6

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FODM306X/FODM308X Rev. 1.0.4

Typical Performance Curves

Figure 8. Static dv/dt Test Circuit

Vdc

800V (FODM3082)

(FODM3083)

600V (FODM3062)

(FODM3063)

R = 10 k

Ω

X100

SCOPE

PROBE

PULSE

INPUT

MERCURY

WETTED

RELAY

378V (FODM3062, FODM3063)

504V (FODM3082, FODM3083)

0 VOLTS

APPLIED VOLTAGE

WAVEFORM

Vmax =

dv/dt =

0.63 Vmax

D.U.T.

D.U.T.

τRC

τRC

= 800V (FODM3082, FODM3083)

= 600V (FODM3062, FODM3063)

=

378

=

504

τRC

(FODM3082, FODM3083)

Figure 9. Hot-Line Switching Application Circuit

0.01

1

2

4

3

240 VAC

HOT

NEUTRAL

360

Ω

330

FODM3062

FODM3063

FODM3082

FODM3083

39*

LOAD

Typical circuit for use when hot line switching of 240VAC

is required. In this circuit the “hot” side of the line is

switched and the load connected to the cold or neutral

side. The load may be connected to either the neutral or

hot line.

part, 5mA for the FODM3063/83 and 10mA for the

FODM3062/82. The 39

Ω resistor and 0.01µF capacitor are

for snubbing of the triac and may or may not be necessary

depending upon the particular triac and load used.

Note:

This optoisolator should not be used to drive a load directly. It is intended to be a trigger device only.

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, then

removing the current. The variable RTEST allows the 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. tRC is measured at this point

and recorded.

Figure 10. Inverse-Parallel SCR Driver Circuit (240VAC)

1

2

4

3

240 VAC

SCR

360

Ω

R1

D1

SCR

R2

D2

LOAD

Suggested method of firing two, back-to-back

SCR’s, with a Fairchild triac driver. Diodes can

be 1N4001; resistors, R1 and R2, are optional

330 ohms.

Note:

This optoisolator should not be used to drive a load directly. It is intended to be a trigger device only.

FODM3062

FODM3063

FODM3082

FODM3083