©2004 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FOD420, FOD4208, FOD4216, FOD4218 Rev. 1.1.5

4

Notes:

2. Test voltage must be applied within dv/dt rating.

4. This is static dv/dt. See Figure 11 for test circuit. Commutating dv/dt is a function of the load-driving thyristor(s) only.

and Pins 4, 5 and 6 are common.

Typical Application

Typical circuit for use when hot line switching 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, 2mA for FOD420 and FOD4208, 1.3mA for

FOD4216 and FOD4218. 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 use.

Figure 1. Hot-Line Switching Application Circuit

0.01

µF

1

2

3

6

5

4

240 VAC

HOT

FKPF12N80

NEUTRAL

360

Ω

* For highly inductive loads (power factor < 0.5), change this value to 360 ohms.

330

Ω

FOD420

FOD4208

FOD4216

FOD4218

39*

Ω

LOAD