamb = 95 °C Tamb = 60 °C DIP 8 Ambient temperature range Storage temperature range Junction temperature Pin 2, 7 Pin 1 Pin 3, 5 Pin 4, 6 Symbol VS I1 I3,5 –V4,6 Ptot Ptot Tamb Tstg Tj Value 16.5 1.5 20 6 420 690 –40 to +95 –55 to +125 150 Unit V A mA V mW mW °C °C °C Thermal Resistance Parameters Junction ambient DIP8 Symbol RthJA Value 110 Unit K/W 2 (5) TELEFUNKEN Semiconductors Rev. A2, 03-Dec-97 DataSheet 4 U .com www.DataSheet4U.com U4790B Electrical Characteristics VS = 9 to 15 V, Tamb = –40 to +95 °C, figure 1, unless otherwise specified Parameters Supply voltage Internal Z diode Z2 Current consumption Test Conditions / Pin Pin 2,7 Pin 2 VS = 12 V Pin 1 measured at Pin 1 (GND) Output saturation voltage VS = 9 V, I3,5 = 10 mA Pin 3,5 Tamb = 25 °C Output Z diodes Z3, Z5 Pin 3,5 Control signal threshold Reference point Pin 7 (V7) Pin 4,6 I3,5 = 3 mA VS = 12 V VS = 15 V * VT(12V) V Voltage drift Pin 4,6 D V + T(15V) 15 V Symbol VS VZ I1 Min 9 20 Typ Max 15 6 4.5 Unit V V mA Vsat VZ 0.5 21 V V –VT 6.5 7.8 8 9.3 0.45 0.6 VS 100 5 9.5 10.8 mV mV/V V nA * 12V DV V8 II Threshold voltage Input currents Delay time Switch identification Pin 8 Pin 4,6 Switch-on High to low Switch-off Low to high Pin 8 Pin 3,5 mA ms ms td(on) td(off) 6 .


TSM1121 U4790B UPD6453


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