FIGURE 2. TRIG/ OUTPUT CONDUCTION ANGLE, Ø
SYNC
ø
TRIG/
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.
T
W
TOUCH
Ts
180º
MAX
DIM CYCLE
MAX
DIM CYCLE
DIM CYCLE
Ø
120º
60º
0°
T
T
MIN
OFF
OFF
FIGURE 3. TOUCH vs TRIG/ CONDUCTION ANGLE, Ø
CLOCK
1
CLOCK
GENERATOR
SYNC
2
ZERO CROSS
DETECT
TOUCH
4
AGC
TOUCH CONTROL
5
CONTROL
RAMP
6
BRIGHTNESS
CONTROL
TRIGGER
GENERATOR
8
TRIG/
V
DD
V
SS
3
7
V+
GND
FIGURE 4. LS7540 BLOCK DIAGRAM
7540-121605-3