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| U4790B Automotive Lamp-Outage Monitor, VT = 8 mV, VZ(3,5) = 22V 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 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 Ordering Information Extended Type Number U4790B Package DIP8 Remarks Rev. A3, 09-Apr-01 1 (5) U4790B Pin Description Input switch VRef IN2 OUT1 Pin 1 2 3 4 5 IN1 4 95 10634 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 1 2 3 8 7 6 5 6 7 8 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 Tamb = 95 C Tamb = 60 C Ambient temperature range Storage temperature range Junction temperature DIP 8 DIP 8 Pin 2, 7 Pin 1 Pin 3, 5 Pin 4, 6 -V4,6 Ptot Ptot Tamb Tstg Tj 6 420 690 -40 to +95 -55 to +125 150 V mW mW C C C Symbol VS I1 I3,5 Value 16.5 1.5 20 Unit V A mA Thermal Resistance Parameters Junction ambient DIP8 Symbol RthJA Value 110 Unit K/W 2 (5) Rev. A3, 09-Apr-01 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 Output saturation voltage Output Z diodes Z3, Z5 Control signal threshold Test Conditions / Pin Pin 2,7 Pin 2 VS = 12 V Pin 1 measured at Pin 1 (GND) VS = 9 V, I3,5 = 10 mA Tamb = 25 C Pin 3,5 Pin 3,5 Reference point Pin 7 (V7) I3,5 = 3 mA Pin 4,6 VS = 12 V VS = 15 V VT(15V) * VT(12V) 15 V * 12V Symbol VS VZ I1 Min 9 20 Typ Max 15 Unit V V mA 4.5 6 Vsat VZ 21 0.5 V V -VT DV V8 II 6.5 7.8 8 9.3 0.45 0.6 VS 100 5 9.5 10.8 mV mV/V V nA mA ms ms Voltage drift Threshold voltage Input currents p Delay time DV + Pin 4,6 Switch identification Pin 8 Pin 4,6 , Pin 8 Switch-on High to low Switch-off Low to high Pin 3,5 td(on) td(off) 6 30 95 10624 V4,6 12.00 11.95 V td(off) V0 12 6 V 0 10 20 30 40 50 td(on) 60 ms t Figure 3. Rev. A3, 09-Apr-01 3 (5) U4790B 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 0.58 0.48 7.62 8 5 2.54 3.3 0.36 max 9.8 8.2 technical drawings according to DIN specifications 13021 1 4 4 (5) Rev. A3, 09-Apr-01 U4790B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 Rev. A3, 09-Apr-01 5 (5) |
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