P

115VAC

OR

220VAC

N

LOAD

C1

T

L

C2

R1

R2

A

B

R8

R3

C5

D1

1

2

3

4

8

7

6

5

R4

C3

C4

EXT SENS

+

SEE NOTE 4

LS7232ND

R6

R5

SEE NOTE 3

FIGURE 5. A Typical Lamp Dimmer

G

Z

-

ELECTRONIC

EXTENSION

(FIG. 6)

EXTN

P

C7

SEE NOTE 5

SEE NOTE 2

R7

C6

NOTES

1) All circuits connected by broken lines are optional.

2) C7 is used only with electronic extension and R7 is used only with mechanical switch.

3) See I/O Description for MODE (Pin 2)

4) Use Connection A when Neutral is not available. Use Connection B when Neutral is available.

5) Connection between Pin 6 & Pin 7 should be broken when EXT is used.

TOUCH

PLATE

MT2

MT1

APPLICATION EXAMPLE:

A typical implementation of a lamp dimmer circuit is shown

in Fig. 5. Here the brightness of the lamp is set by touching

the Touch Plate. The functions of different components are

as follows:

•

The 15V DC supply for the chip is provided by Z, D1,

R1, C2 and C5.

•

R2 and C4 generate the filtered signal for the SYNC

input for synchronizing the internal PLL with the line

frequency.

•

R3 and C7 act as a filter circuit for the electronic

extension. If extensions are not used, the EXT input

•

R4, R5, R6 set up the sensitivity of the SENS input.

C6 provides noise filtering.

•

C3 is the filter capacitor for the internal PLL.

•

R8 provides current limiting and isolation between the

chip output and the triac gate.

•

C1 and L are RF filter circuits.

In the case of momentary power failure, the circuit state

remains unchanged for a period of up to 1 sec. For longer

power interruptions, the output is shut off.

C1 = 0.15µF, 200V

R4 = 1M

Ω to 5MΩ, 1/4W

C2 = 0.33µF, 200V

(Select for sensitivity)

C3 = 0.047µF, 25V

R5, R6 = 2.7M

Ω, 1/4W

C4 = 470pF, 25V

R7 = 150k

Ω, 1/4W

C5 = 47µF, 25V

R8 = 100

Ω, 1/4W

C6 = 680pF, 25V

D1 = IN4148

C7 = 0.1µF, 25V

Z = 15V, 1W (Zener)

R1 = 270

Ω, 1W

T = Q4006L4 Triac (Typical)

R2 = 1.5M

Ω, 1/4W

L = 100µH (RFI Filter)

R3 = 1.5M

Ω, 1/4W

(1) For Connection A. Use 0.22µF for Connection B.

(2) For Connection A. Use 1/4W for Connection B.

C1 = 0.15µF, 400V

R4 = 1M

Ω to 5MΩ, 1/4W

C2 = 0.22µF, 400V

(Select for sensitivity)

C3 = 0.047µF, 25V

R5, R6 = 4.7M

Ω, 1/4W

C4 = 470pF, 25V

R7 = 150k

Ω, 1/4W

C5 = 47µF, 25V

R8 = 100

Ω, 1/4W

C6 = 680pF, 25V

D1 = 1N4148

C7 = 0.1µF, 25V

Z = 15V, 1W (Zener)

R1 = 1k

Ω, 2W

T = Q5004L4 Triac (Typical)

R2 = 1.5M

Ω, 1/4W

L = 200µH (RFI Filter)

R3 = 1.5M

Ω, 1/4W

(3) For Connection A. Use 0.1µF for Connection B.

(4) For Connection A. Use 1/4W for Connection B

.

(1)

115V

220V

(2)

(3)

(4)

EXTN

2K

Ω ,1/4W

IN914

TOUCH PLATE

*R

200K

Ω ,1/4W

MPS8599

FIGURE 6.

ELECTRONIC EXTENSION

*R

P

*R = 2M

Ω ,1/4W for 115VAC

*R = 3.6M

Ω ,1/4W for 220VAC

EXTENSIONS:

All switching and dimming functions can be implemented by utilizing the

EXT input. This can be done by either a pushbutton switch or the elec-

tronic switch in conjunction with a Touch Plate, shown in Figure 6.

When the plate is touched, a logic high level is generated at the EXT

input of the IC for both half- cycles of the line frequency. (See Figure 5)

7232ND-012703-4