©2003 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FODM30XX Rev. 1.0.6

6

Typical Application Information

Figure 8. Static dv/dt Test Circuit

Figure 9. Resistive Load

Vdc

600V (FODM3052)

(FODM3053)

400V (FODM3022)

(FODM3023)

250V (FODM3011)

(FODM3012)

R = 10 k

Ω

X100

SCOPE

PROBE

PULSE

INPUT

MERCURY

WETTED

RELAY

0 VOLTS

APPLIED VOLTAGE

WAVEFORM

Vmax =

dv/dt =

0.63 Vmax

D.U.T.

D.U.T.

τRC

τRC

1

2

4

3

0.1

µF

180

C1

2.4k

120 V

60 Hz

FODM3011

FODM3012

FODM3022

FODM3023

FODM3052

FODM3053

1

2

4

3

120 V

60 Hz

180

FODM3011

FODM3012

FODM3022

FODM3023

FODM3052

FODM3053

600 V (FODM3052, FODM3053)

= 400 V (FODM3022, FODM3023)

= 250 V (FODM3011, FODM3012)

=

378

τRC (FODM3053)

(FODM3052)

=

252

τRC (FODM3023)

(FODM3022)

=

158

τRC (FODM3011)

(FODM3012)

1. The mercury wetted relay provides a high speed

repeated pulse to the D.U.T.

2. 100x scope probes are used, to allow high speeds and

voltages.

3. The worst-case condition for static dv/dt is established by

triggering the D.U.T. with a normal LED input current,

dv/dt to be gradually increased until the D.U.T. continues

to trigger in response to the applied voltage pulse, even

after the LED current has been removed. The dv/dt is

then decreased until the D.U.T. stops triggering.

measured at this point and recorded.

NOTE: This optoisolator should not be used to drive a load directly. It is

intended to be a trigger device only.