AGC Touch Control Light Switch with Soft-Off
(8 Pins)

LS7540-S, LS7540

Category: Lighting Controls

Status: In Production

Stock Availability: DIP, SOIC

All of our Standard Products are RoHS Compliant

For pricing and availability you may contact us, or request a quote. Most of our standard parts are available for purchase on Digi-Key, and through our Distributors.

Features:

• Touch Sensitivity is independent of Touch Plate Size and Line-Plug Polarity
• If Off, a ‘Touch’ produces Max Intensity (On) instantaneously
• If On, a ‘Touch’ initiates intensity ramp-down (Soft-Off). Max intensity to Off ramp-down time is programmable by an external RC. The Soft-Off feature provides light for the User to exit the room. Ramp-down time = 0 if no RC is connected.
• Application of a ‘Touch’ during ramp-down causes the ramp-down to stop. Once stopped, a ‘Touch’ causes the ramp-down to Off to resume. Stopping and starting the ramp-down can be repeated as often as desired thus giving the User full control in setting the light intensity.
• Pushbutton control can be used instead of ‘Touch’.
• Applications include Wall Switches and Touch Control modules for small table lamps to large floor lamps

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.

Ordering Info

Code
Package
Notes

P/N

RoHS Compliant Standard plastic DIP

1, 2, 3

P/N – S

RoHS Compliant Standard SOIC

1, 2, 3, 4

P/N – SW

RoHS Compliant Widebody SOIC option

1, 2, 3, 4

P/N – S14

RoHS Compliant 14-pin SOIC version of 8-pin part

1, 2, 3, 4

P/N – TS

RoHS Compliant TSSOP

1, 2, 3, 4

P/N – TS24

RoHS Compliant 24-pin TSSOP version of 20-pin part

1, 2, 3, 4

Example: LSxxxx-TS = the LSxxxx in the RoHS Compliant TSSOP package-type

Note 1: See Table for package body widths

Note 2: Package outline drawings conform to JEDEC standards

Note 3: Packages shipped in anti-static tubes

Note 4: Tape and Reel option available. Contact factory for details

ADDITIONAL ORDERING OPTIONS:

Probed Wafers (P/N-PW), Waffle Packed Die (P/N-WP)

Package Body Widths
# of Pins
P/N, -C, -CM
-S
-SW
-TS

8

300

150

14

300

150

173

16

300

150

300

18

300

300

20

300

300

173

24

600

300

173

28

600

300

173

38

173

40

600

44

240

LSI/CSI