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LS7541 Datasheet Preview

LS7541 Datasheet

TOUCH CONTROL STEP DIMMER LIGHT SWITCH

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LS7541 pdf
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LS7541
U® L LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
A3800
TOUCH CONTROL STEP DIMMER LIGHT SWITCH May 2006
WITH AUTOMATIC GAIN CONTROL (AGC)
FEATURES:
• Touch Sensitivity guaranteed to 600pF Touch Plate Capacitance.
• Touch Operation independent of line plug polarity.
• Pin selection of three available Brightness Step Sequences.
• Minimal external components.
• AGC Loop stabilizes immediately after Power-Up.
• Brightness state is Off after AC power applied.
• Brightness state is unchanged if AC power interrupted for < 0.5 sec.
• Advanced CMOS design for reliable operating characteristics and low power.
• 50/60 Hz Line Frequency.
• 5V Operation (VDD - VSS).
• LS7541 (DIP); LS7541-S (SOIC) - See Figure 1 -
PIN ASSIGNMENT
TOP VIEW
CLOCK 1
SYNC 2
V DD (+V ) 3
8 TRIG
7 V SS (-V )
6 MODE
APPLICATIONS:
• Screw-in and built-in adapter modules for converting
table and floor lamps to touch control for step dimming.
• On-Off touch control of under-cabinet fluorescent lamps.
TOUCH 4
5 CONTROL
FIGURE 1
DESCRIPTION:
The LS7541 is a CMOS integrated circuit which provides trigger pulses for triac phase control of incandescent lamps.
The circuits are designed to operate with a wide variety of lamp sizes ranging from small table lamps to large floor lamps.
The AGC Loop automatically adjusts Touch Sensitivity to be independent of lamp size.
There are 3 different Brightness Step Sequences for each version of the IC which can be selected by the Three-State
MODE pin as shown in Table 1.
TABLE 1. BRIGHTNESS STEP MODES
MODE PIN
BRIGHTNESS STEP SEQUENCE
FLOAT
OFF-NIGHT LIGHT-MEDIUM-MAXIMUM-OFF
VDD OFF-NIGHT LIGHT- LOW MEDIUM-HIGH MEDIUM-MAXIMUM-OFF
Vss OFF-MAXIMUM-OFF
The lamp brightness is made to vary by changing the delay of the TRIG pulse to the triac from the zero-crossing of the
SYNC input. The delays are shown in Table 2 for 50Hz and 60Hz operation along with Delivered Power as a percentage
of Full Power. Figure 2 illustrates the delay.
TABLE 2. BRIGHTNESS POWER LEVELS
Brightness
Night Light
Low Medium
Medium
High Medium
Maximum
60Hz Delay (1)
6.0 ms
4.8 ms
4.0 ms
3.2 ms
0.85 ms
50Hz Delay (2)
7.2 ms
5.7 ms
4.8 ms
3.8 ms
1.0 ms
% PWR (3)
12
35
53
72
99
(1) With 400kconnected between Pin 1 and VDD.
(2) With 470kconnected between Pin 1 and VDD.
(3) Percentage of Full Power delivered to a resistive load by the Triac Switch.
7541-051106-1



LSI
LSI

LS7541 Datasheet Preview

LS7541 Datasheet

TOUCH CONTROL STEP DIMMER LIGHT SWITCH

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LS7541 pdf
FIGURE 2. OUTPUT DELAY (Td)
SYNC (Pin 2)
TRIG(Pin 8)
Td Td
INPUT/OUTPUT DESCRIPTION:
CLOCK Input (Pin 1)
An external resistor connected between this input and
VDD, along with an internal capacitor and oscillator stage,
generates a clock which is used for all timing functions.
The recommended value of this resistor for 50Hz and
60Hz operation is specified in the ELECTRICAL CHAR-
ACTERISTICS. The resistor value determines the Bright-
ness Levels produced. (See Table 2)
CONTROL I/O (Pin 5)
An external R-C network connected between this pin
and VDD establishes the controlling feedback for the
AGC Loop.
MODE Input (Pin 6)
A three-state input used to select the desired
Brightness Step Sequence (See Table 1).
SYNC Input (Pin 2)
50 or 60Hz AC input for zero crossing detection.
VSS (Pin 7)
Supply voltage negative terminal.
VDD (Pin 3)
Supply voltage positive terminal.
TOUCH Input (Pin 4)
Input for sensing that a touch has been made
on a lamp surface or other touch plate.
TRIG (Pin 8)
The TRIG output produces a negative going pulse eve-
ry half-cycle of the SYNC input to trigger the triac. The
delay, Td, of the pulse with respect to the SYNC signal
determines the Brightness Level produced.
(See Table 2 & Figure 2)
ABSOLUTE MAXIMUM RATINGS:
PARAMETER
DC supply voltage
Any input voltage
Operating temperature
Storage temperature
SYMBOL
VDD - VSS
VIN
TA
TSTG
VALUE
+7
VSS - 0.5 to VDD + 0.5
-20 to +85
-65 to +150
UNIT
V
V
°C
°C
7541-072805-2
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.


Part Number LS7541
Description TOUCH CONTROL STEP DIMMER LIGHT SWITCH
Maker LSI
Total Page 5 Pages
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