FIGURE 4. LS7632 TRIG, Ø vs TOUCH (SENS OR EXT)
T
S1
SENS
SHORT
SHORT
LONG
LONG
LONG
LONG
SHORT
LONG
SHORT
T
S2
Ø
MODE Ø
150º
100º
50º
OFF
SLOPE = S
S
342ms
A0
A2
SLOPE = S
AA
A0
SLOPE = S
BA
A1
B1
B2
A2
A2
MEMORY
MEMORY
Ø
MODE 1
150º
100º
50º
OFF
A1
B1 B2
A2
REVERSE
A1
A2
B1
B2
REVERSE
150º
100º
50º
OFF
A2
A0
A0
A0
A0
Ø
MODE 2
A2
FIGURE 6. A Typical Halogen Lamp Dimmer Wall Switch
P
G
MT1
MT2
P
SEE NOTE 2
R8
C6
R3
ELECTRONIC
EXTENSION
(FIG. 7)
R6
8
C2
R1
R2
1
7
6
5
TRIG V
SS
EXT S E N S
LS7631/LS7632
V
DD
MODE
2
CAP SYNC
3
C3
SEE
NOTE 4
LAMP
4
C4
R4
R5
R7
EXTN
T
Z
+
C5
-
SEE NOTE 3
L
C1
D1
115VAC
OR
220VAC
TOUCH
PLATE
NOTES
1.
All circuits connected by broken lines are optional.
2.
C6 is used only with electronic extension
and R7 is used only with a pushbutton.
3.
Connection between Pin 6 & Pin 7 should
be broken when EXT is used.
4.
As a precaution, transformer should have
thermal protection.
Z = 5.6V, 1W (Zener)
T = Q4004L4 Typical Triac
(1)
*
T = Q5003L4 Typical Triac
(1)
L = 100µH (RFI Filter)
200µH (RFI Filter)
*
L = For loads greater than 6A,
(1)
use an alternistor
N
C1 = 0.15µF, 200V
*
C1 = 0.15µF, 400V
C2 = 0.15µF, 200V
*
C2 = 0.082µF, 400V
C3 = 0.02µF, 10V
C4 = 0.002µF, 10V
*
= component change for 220VAC
FIGURE 7.
EXT
10kΩ
MPS8599
C5 = 100µF, 10V
C6 = 0.1µF, 10V
R1 = 270Ω, 1/2W
*
R1 = 1kΩ, 1W
R2 = 680Ω, 1/4W
*
R2 = 1.5MΩ, 1/4W
R3 = 1.5MΩ, 1/4W
R4 = 1MΩ to 5MΩ, 1/4W
(Select for Sensitivity)
R5, R6 = 2.7MΩ, 1/4W
*
R5, R6 = 4.7MΩ, 1/4W
R7 = 150kΩ, 1/4W
R8 = 62Ω, 1/4W
D1 = 1N4148
.
APPLICATION EXAMPLE:
A typical implementation of the light dimmer circuit is shown in Fig. 6.
Here the brightness of the lamp is set by touching the touch plate.
The function of different components are as follows:
• The 5V 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 C6 act as a filter circuit for the electronic extension.
If extensions are not used, the EXT input (Pin 6) should be
tied to Vss (Pin 7).
• R4, R5 and R6 set up the sensitivity of the SENS input.
• 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 RFI filter circuits.
ELECTRONIC EXTENSION
IN914
*R
*R
TOUCH PLATE
200k
Ω
*R
= 2M
Ω
for 115VAC
*R
= 3.6M
Ω
for 220VAC
All Resistors 1/4W
P
EXTENSIONS:
All switching and dimming functions can be
implemented by utilizing the EXT input. Use a pushbutton or
the electronic switch in conjunction with a Touch Plate as
shown in Figure 7. 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 6)
7631/32-112102-4
LSI [ LSI COMPUTER SYSTEMS ]
