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.