LS7540中文資料LSI數(shù)據(jù)手冊PDF規(guī)格書

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. The brightness is controlled by controlling the conduction angle of a triac in series with the lamp and triggered by the TRIG/ output. Between off and maximum, there are 124 steps of brightness levels, level zero being off and level 124 being maximum. The phase reference of the Trig/ signal with respect to the AC line is maintained through the SYNC input.

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 components.

? 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 - VSS).

? LS7540 (DIP); LS7540-S (SOIC) - See Figure 1-

APPLICATIONS:

? Screw-in and built-in adapter modules for converting table and floor lamps to touch control for continuous dimming.