LS7232ND Просмотр технического описания (PDF) - LSI Corporation
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LS7232ND Datasheet PDF : 5 Pages
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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.
FIGURE 6. ELECTRONIC EXTENSION
TOUCH PLATE
*R
EXTN
2KΩ ,1/4W
MPS8599
IN914
*R
200K Ω ,1/4W
*R = 2M Ω ,1/4W for 115VAC
*R = 3.6M Ω ,1/4W for 220VAC
P
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)
P
115VAC
OR
C1
220VAC
LOAD
FIGURE 5. A Typical Lamp Dimmer
SEE NOTE 2
G
MT1
MT2
T
R8
+
C5
Z-
C7
R3
SEE NOTE 5
L
D1
87 6
5
C2
TRIG V DD EXT S E N S
LS7232ND
R1
R2
V SS MODE CAP SYNC
1 23
4
A
SEE NOTE 3
B
SEE NOTE 4
C3 C4
R7
C6 R4
P
EXTN
ELECTRONIC
EXTENSION
(FIG. 6)
R6
R5 TOUCH
PLATE
N
N O T E S 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.
C1 = 0.15µF, 200V
(1) C2 = 0.33µF, 200V
C3 = 0.047µF, 25V
C4 = 470pF, 25V
C5 = 47µF, 25V
C6 = 680pF, 25V
C7 = 0.1µF, 25V
(2) R1 = 270Ω, 1W
R2 = 1.5MΩ, 1/4W
R3 = 1.5MΩ, 1/4W
115V
R4 = 1MΩ to 5MΩ, 1/4W
(Select for sensitivity)
R5, R6 = 2.7MΩ, 1/4W
R7 = 150kΩ, 1/4W
R8 = 100Ω, 1/4W
D1 = IN4148
Z = 15V, 1W (Zener)
T = Q4006L4 Triac (Typical)
L = 100µH (RFI Filter)
C1 = 0.15µF, 400V
(3) C2 = 0.22µF, 400V
C3 = 0.047µF, 25V
C4 = 470pF, 25V
C5 = 47µF, 25V
C6 = 680pF, 25V
C7 = 0.1µF, 25V
(4) R1 = 1kΩ, 2W
R2 = 1.5MΩ, 1/4W
R3 = 1.5MΩ, 1/4W
220V
R4 = 1MΩ to 5MΩ, 1/4W
(Select for sensitivity)
R5, R6 = 4.7MΩ, 1/4W
R7 = 150kΩ, 1/4W
R8 = 100Ω, 1/4W
D1 = 1N4148
Z = 15V, 1W (Zener)
T = Q5004L4 Triac (Typical)
L = 200µH (RFI Filter)
(1) For Connection A. Use 0.22µF for Connection B.
(2) For Connection A. Use 1/4W for Connection B.
(3) For Connection A. Use 0.1µF for Connection B.
(4) For Connection A. Use 1/4W for Connection B.
7232ND-012703-4
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