器件名称: LS7538
功能描述: TOUCH CONTROL STEP DIMMER LIGHT SWITCH WITH AUTOMATIC GAIN CONTROL (AGC)
文件大小: 26.56KB 共4页
简 介:LSI/CSI
UL
LS7538-LS7539
(631) 271-0400 FAX (631) 271-0405
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
A3800
TOUCH CONTROL STEP DIMMER LIGHT SWITCH WITH AUTOMATIC GAIN CONTROL (AGC) December 2002
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. +6V to +9.5V Operation (VDD-VSS). LS7538, LS7539 (DIP); LS7538-S, LS7539-S (SOIC) - See Figure 1 PIN ASSIGNMENT TOP VIEW
CLOCK 1
2
8
TRIG
LSI
LS7538/7539
SYNC
7
V SS (-V)
V DD(+V )
3
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 (LS7539 only).
TOUCH
4
5
CONTROL
FIGURE 1
DESCRIPTION:
The LS7538 and LS7539 are CMOS integrated circuits which provide 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. Th……
