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PS2604L Dataheets PDF



Part Number PS2604L
Manufacturers NEC
Logo NEC
Description HIGH ISOLATION VOLTAGE DARLINGTON TRANSISTOR TYPE 6 PIN OPTOCOUPLER
Datasheet PS2604L DatasheetPS2604L Datasheet (PDF)

California Eastern Laboratories Optocoupler Applications DESIGNING FOR OPTOCOUPLERS WITH BASE PIN GENERAL Optocouplers (optical couplers) are designed to isolate electrical output from input for complete elimination of noise. They have been used conventionally as substitutes for relays and pulse transformers. Today's current technology in the area of microcomputers creates new applications for optocouplers. This manual describes the characteristics of typical optocouplers. Also included are n.

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California Eastern Laboratories Optocoupler Applications DESIGNING FOR OPTOCOUPLERS WITH BASE PIN GENERAL Optocouplers (optical couplers) are designed to isolate electrical output from input for complete elimination of noise. They have been used conventionally as substitutes for relays and pulse transformers. Today's current technology in the area of microcomputers creates new applications for optocouplers. This manual describes the characteristics of typical optocouplers. Also included are notes on designing application circuits for typical optocouplers (with a base pin) for better comprehension. NEC's typical optocouplers with or without base pins are listed on the following pages. 1 PS2600 Series Optocouplers (6-Pin Dual-in-Line Package) Internal connection Absolute Maximum Ratings (TA = 25°C) Features BV (Vr.m.s.) High isolation voltage High VCEO (80 V MIN.) Single transistor High isolation voltage High CTR Darlingtontransistor High isolation voltage A.C. input High VCEO (80 V MIN.) Single transistor High isolation voltage A.C. input High CTR Darlingtontransistor High isolation voltage Large input current Single transistor High isolation voltage A.C. input Large input current Single transistor High isolation voltage High VCEO (300 V MIN.) High CTR Darlingtontransitor High isolation voltage High VCEO (80 V MIN.) Single transistor High isolation voltage High CTR Darlingtontransistors IF (mA) IC(mA) CTR (%) Electric Characteristics (TA = 25°C) tr (µs) (TYP) tr (µs) (TYP) Product name PS2601 * PS2601L PS2602 PS2602L PS2603 * PS2603L PS2604 PS2604L PS2605 * PS2605L 5k 80 50 80 to 600 3 5 5k 80 200 200 to 2500 100 100 5k ±80 50 80 to 600 3 5 PS2606 PS2606L PS2607 * PS2607L 5k ±80 200 200 to 3400 100 100 PS2608 PS2608L PS2621 * PS2621L PS2622 PS2622L PS2625 * PS2625L 5k 150 50 20 to 50 3 5 5k ±150 50 20 to 50 3 5 PS2626 PS2626L PS2633 * PS2633L 5k 80 150 1000 to 15000 100 100 PS2634 PS2634L PS2651 * PS2651L2 5k 80 50 50 to 400 3 5 PS2652 PS2652L2 PS2653 * PS2653L2 5k 80 200 200 to 3400 100 100 PS2654 PS2654L2 * (with a base pin) Note: A product name followed by letter L indicates a product having leads formed for surface mount. 2 There are two kinds of optocouplers (a light emitting diode (LED) as an input and a phototransistor as an output) according to the type of output transistor: Single transistor type and Darlington-transistor type. The single-transistor type optocouplers are used to perform high-speed switching (with high-speed response). The Darlingtontransistor type optocouplers are used to obtain a large output current by utilizing a small input current (independently of switching speeds). Designing the circuits properly will improve the PS2601 optocoupler (Single Transistor type) by having a base pin in terms of switching speed, elimination of noise in input signals, and output leakage current (collector dark current, and application to highvoltage circuits). APPLICATIONS OF OPTOCOUPLER BASE PINS INCREASING SWITCHING SPEED The switching speed of an optocoupler with a base pin can be increased by inserting a resistor between the base and the emitter of its phototransistor even when the optocoupler is applied to a large load resistance. Generally, the phototransistor of an optocoupler such as the PS2601 has a large photo-sensitive area on it. Accordingly, the junction capacitance (CC-B) between the collector and the base of the phototransistor is great (up to 20 pF) and as a result its response speed (turn-off time toff) is low. The relationship between turn-off time toff and collector-base capacitance CC-B is expressed by: toff × CC-B x hFE x RL ................(1) where toff : Turn-off time (See Fig. 2-2.) CC-B : Collector-base capacitance hFE : D.C. current amplification factor RL : Load resistance Cc-B RL Figure 2-1. Collector-Base Capacitance CC-B of Phototransistor 3 50% Input ton 90% 90% toff Output 10% 10% Figure 2-2. ton/toff Measuring Points As judged from expression (1), the turn-off time toff is affected by collector-base capacitance CC-B, D.C. current amplification factor hFE, and load resistance LR. In actual circuit design, CC-B and hFE are fixed. Accordingly, the turn-off time is significantly affected by the resistance of load RL. Graph 1 shows the relationship between response speed (ton,toff) and load resistance (RL) in typical emitter follower (test circuit 1) having a load resistance of 100 Ω. = 100 µs ( PW Duty = 1/10 ) VCC = 5 V PS2601 IF = 5 mA Input monitor Vo Input monitor 51 Ω RL = 100 Ω Vo Test Circuit 1 Graph 1 Up : Input 0.2 V/DIV DOWN : Output 0.5 V/DIV (50 µs/DIV) 4 Graph 2 shows the relationship between response speed (ton, toff) and load resistance (RL) in a typical emitter follower (Test circuit 2) having a greater load resistance (5 kΩ). VCC = 5 V PS2601 IF = 5 mA Input monitor 51 Ω Vo RL = 5 Ω Input monitor Test Circuit 2 Vo Graph 2 Up : Input 0.2 V/DIV DOWN : Output 2.


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