IL4108(2008) Просмотр технического описания (PDF) - Vishay Semiconductors

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Компоненты Описание

производитель

IL4108
(Rev.:2008)

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

Vishay Semiconductors 

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iil410_15

IL410/IL4108

Optocoupler, Phototriac Output, Zero Vishay Semiconductors

Crossing,

High dV/dt, Low Input Current

here as a driver and thus enables the driving of thyristors and

triacs of higher performance by microprocessors. The driving

500 µH

current pulse should not exceed the maximum permissible

surge current of the IL410/IL4108. For this reason, the

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IL410/IL4108 without zero voltage switch often requires

current limiting by a series resistor.

The favorably low latching current in this operating mode

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22 nF

220 V~

results in AC current switches which can handle load

currents from some milliamperes up to high currents.

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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.

Fig. 15 - 3 - Connect a Choke of Low Winding Cap. in Series, e.g., a

Ringcore Choke, with Higher Load Currents

Note

Measures 2 to 3 are especially required for the load separated from

the IL410/IL4108 during operation. The above mentioned effects do

not occur with IL410/IL4108 circuits which are connected to the line

by transformers and which are not mechanically interrupted.

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

corresponding 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 trigger 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

milliseconds only. The shortest times of 5.0 to 10 ms can be

achieved for an overdrive greater or equal than 10. The

trigger delay time rises with an increase in temperature.

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

correspondingly higher control current must be used. Only

the IL410/IL4108 without zero voltage switch is suitable for

this operating mode.

ZERO VOLTAGE SWITCH

The IL410/IL4108 with zero voltage switch can only be

triggered during the zero crossing the sine AC voltage. 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

Document Number: 83627

Rev. 1.6, 09-Jan-08

For technical questions, contact: optocoupler.answers@vishay.com

www.vishay.com

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