IL4116_04 查看數據表（PDF） - Vishay Semiconductors

零件编号

产品描述 (功能)

生产厂家

IL4116_04

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

Vishay Semiconductors 

IL4116/ IL4117/ IL4118

Vishay Semiconductors

10000

1000

100

Duty Factor

.005

.01

.02

.05

.1

.2

.5

τ

t

DF =τ/t

10

10-6 10-5 10-4 10-3 10-2 10-1 10 0 101

iil4116_03

t -LED Pulse Duration - s

Figure 3. Peak LED Current vs. Duty Factor, Tau

150

100

50

0

-60 -40 -20 0 20 40 60

iil4116_04

TA - Ambient Temperature - °C

80 100

Figure 4. Maximum LED Power Dissipation

iil4116_05

VT - On-State Voltage - V(RMS)

Figure 5. On-State Terminal Voltage vs. Terminal Current

iil4116_06

TA - Ambient Temperature - °C

Figure 6. Maximum Output Power Dissipation

Power Factor Considerations

A snubber isn’t needed to eliminate false operation of

the TRIAC driver because of the IL4116/ IL4117/

IL4118 high static and commutating dV/dt with loads

between 1 and 0.8 power factors. When inductive

loads with power factors less than 0.8 are being

driven, include an RC snubber or a single capacitor

directly across the device to damp the peak commu-

tating dV/dt spike. Normally a commutating dV/dt

causes a turning-off device to stay on due to the

stored energy remaining in the turn-off device.

But in the case of a zero voltage crossing optotriac,

the commutating dV/dt spikes can inhibit one half of

the TRIAC from turning on. If the spike potential

exceeds the inhibit voltage of the zero cross detection

circuit, half of the TRIAC will be held-off and not turn-

on. This hold-off condition can be eliminated by using

a snubber or capacitor placed directly across the

optotriac as shown in Figure 7. Note that the value of

the capacitor increases as a function of the load cur-

rent.

The hold-off condition also can be eliminated by pro-

viding a higher level of LED drive current. The higher

LED drive provides a larger photocurrent which

causes. the phototransistor to turn-on before the com-

mutating spike has activated the zero cross network.

Figure 8 shows the relationship of the LED drive for

power factors of less than 1.0. The curve shows that

if a device requires 1.5 mA for a resistive load, then

1.8 times (2.7 mA) that amount would be required to

control an inductive load whose power factor is less

than 0.3.

Document Number 83628

Rev. 1.4, 26-Apr-04

www.vishay.com

5

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