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參數(shù)資料
| 型號： | LS7540 |
| 廠商： | LSI Corporation |
| 英文描述： | TOUCH CONTROL CONTINUOUS DIMMER with AUTOMATIC GAIN CONTROL (AGC) |
| 中文描述： | 連續(xù)調(diào)光器觸摸式控制，具有自動增益控制（AGC） |
| 文件頁數(shù)： | 4/5頁 |
| 文件大小： | 67K |
| 代理商： | LS7540 |
R1 = 20k
, 1W
R2 = 470k
, 1/4W
R3 = 1k
, 1/4W
)
, 1/4W,1%
R5 = 10M
, 1/4W
R6 = 100
, 1/4W
R7 = See Note 1
C1 = 47μF, 16V
C2 = 1000pF, 16V
C3 = 1000pF, 1kV
R1 = 39k
, 2W
R2 = 910k
, 1/4W
R4 = 420k
, 1/4W, 1%
D1 = 1N4005
T1 = Q4004L4 (Typical Triac)
or Q4004F41 (Typical Triac)
All other values remain the same.
C4 = 1000pF, 1kV
C5 = 0.03μF, 16V (only for Figure 5)
C6 = 1μF, 16V
C7 = See Note 1
Z1 = 5.1V, 1/4W Zener
D1 = 1N4004
D2 = 1N4148
D3 = 1N4148
T1 =
Q2004L4 (Typical Triac)
or Q2004F41 (Typical Triac)
220VAC APPLICATION
115VAC APPLICATION
(
1
) Resistor should be placed adjacent to Pin 1.
(
1
(
1
NOTE 1
: See RAMP input description for determining values for R7 and C7.
NOTE 2
: A good PCB layout using through-hole components will provide protection for ESD introduced at the Touch Plate in the range
of 25kV. Using surface mount components and/or a poor PCB layout can reduce the ESD protection. The OEM can increase
the ESD protection provided by the product with any combination of the following steps:
Step 1
: The most effective and least costly way to increase ESD protection is to create a spark gap around the Touch Plate input on
the PCB. This will increase ESD protection on a good PCB layout to abut 35kV. The gap should be made with a split metal ring
with each side of the metal ring connected back to opposite sides of the AC line. This ensures that a path for the spark back to
house ground through AC Neutral exists independent of line plug polarity. The split ring and the center conduction plate should
be constructed so that the spacing between them conforms to UL requirements. The spark gap will absorb most of the ESD
leaving a remnant of about 10kV for the rest of the circuit to absorb.
Step 2
: Increase R3 from 1k
to 5.1k
and add C8, a 0.1μF capacitor, between V
DD
and Vss.
(A minimal loss in touch sensitivity may be experienced.)
Step 3:
Replace diodes D2 and D3 (1N4148) with Schottky diodes (1N5819 or similar)
7540-060906-4
AC
MAINS
LOAD
R1
R3
R4
D1
FIGURE 5. TOUCH LAMP APPLICATION SCHEMATIC
C3 C4
D2
8
7
6
RAMP
5
CONT
V
SS
CLOCK
SYNC
V
DD
TOUCH
D3
R2
TOUCH
PLATE
(LAMP BODY)
C2
T1
G
MT2
MT1
Z1
C5
R5
C1
+
-
+V
-V
LS7540
C6
-
+
C8*
(SEE NOTE 2)
C7
R6
1
2
3
4
T RIG/
R7
#1
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