LS7540 Description
The LS7540 is a CMOS integrated circuit for controlling the brightness of incandescent lamps with momentary touch. When its TOUCH input is connected to a lamp body, the entire lamp turns into a touch plate. A built-in AGC circuit allows for a wide range of lamp sizes to be used, ranging from very small table lamps to very large floor lamps.
LS7540 Key Features
- Touch or pushbutton control of incandescent lamps
- Touch Sensitivity guaranteed to 600pF Touch Plate Capacitance
- Touch Operation independent of line plug polarity
- Minimal external ponents
- AGC Loop stabilizes immediately after Power-Up
- Brightness state is Off after AC power applied
- No change of Brightness state if AC power interrupted < 0.5 sec
- Advanced CMOS design for reliable operating characteristics and low power
- 50/60 Hz Line Frequency
- 5V Operation (VDD
LS7540 Applications
- Screw-in and built-in adapter modules for converting table and floor lamps to touch control for continuous dimming. DESCRIPTION: The LS7540 is a CMOS integrated
- In the off state a single touch will turn the lamp to full_on
- At full-on a single touch will start a dim-cycle causing the brightness to diminish gradually until the lamp turns off
- During a dim-cycle a single touch will stop the dim-cycle and lock in the brightness present at that time. Another touch will restart the dim-cycle from the pre