4

CA3059, CA3079

Functional Block Diagram

FIGURE 1. SCHEMATIC DIAGRAM OF CA3059 AND CA3079

AC INPUT VOLTAGE (50/60 OR 400Hz)

V AC

k

Ω

W

24

2

0.5

120

10

2

208/230

20

4

277

25

5

NOTE: Circuitry within shaded areas, not included in CA3079

See chart

IC = Internal connection - DO NOT USE (Terminal restriction applies only to CA3079)

EXTERNAL

INHIBIT

* NTC SENSOR

IC

100

µF

15V

+

-

9

10

11

6

CURRENT

BOOST

IC

IC

INHIBIT

G

* NEGATIVE TEMPERATURE COEFFICIENT

“0”

CROSSING

DET.

TRIAC

GATING

CIRCUIT

4

3

ON/OFF

SENSING

AMPL.

7

8

13

14

PROTECTION

CIRCUIT

1

2

12

LIMITER

5

AC INPUT

VOLTAGE

POWER

SUPPLY

All resistance values are in

Ω

NOTE: Circuitry within shaded areas

not included in CA3079

IC = Internal connection - DO NOT USE (Terminal restriction applies only to

FAIL-SAFE INPUT

TO

COMMON

INHIBIT

INPUT

FOR

EXTERNAL

TRIGGER

COMMON

10K

12K

10K

27K

13

100

µF

15V

COMMON

2

12

1

7

14

10

9

11

8

9.6K

TO

COMMON

15K

25

15

3

4

40K

5K

5

AC

LINE

INPUT

6

TO

THYRISTOR

GATE

FOR

INCREASED

GATE DRIVE

IC

IC

IC

IC

FOR DC MODE

OR 400Hz

OPERATION