LS7535

UL ® LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 LSI LS7534 LS7535 (631) 271-0400 FAX (631) 271-0405 A3800 DIMMER LIGHT SWITCH WITH UP AND DOWN CONTROLS FEATURES: Phase-lock loop synchronization allows use as a Wall Switch Brightness control of incandescent lamps with touch plates (LS7534) or mechanical switches (LS7535) Dual Controls eliminate confusion Soft turn-on /turn-off Controls the "Duty Cycle" from 23% to 88% (conduction angles for AC half-cycles between 41° and 159°, respectively) Operates at 50Hz/60Hz line frequency Input for slow dimming +12V to +18V DC supply voltage (VSS - VDD) LS7534/LS7535 (DIP); LS7534-S/LS7535-S SOIC - See Figure 1 August 1996 CONNECTION DIAGRAM - TOP VIEW V SS (+V) 1 8 TRIG DOZE 2 7 V DD (-V ) LS7534 CAP 3 6 DOWN SYNC 4 5 UP FIGURE 1 DESCRIPTION: LS7534/LS7535 are monolithic, MOS integrated circuits that are designed for brightness control of incandescent lamps. The outputs of these ICs control the brightness of a lamp by controlling the firing angle of a triac connected in series with the lamp. All internal timings are synchronized with the line frequency by means of a built-in phase-lock loop circuit. The output occurs once every half-cycle of the line frequency. Within the half-cycle, the output can be positioned anywhere between 159° conduction angle for maximum brightness and 41° conduction angle for minimum brightness in relation to the AC line frequency. The...