IL410/ IL4108
Vishay Semiconductors
Parameter
Critical rate of rise of off-state
voltage
Critical rate of rise of voltage at
current commutation
Test condition
V
D
= 0.67 V
DRM
, T
J
= 25 °C
V
D
= 0.67 V
DRM
, T
J
= 80 °C
V
D
= 0.67 V
DRM
,
dI/dt
crq
≤
15 A/ms, T
J
= 25 °C
V
D
= 0.67 V
DRM
,
dI/dt
crq
≤
15 A/ms, T
J
= 80 °C
Critical rate of rise of on-state
Thermal resistance, junction to
ambient
Part
Symbol
dV/dt
cr
dV/dt
cr
dV/dt
crq
dV/dt
crq
dI/dt
cr
R
thja
Min
10000
5000
10000
5000
8.0
150
Typ.
Max
Unit
V/µs
V/µs
V/µs
V/µs
A/µs
°C/W
Coupler
Parameter
Critical rate of rise of coupled
input/output voltage
Common mode coupling
capacitance
Capacitance (input-output)
Isolation resistance
f = 1.0 MHz, V
IO
= 0 V
V
IO
= 500 V, T
amb
= 25 °C
V
IO
= 500 V, T
amb
= 100 °C
Test condition
I
T
= 0 A, V
RM
= V
DM
= V
D(RMS)
Symbol
dV
IO
/dt
C
CM
C
IO
R
IO
R
IO
Min
Typ.
10000
0.01
0.8
≥
10
12
≥
10
11
Max
Unit
V/µs
pF
pF
Ω
Ω
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.
1
Cs(µF) = 0.0032 (µF)* 10^(0.0066IL (mA)
Cs - Shunt Capacitance -
µF
.1
.01
Ta = 25°C, PF = 0.3
IF = 2.0 mA
.001
0
iil410_01
50
100
150
200
250
300
350
400
IL - Load Current - mA(RMS)
Figure 1. Shunt Capacitance vs. Load Current
www.vishay.com
4
Document Number 83627
Rev. 1.4, 26-Apr-04
VISHAY [ VISHAY TELEFUNKEN ]
