LS7534

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


Pinout




Specifications

RATING	SYMBOL	VALUE	UNIT
DC Supply Voltage	VSS - VDD	+20	V
Any input voltage	VIN	VSS - 20 toVSS + 0.5	V
Operating temperature	TA	0 to +80
Storage temperature	TSTG	-65 to +150

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 positioning of the output is controlled by applying the proper logic levels at the UP and DOWN inputs.

·These functions may be implemented with very few interface components which is described in the application examples (See Fig. 5A and 5B). For touch plates, LS7534 is used (Fig. 5A). For mechanical switches, LS7535 is used (Fig. 5B).