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
TRIG VDD EXT SENS
VSS MODE CAP SYNC
+
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
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
(Pin 6) should be tied to VDD (Pin 7).
• 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 = 1MΩ to 5MΩ, 1/4W
C2 = 0.33µF, 200V (Select for sensitivity)
C3 = 0.047µF, 25V R5, R6 = 2.7MΩ, 1/4W
C4 = 470pF, 25V R7 = 150kΩ, 1/4W
C5 = 47µF, 25V R8 = 100Ω, 1/4W
C6 = 680pF, 25V D1 = IN4148
C7 = 0.1µF, 25V Z = 15V, 1W (Zener)
R1 = 270Ω, 1W T = Q4006L4 Triac (Typical)
R2 = 1.5MΩ, 1/4W L = 100µH (RFI Filter)
R3 = 1.5MΩ, 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 = 1MΩ to 5MΩ, 1/4W
C2 = 0.22µF, 400V (Select for sensitivity)
C3 = 0.047µF, 25V R5, R6 = 4.7MΩ, 1/4W
C4 = 470pF, 25V R7 = 150kΩ, 1/4W
C5 = 47µF, 25V R8 = 100Ω, 1/4W
C6 = 680pF, 25V D1 = 1N4148
C7 = 0.1µF, 25V Z = 15V, 1W (Zener)
R1 = 1kΩ, 2W T = Q5004L4 Triac (Typical)
R2 = 1.5MΩ, 1/4W L = 200µH (RFI Filter)
R3 = 1.5MΩ, 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
2KΩ,1/4W IN914
TOUCH PLATE
*R
200KΩ,1/4W
MPS8599
FIGURE 6. ELECTRONIC EXTENSION
*R
P
*R = 2MΩ,1/4W for 115VAC
*R = 3.6MΩ,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