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LS7642FO Arkusz danych(PDF) 4 Page - LSI Computer Systems

Numer części LS7642FO
Szczegółowy opis  VOLTAGE CONTROLLED LIGHT DIMMER
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Producent  LSI [LSI Computer Systems]
Strona internetowa  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7642FO Arkusz danych(HTML) 4 Page - LSI Computer Systems

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EXTENSIONS: All On / Off switching functions can be imple-
mented by utilizing the EXT input. Use a pushbutton or the
electronic switch in conjunction with a Touch Plate as 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)
APPLICATION EXAMPLE:
A typical implementation of the light dimmer circuit is shown in Fig. 5.
Here the lamp is turned on and off 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 C4.
• R2 and C3 generate the filtered signal for the SYNC input
AC phase synchronization.
• R3 and C5 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.
• R8 provides current limiting and isolation between the chip
output and the triac gate.
• C1 and L are RFI filter circuits.
• R10, R11, R12 and C7 selects and adjusts the dimming level.
C1 = 0.15µF, 200V
C1 = 0.15µF, 400V
C2 = 0.22µF, 200V
C2 = 0.15µF, 400V
C3 = 0.002µF, 10V
*Component change for 220VAC
**Snubber Network (See Note 5)
C4 = 100µF, 10V
C5 = 0.1µF, 10V
C6 = 0.01uF, 10V
C7 = 0.1uF, 10V
R1 = 270Ω, 1/2W
R1 = 1kΩ, 1W
R2 = 680kΩ, 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
R10 = 33kΩ, 1/4W
R11 = 100kΩ Pot., 1/4W
R12 = 16kΩ, 1/4W
D1 = 1N4148
Z = 5.6V, 1W (Zener)
T = Q4004L4 Typical Triac
(1)
T = Q5003L4 Typical Triac
(1)
L = 100µH (RFI Filter)
L = 200µH (RFI Filter)
(1) For loads greater than 6A,
use an alternistor
*
*
*
*
*
*
*
EXT
10kΩ
IN914
TOUCH PLATE
*R
200kΩ
MPS8599
FIGURE 6. ELECTRONIC EXTENSION
*R
P
*R
= 2MW for 115VAC
*R
= 3.6M W for 220VAC
All Resistors 1/4W
7642-101308-4
FIGURE 4. TRIG/ OUTPUT CONDUCTION ANGLE, Ø
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
ø
TRIG/
SYNC
TW
P
115VAC
OR
220VAC
N
LAMP
C1
T
L
C2
R1
R2
R8
R3
C4
D1
8
7
6
5
R4
C3
TRIG/ VSS EXT SENS/
VDD BCV
SYNC
+
LS7642
R6
R5
FIGURE 5. A Typical Halogen Lamp Dimmer Wall Switch
G
MT2
MT1
Z
-
ELECTRONIC
EXTENSION
(FIG. 7)
EXTN
P
C5
SEE NOTE 3
SEE NOTE 2
R7
NOTES
1. All circuits connected by broken lines are optional.
2. C5 is used only with electronic extension
and
R7 is used only with pushbutton switch.
3. Connection between Pin 6 & Pin 7 should
be broken when EXT is used.
4. Magnetic transformer should have thermal protection.
5. Some electronic transformers may require larger values
of
C2, sensitive gate triacs and snubber networks. C2
values may have to be adjusted to be as high as 0.47uF
for 115VAC and 0.33uF for 220VAC. Sensitive gate triacs
are chosen for their low holding current. Typical triacs are
L4004L6 and L4004F51 for 115VAC and L6004L6 and
L6004F51 for 220VAC applications, respectively.
**C6-R9 is the snubber network:
C6 = 0.1uF, 200V, R9 = 1k Ohm, 1/2W (115VAC);
C6 = 0.05uF, 400V, R9 = 1k Ohm, 1W (220VAC)
6. The values selected for R10, R11, and R12 will produce the
full dimming range. To reduce the maximum intensity,
increase the value of R12. To increase the minimum
intensity, increase the value of R10. Increasing either R10
or R12 will reduce the dimming range. R10 may have to be
increased for very low wattage loads.
TOUCH
PLATE
SEE
NOTE 4
TEST
1
2
3
4
**R9
**C6
C7
R10
R11
R12


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