IL4108 Просмотр технического описания (PDF) - Vishay Semiconductors

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Компоненты Описание

производитель

IL4108

Optocoupler, Phototriac Output, Zero Crossing, High dV/dt, Low Input Current

Vishay Semiconductors 

IL410/ IL4108

Vishay Semiconductors

connected to the line by transformers and which are not mechani-

cally interrupted.

In such cases as well as in applications with a resistive load the cor-

responding protective circuits can be neglected.

Control And Turn-On Behavior

The trigger current of the IL410/ IL4108 has a positive

temperature gradient. The time which expires from

applying the control current to the turn-on of the load

current is defined as the trigger delay time (tgd). On

the whole this is a function of the overdrive meaning

the ratio of the applied control current versus the trig-

ger current (IF/IFT). If the value of the control current

corresponds to that of the individual trigger current of

IL410/4108 turn-on delay times amounts to a few mil-

liseconds only. The shortest times of 5.0 to 10 µs can

be achieved for an overdrive greater or equal than 10.

The trigger delay time rises with an increase in tem-

perature.

For very short control current pulses (tplF < 500 µs) a

correspondingly higher control current must be used.

Only the IL410/ IL4108 without zero voltage switch is

suitable for this operating mode.

Application Note

• Over voltage protection: A voltage-limiting varistor

(e.g. SIO VS05K250) which directly connected to the

IL410/ IL4108 can protect the component against

overvoltage.

Zero Voltage Switch

The IL410/ IL4108 with zero voltage switch can only

be triggered during the zero crossing the sine AC volt-

age. This prevents current spikes, e.g. when turning-

on cold lamps or capacitive loads.

Applications

Direct switching operation: The IL410/ IL4108 switch

is mainly suited to control synchronous motors,

valves, relays and solenoids in Grätz circuits. Due to

the low latching current (500 µA) and the lack of an

RC circuit at the output, very low load currents can

easily be switched.

Indirect switching operation: The IL410/ IL4108

switch acts here as a driver and thus enables the driv-

ing of thyristors and triacs of higher performance by

microprocessors. The driving current pulse should not

exceed the maximum permissible surge current of the

IL410/ IL4108. For this reason, the IL410/ IL4108

without zero voltage switch often requires current lim-

iting by a series resistor.

The favorably low latching current in this operating

mode results in AC current switches which can handle

load currents from some milliamperes up to high cur-

rents.

www.vishay.com

8

Document Number 83627

Rev. 1.4, 26-Apr-04

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