LS7635 查看數據表（PDF） - LSI Corporation
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LS7635 Datasheet PDF : 4 Pages
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SENS
FIGURE 4. LS7635 TRIG, Ø vs TOUCH (SENS OR EXT)
TS1
TS2
SHORT SHORT
LONG
LONG
LONG
LONG
SHORT LONG
SHORT
150º
Ø 100º
MODE Ø 50º
OFF
150º
Ø 100º
MODE 1 50º
OFF
342ms
A2
B2
SLOPE = SS
A0 A0
SLOPE = SAA
A1 B1 B2 A2
SLOPE = SBA
A1 B1 B2
A2
REVERSE
A1
B1
A2
B2
A2
B2
MEMORY
MEMORY
150º
Ø 100º
MODE 2 50º
OFF
B2 A2
REVERSE
A0 A0
A0
A0
A2
B2
FIGURE 5. A Typical Halogen Lamp Dimmer Wall Switch
P
P
SEE NOTE 2
**C6
G
R8
C5
R7
EXTN
ELECTRONIC
EXTENSION
**R9
MT1
T
MT2
+
C4
Z
-
R3
SEE NOTE 3
R5
TOUCH
PLATE
(FIG. 7)
NOTES
R6 1. All circuits connected by broken lines are optional.
115VAC
OR
C1
220VAC
D1
L
C2
87
6
5
TRIG V SS EXT SENS
2. C5 is used only with electronic extension
and R7 is used only with mechanical switch.
3. Connection between Pin 6 & Pin 7 should
be broken when EXT is used.
LS7634 / LS7635
R1
4. Magnetic transformer should have thermal protection.
5. Some electronic transformers may require larger
V DD MODE TEST SYNC
values of C2, sensitive gate triacs and snubber
R2
12
34
networks. C2 values may have to be adjusted to be as
high as 0.47uF for 115VAC and 0.33uF for 220VAC.
R4
The sensitive gate triacs are chosen for their low
SEE
NOTE 4
LAMP
C3
holding current. Typical triacs are L4004L6 and L6004L6
for 115VAC and 220VAC applications, respectively.
**C6-R9 is the snubber network: C6 = 0.1uF, 200V,
N
R9 = 1k Ohm, 1/2W (115VAC); C6 = 0.05uF, 400V,
R9 = 1k Ohm, 1W (220VAC)
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
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
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
FIGURE 6. ELECTRONIC EXTENSION
.
APPLICATION EXAMPLE:
EXT
10k Ω
MPS8599
IN914 *R
*R
A typical implementation of the light dimmer circuit is shown in Fig. 5.
Here the brightness of the lamp is set by touching the touch plate.
The function of different components are as follows:
TOUCH PLATE
200kΩ
*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 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)
7634/7635-090606-4
• 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.
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