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LS7237 Datasheet(PDF) 4 Page - LSI Computer Systems

Part No. LS7237
Description  TOUCH CONTROL LAMP STEP DIMMER
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Maker  LSI [LSI Computer Systems]
Homepage  http://www.lsicsi.com
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LS7237 Datasheet(HTML) 4 Page - LSI Computer Systems

   
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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, Modes 1 and 2. Use 1/4W for Mode 0
and Connection B, all Modes.
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, Modes 1 and 2. Use 1/4W for Mode 0
and Connection B, all Modes.
NOTES:
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 3
LS7237
R6
R5
FIGURE 5. A Typical Lamp Dimmer
G
Z
-
ELECTRONIC
EXTENSION
(FIG. 6)
EXTN
P
C7
SEE NOTE 4
SEE NOTE 2
R7
C6
TOUCH
PLATE
MT2
MT1
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) Use Connection A when Neutral is not available. Use Connection B when Neutral is available.
4) Connection between Pin 6 and Pin 7 should be broken when EXT is used.
(1)
115V
220V
7237-041597-4
APPLICATION EXAMPLES:
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, C5.
• R2 and C4 generate the filtered signal for the SYNC input for syn-
chronizing the internal PLL with the line frequency.
• R3 and C7 act as filter circuit for the electronic extension. If exten-
sions 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 un-
changed for a period up to 1 sec. For longer power interruptions, the
output is shut off.
EXTENSIONS:
All switching and dimming functions can also be implemented by
utilizing the EXT input. This can be done by either a mechanical
switch or the electronic switch in conjunction with a Touch Plate
as shown in Figure 6. When the plate is touched, a logic high lev-
el is generated at the EXT input of the IC for both half-cycles of
the line frequency. (See Figure 5)
EXTN
2K
Ω ,1/4W
IN914
TOUCH PLATE
*R
200K
Ω ,1/4W
MPS8599
FIGURE 6. ELECTRONIC EXTENSION
P
*R
*R
= 2MΩ, 1/4W for 115VAC
*R
= 3.6MΩ, 1/4W for 220VAC
(2)
(3)
(4)


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