Menu
Reverse Phase (Trailing-Edge) Light Dimmer For LED Lamps(14-Pins)
LS7641-S, LS7641-TS, LS7641
Category: LED Drivers, Lighting Controls
Status: In Production
Stock Availability: DIP, SOIC, TSSOP, In Stock
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:
• For use in wall switch dimmers driving ceiling lamps.
• Efficient dimming control for both LED and incandescent bulbs.
• Eliminates RFI associated with triac dimmers.
• Continuous analog dimming steps from 0 to 100% brightness.
• Achieves flicker free ultralow brightness for LED bulbs unachievable with triac dimmers.
• Overcurrent sense input for safety shutdown.
• Adjustable turn-on angle for compatibility with light bulbs of different characteristics.
• 50Hz/60Hz operation.
• 5V supply.
• Available in SOIC-14 and TSSOP-14
Description:
LS7641 is a monolithic CMOS lamp dimmer IC designed for in line wall switch applications driving both LED and incandescent lamps. It uses Reverse Phase dimming technology wherein the brightness of a lamp is controlled by controlling the turn-off angle in ac half cycles using a FET. This is in contrast with Leading edge dimming technology wherein the brightness is controlled by varying the turn-on angle using a triac. Reverse Phase dimming produces total flicker free dimming down to extremely low brightness. It also eliminates the following problems associated with triac dimming when driving LED lamps:
• Acoustic and RFI noise.
• Failure of the triac to latch due to load converter oscillation delay
• Flicker at low brightness due to insufficient holding current for the triac
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 mils
-S mils
-SW mils
-TS mils
8
300
150
–
–
14
300
150
–
173
16
300
150
300
173
18
300
300
–
–
20
300
300
–
173
24
600
300
–
173
28
600
300
–
173
38
–
–
–
173
40
600
–
–
–
48
–
–
–
240