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MID400 Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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MID400 Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 11 page AC LINE MONITOR LOGIC-OUT DEVICE MID400 7/24/03 Page 4 of 11 © 2003 Fairchild Semiconductor Corporation The input of the MID400 consists of two back-to-back LED diodes which will accept and convert alternating currents into light energy. An integrated photo diode-detector amplifier forms the output network. Optical coupling between input and output provides 2500 VRMS voltage isolation. A very high current transfer ratio (defined as the ratio of the DC output current and the DC input cur- rent) is achieved through the use of high gain amplifier. The detector amplifier circuitry operates from a 5 V DC supply and drives an open collector transistor output. The switching times are intentionally designed to be slow in order to enable the MID400, when used as an AC line monitor, to respond only to changes in input voltage exceeding many milliseconds. The short period of time during zero-crossing which occurs once every half cycle of the power line is completely ignored. To operate the MID400, always add a resistor, RIN, in series with the input (as shown in test circuit 1) to limit the current to the required value. The value of the resistor can be determined by the following equation: Where VIN (RMS) is the input voltage. VF is the forward voltage drop across the LED. IIN (RMS) is the desired input current required to sustain a logic “O” on the output. DESIGNATION PIN # FUNCTION VIN1, VIN2 1,3 Input terminals VCC 8 Supply voltage, output circuit. AUX. 7 Auxiliary terminal. Programmable capacitor input to adjust AC voltage sensing level and time delay. VO 6 Output terminal; open collector. GND 5 Circuit ground potential. ISOLATION CHARACTERISTICS (TA = 25°C) Characteristics Test Conditions Symbol Min Typ Max Units Steady State Isolation Voltage Relative Humidity ≤ 50%, II-O ≤ 10 µA, 1 Minute, 60 Hz VISO 2500 VRMS Isolation Resistance (VI-O = 500 VDC) RISO 1011 Ω Isolation Capacitance (f = 1 MHz) CISO 2pF DESCRIPTION / APPLICATIONS PIN DESCRIPTION R IN V IN V F – I IN ----------------------- = 4 5 1 VIN1 VIN2 VCC AUX. GND VO 2 3 8 7 6 NOTE: DO NOT CONNECT PINS 2 AND 4 SCHEMATIC DIAGRAM |
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