Datenblatt-Suchmaschine für elektronische Bauteile |
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AD22001 Datenblatt(PDF) 3 Page - Analog Devices |
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AD22001 Datenblatt(HTML) 3 Page - Analog Devices |
3 / 8 page AD22001 REV. A –3– SWITCH & VOLTAGE LIMITER INTERNAL POWER SUPPLY POWER SUPPLY OUTPUT SIGNAL OUT GND 2 1 CAR BATTERY FUSE SWITCH COPPER SHUNT LIGHT BULB CE –IN +IN NOTES 1. TEMPERATURE COMPENSATION FOR COPPER SHUNT RESISTOR AND SUPPLY VOLTAGE COMPENSATION. 2. CURRENT SOURCE FOR COLD BULB CHECKING (AVAILABLE IN CHANNELS 1, 2, 3 AND 4). +V S V INCE V INF I INB V INDIFF I INB IN FUSE I INC Figure 2. Typical Block Diagram of One Channel and Power Supply Control The AD22001 has internal linear signal processing that compen- sates the comparator threshold voltage as the resistance of the copper shunt resistor changes with varying temperature. The comparator thresholds are also adjusted to compensate for changes in lamp current due to power supply variations. The AD22001 was designed for a common automotive lamp monitoring application. The connection diagram (Figure 3) and the application suggestion (Figure 4) show the different combi- nations of functions that are performed for each channel. FUNCTIONAL DESCRIPTION The AD22001 consists of fine sensitive comparators with built-in offset plus biasing and support for comprehensive lamp circuit monitoring. The comparators are arrayed as a single and two groups of two (as shown in Figure 3) arranged to meet a variety of requirements. Two or more AD22001s can be combined. The comparators are basically similar with additional features according to their place in the array. Hot Lamp Test Each comparator has a differential input with built-in threshold of 1.75 mV, under nominal operating conditions. The compara- tors are intended to monitor the voltage developed across a low resistance shunt by a lamp current. The comparators are active whenever they are connected to the battery circuit. They indi- cate normal or okay (the series circuit to the lamp is intact) when the threshold voltage of 1.75 mV is exceeded. This occurs when the +input is driven negative with respect to the –input by a voltage greater than the threshold. They also indicate normal if they are not activated by common-mode battery voltage, whether the threshold voltage is exceeded or not. They indicate a fault if the common-mode is applied but the threshold is not exceeded. ABSOLUTE MAXIMUM RATINGS* Forward Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . +36 V Reversed Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . –34 V Forward Transient (40 ms) . . . . . . . . . . . . . . . . . . . . . . +60 V Reverse Transient (40 ms) . . . . . . . . . . . . . . . . . . . . . . . –40 V Voltage on Any Input Pin Relative to GND . . . –34 V to +36 V Power Dissipation (VS = 13.5 V) . . . . . . . . . . . . . . . . 300 mW Operating Temperature (Ambient) . . . . . . . –40 °C to +125°C Storage Temperature . . . . . . . . . . . . . . . . . . –65 °C to +150°C *Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, the functional operation of the device at these or any other conditions above 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. ORDERING INFORMATION Temperature Package Model Range Option* AD22001N –40 °C to +125°C N-20 *N = Plastic DIP Package. CONNECTION DIAGRAM 1 2 3 4 5 6 7 8 9 10 11 20 19 18 17 16 15 14 12 13 TOP VIEW (Not to Scale) AD22001N CE –IN 1 +IN 1 FUSE 1 + 2 OUT 1 + 2 +IN 2 –IN 2 +IN 3 GND FUSE 5 OUT 5 +IN 5 –IN 5 +IN 4 –IN 4 OUT 3 + 4 OUT (3 × 4) –IN 3 POWER OUT +V S PRODUCT DESCRIPTION The AD22001’s five comparators each monitor the voltage across a current sensing shunt resistor which is part of a lamp circuit. Each comparator has a small threshold voltage, nomi- nally 1.75 mV. The output of the comparator will change state as the voltage developed across the shunt (by the lamp current) crosses the threshold level. Because the threshold voltage is very small, copper tracks on the PC board can be used as shunt resis- tors with low power dissipation. |
Ähnliche Teilenummer - AD22001 |
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Ähnliche Beschreibung - AD22001 |
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