6 PIN DIP ZERO CROSS TRIAC DRIVER
PHOTOCOUPLER
Figure 10. Static dv/dt Test Circuit & Waveform
D.U.T.
A
K
Zero
Crossing
Circuit
EL303X Series
EL304X Series
EL306X Series
EL308X Series
T1
10
kΩ
R
TEST
V
T
C
TEST
50
Ω
High Voltage
Pulse Source
T2
Applied V
T
Waveform
V
PEAK
0.632 x V
PEAK
0
τ
RC
Measurement Method
The high voltage pulse is set to the required V
PEAK
value and applied to the D.U.T. output side through the RC
circuit above. LED current is not applied. The waveform V
T
is monitored using a x100 scope probe. By
varying R
TEST
, the dv/dt (slope) is increased, until the D.U.T. is observed to trigger (waveform collapses). The
dv/dt is then decreased until the D.U.T. stops triggering. At this point,
τ
RC
is recorded and the dv/dt
calculated.
dv/dt =
0.632 x V
PEAK
τ
RC
For example, V
PEAK
= 600V for EL306X series. The dv/dt value is calculated as follows:
dv/dt =
0.63 x 600
τ
RC
378
=
τ
RC
Everlight Electronics Co., Ltd.
Document No：PDS-ELZC-001 Rev.0
6
http:\\www.everlight.com
February 22, 2008
EVERLIGHT [ EVERLIGHT ELECTRONICS CO., LTD ]
