FIGURE 8. A SWITCH-OPERATED LAMP DIMMER
AC ON-OFF SWITCH
G
MT1
R3
+
T1
MT2
C5
Z1
D1
L
-
PUSHBUTTON
SWITCH
115VAC
OR
(SEE NOTE
)
220VAC
C1
C2
8
7
6
5
TRIG V
DD
EXT S E N S
R1
R2
LS7231-4
V
SS
D O Z E CAP SYNC
1
2
3
4
C3
OUT
TO
LAMP
C4
R4
NOTE:
Operation is independent of Line Plug Polarity
115V
C1 = 0.15µF, 200V
C2 = 0.22µF, 200V
C3 = 0.047µF, 25V
C4 = 470pF, 25V
C5 = 47µF, 25V
R1 = 270Ω, 1/4W
R2 = 1.5MΩ, 1/4W
R3 = 100Ω, 1/4W
R4 = 1MΩ, 1/4W
D1 = IN4148
Z1 = 15V, 1W (Zener)
T1 = Q4008L4 (Typical)
L = 100µH (RFI Filter)
220V
C1 = 0.15µF, 400V
C2 = 0.1µF, 400V
C3 = 0.047µF, 25V
C4 = 470pF, 25V
C5 = 47µF, 25V
R1 = 1KΩ, 1/4W
R2 = 1.5MΩ, 1/4W
R3 = 100Ω, 1/4W
R4 = 1MΩ, 1/4W
D1 = IN4148
Z1 = 15V, 1W (Zener)
T1 = Q5004L4 (Typical)
L = 200µH (RFI Filter)
APPLICATIONS:
1. Foot-Switch Dimmer for large floor lamps.
2. Hand-Switch Dimmer for end-table lamps.
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.
7231-4-032995-8
LSI [ LSI COMPUTER SYSTEMS ]
