AC08FSM datasheet(190/223 Pages) TECCOR

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AN1010

Application Notes

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AN1010 - 2

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Thyristor Product Catalog

Figure AN1010.2

120 V ac Triac/Diac Circuit

Figure AN1010.3 illustrates a circuit using a sidac (a simpler thy-

ristor) phase control network to ignite a 120 V ac fluorescent

lamp. As in the triac/diac circuit, the 5 µF ac capacitor is charged

and added to the peak line voltage, developing greater than

200 V peak or 400 V peak to peak. Since the sidac is a voltage

breakover (VBO) activated device with no gate, a charging net-

work is essential in this circuit to charge the capacitor above the

peak of the line in order to break over (turn on) the sidac with a

VBO of 220 V to 250 V.

As the sidac turns on each half cycle, the filaments are pre-

heated and in less than 1.5 seconds the lamp is lit. Once the

lamp is lit, the voltage across it clamps to approximately 60 V

peak (for a 15 W to 20 W lamp), and the sidac ceases to function

until the lamp is required to be ignited again.

Figure AN1010.3

120 V ac Sidac Circuit

The circuits illustrated in Figure AN1010.2 and Figure AN1010.3

use 15 W to 20 W lamps. The same basic circuits can be applied

to higher wattage lamps. However, with higher wattage lamps the

voltage developed to fire (light) the lamp will need to be some-

what higher. For instance, a 40 W lamp is critical on line input

voltage to ignite, and after it is lit the voltage across the lamp will

clamp to approximately 130 V peak. For a given type of lamp, the

current must be limited to constant current regardless of the watt-

age of the lamp.

Figure AN1010.4 shows a circuit for igniting a fluorescent lamp

with 240 V line voltage input using triac and diac networks.

120 V ac

Line

Input

Lamp

15 W - 20 W

Optional

Charging

Network

5 µF

400 V

0.047 µF

50 V

220 k

HT-32

MT1

MT2

Q401E4

Ballast

14 W - 22 W

1N4004

47 k

120 V ac

Line

Input

Lamp

15 W - 20W

K2400E

Sidac

Optional

Charging

Network

5 µF

400 V

Ballast

14 W - 22W

1N4004

47 k

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