DESCRIPTION:

LS7232ND is a MOS integrated circuit designed to control brightness of incandescent lamps. The output of this IC controls 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 158? 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 a low level at the SENS input or a high level at the EXT input.

FEATURES:

? Phase-lock loop synchronization allows use in Wall Switch applications.

? Provides brightness control of incandescent lamps with touch plates or pushbutton switches.

? Controls the duty cycle from 23 to 88(conduction angles for AC half-cycles between 41? and 158?, respectively.)

? Operates at 50Hz/60Hz line frequency.

? Extension input for remote activation.

? +12V to +18V Power Supply voltage (VSS- VDD).

? LS7232ND (DIP); LS7232ND-S (SOIC ) - See Figure 1

APPLICATIONS:

1. Foot-Switch Dimmer for large floor lamps.

2. Hand-Switch Dimmer for end-table lamps.