Datasheet

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4
Document Number 83627
Rev. 1.4, 26-Apr-04
VISHAY
IL410/ IL4108
Vishay Semiconductors
Coupler
Power Factor Considerations
A snubber isn’t needed to eliminate false operation of
the TRIAC driver because of the IL410/ IL4108’s high
static and commutating dV/dt with loads between 1.0
and 0.8 power factors. When inductive loads with
power factors less than 0.8 are being driven, include
a RC snubber or a single capacitor directly across the
device to damp the peak commutating dV/dt spike.
Normally a commutating dV/dt causes a turning-off
device to stay on due to the stored energy remaining
in the turning-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 1. Note that the value of
the capacitor increases as a function of the load cur-
rent.
Critical rate of rise of off-state
voltage
V
D
= 0.67 V
DRM
, T
J
= 25 °C dV/dt
cr
10000 V/µs
V
D
= 0.67 V
DRM
, T
J
= 80 °C dV/dt
cr
5000 V/µs
Critical rate of rise of voltage at
current commutation
V
D
= 0.67 V
DRM
,
dI/dt
crq
≤ 15 A/ms, T
J
= 25 °C
dV/dt
crq
10000 V/µs
V
D
= 0.67 V
DRM
,
dI/dt
crq
≤ 15 A/ms, T
J
= 80 °C
dV/dt
crq
5000 V/µs
Critical rate of rise of on-state dI/dt
cr
8.0 A/µs
Thermal resistance, junction to
ambient
R
thja
150 °C/W
Parameter Test condition Symbol Min Ty p. Max Unit
Critical rate of rise of coupled
input/output voltage
I
T
= 0 A, V
RM
= V
DM
= V
D(RMS)
dV
IO
/dt 10000 V/µs
Common mode coupling
capacitance
C
CM
0.01 pF
Capacitance (input-output) f = 1.0 MHz, V
IO
= 0 V C
IO
0.8 pF
Isolation resistance V
IO
= 500 V, T
amb
= 25 °C R
IO
≥ 10
12
Ω
V
IO
= 500 V, T
amb
= 100 °C R
IO
≥ 10
11
Ω
Parameter Test condition Part Symbol Min Typ. Max Unit
Fig. 1 Shunt Capacitance vs. Load Current
iil410_01
400350300250200150100500
.001
.01
.1
1
IL - Load Current - mA(RMS)
Cs - Shunt Capacitance - µF
Cs(µF) = 0.0032 (µF)* 10^(0.0066IL (mA)
Ta = 25°C, PF = 0.3
IF = 2.0 mA