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LS7538-LS7539
LS7538-LS7539

... (1) Resistor should be placed adjacent to Pin 1. NOTE 1: Connect MODE (Pin 6) for desired Brightness Step Sequence (See Table 1). NOTE 2: A good PCB layout using through-hole components will provide protection for ESD introduced at the Touch Plate in the range of 25kV. Using surface mount components ...
BDTIC www.BDTIC.com/infineon Resonant LLC Converter: Operation and Design 250W 33Vin 400Vout Design Example
BDTIC www.BDTIC.com/infineon Resonant LLC Converter: Operation and Design 250W 33Vin 400Vout Design Example

... represent heavier loads. It’s also seen that all Q curves (load conditions) cross at the resonant frequency point (at Fx=1 or fs=fr) and have a unity gain. Figure 2.3 shows that all gain curves has peaks which define the boundary between the inductive and capacitive impedances of the resonant tank, ...
Isolation and Regulation Transformer Operating Principles and
Isolation and Regulation Transformer Operating Principles and

... unchanging voltage) dv/dt is zero and the current is also zero. Thus, capacitors block direct currents. As dv/dt increases or, as sinusoidal frequency increases, the current also increases for a constant capacitance. Thus, a capacitor blocks DC and passes AC. Because a capacitor is constructed with ...
ADC12C080 12-Bit, 65/80 MSPS A/D Converter (Rev. C)
ADC12C080 12-Bit, 65/80 MSPS A/D Converter (Rev. C)

... analog-to-digital converter capable of converting analog input signals into 12-bit digital words at rates up to 80 Mega Samples Per Second (MSPS). This converter uses a differential, pipelined architecture with digital error correction and an on-chip sampleand-hold circuit to minimize power consumpt ...
74CBTLV3245 8-bit bus switch with output enable
74CBTLV3245 8-bit bus switch with output enable

MP1470 - Monolithic Power System
MP1470 - Monolithic Power System

milltronics
milltronics

... field, it distorts the flux causing it to cut the coil windings, thereby generating a voltage. This voltage is proportional to the speed at which the ferrous target passes through the flux and is inversely proportional to the square of the distance between the target and the probe. Square profile ta ...
Unit 2 Amplifier introduction
Unit 2 Amplifier introduction

... magnitude of a signal (either voltage, current or both) and is one of the most important operations in electronics. In this section, we look at the basic concept of a linear amplifier system. A linear amplifier produces a magnified replica (amplification) of the input signal in order to produce a us ...
C. a pn junction. - E
C. a pn junction. - E

... Forwardbias=a voltage applied to a circuit or device, esp. a semiconductor device, in the direction that produces the larger current. Hole=a vacant position in an atom left by the absence of a valence electron. Intrinsic=a semiconductor which is not doped. Intrinsic semiconductor=an almost pure semi ...
Contact resistance and TLM measurements
Contact resistance and TLM measurements

... At the edge of the contact, the current flowing in (or out) is significant. Moving away from that edge, the current drops off until, at the far edge, there is no current. This is known as “current crowding”. An analysis of current crowding shows that the drops off in an exponential fashion with a ch ...
Inductors - La Salle University
Inductors - La Salle University

... Periodic Behavior of LC Circuit (Cont.) • Eventually we reach the same situation we started with – a charged capacitor and no current (just that the plates have the opposite charge from before) and the process starts over again. • Another way to view the process is in terms of energy. The capacitor ...
DOC
DOC

(800) 631-2148 - US Thank you for using our
(800) 631-2148 - US Thank you for using our

Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger General Description Benefits and Features
Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger General Description Benefits and Features

... Battery-protection features include: low-voltage prequalification, charge fault timer, die temperature monitoring, and battery temperature monitoring. The battery temperature monitoring adjusts the charge current and termination voltage for safe use of secondary lithium-ion batteries. The IC accepts ...
Power Line Carrier Communications and its Interest in the
Power Line Carrier Communications and its Interest in the

... a parallel communication system in order to give a successful response to its problems. A. Industrial Automation: In an industrial environment the PLC communication networks can be used to give electric energy related services, such as meter reading, demand management and remote billing but also to ...
LYTSwitch-4 Family - Power Integrations
LYTSwitch-4 Family - Power Integrations

... The VOLTAGE MONITOR pin has a 1 V threshold comparator connected at its input. This voltage threshold is used for remote ON/OFF control. When a signal is received at the VOLTAGE MONITOR pin to disable the output (VOLTAGE MONITOR pin tied to ground through an optocoupler phototransistor) the LYTSwitc ...
Electricity - School
Electricity - School

... State the interval between measurements Identify anomalous results and describe how to deal with them Calculate the mean of a set of results Assess the precision of a measuring device Explain how to improve the precision of results Identify directly proportional relationships Identify directly propo ...
EVS-05-04e
EVS-05-04e

... and enclosures provided for protecting the occupants from direct contact with live parts. "Protection IPXXB" means protection from contact with high voltage live parts provided by either an electrical protection barrier or an enclosure and tested using a Jointed Test Finger (IPXXB) as described in 7 ...
Chapter 21 Analog Input and Temperature Measurement
Chapter 21 Analog Input and Temperature Measurement

... thermocouple to choose: J、K、T、E、N、B、R、S; And there are only two types of RTD sensor: PT-100 and PT-1000. This combination measurement module occupied 4 numerical input registers and 8 points digital output. The maximum measureable temperature point of a PLC main unit is 32 points. The update rate fo ...
Evaluate:  MAX4444/MAX4445 MAX4444 Evaluation Kit General Description Features
Evaluate: MAX4444/MAX4445 MAX4444 Evaluation Kit General Description Features

... Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect a +5V power supply to the VCC pin and a -5V power supply to the VEE pin. Connect power-supply ground to the GND pads. 2) Ensure that the shunt is installed on jumper JU1. 3) ...
How to Read an 100mV/A Inductive Pick up
How to Read an 100mV/A Inductive Pick up

... “open circuit” voltage. There is no significant load (only parasitic) on the battery. This test is a sign of the battery’s “health”. The chart to the right shows what “state of charge” a battery is in based on the open circuit voltage tested. The minimum voltage you should accept as a base line for ...
RIGOL  User’s Guide DP1308A
RIGOL User’s Guide DP1308A

... So please keep well ventilated and inspect the intake and fan regularly. Do Not Operate in Wet Conditions. In order to avoid short circuiting to the interior of the device or electric shock, please do not operate in a humid environment. Do Not Operate in an Explosive Atmosphere. In order to avoid da ...
DS8024 Smart Card Interface General Description Features
DS8024 Smart Card Interface General Description Features

... I/O TRANSCEIVER ...
Industrial Current/Voltage Output Driver with Programmable Ranges AD5748
Industrial Current/Voltage Output Driver with Programmable Ranges AD5748

SEL-451-Based Autosynchronizer Data Sheet
SEL-451-Based Autosynchronizer Data Sheet

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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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