Description

The LS7642 is an innovative light dimmer allowing direct control of illumination with analog voltage. The analog voltage applied at the brightness control input directly controls the conduction angle of a triac in series with the lamp. For manual dimming applications such as wall switches, floor and table lamps etc, a sliding or rotary potentiometer with a center tap can serve as the controlling element. For automated applications such as uC controlled illumination, dawn, dusk and daylight emulation in chicken coops etc., the control voltage can be provided by the uC with built-in or external D/A converter creating accurate control of dimming patterns. Turn-on and turn-off of the lamp is made with a touch or push-button or uC signal applied at the SENSE/ input or the EXT input. In both turn-on and turn-off events, the brightness is softly ramped up and ramped down, respectively.

Features:

• Touch or push button input control for soft turn-on and turn-off.
• Analog voltage input directly controls lamp intensity.
• Interfaces easily with a uC for programmable lighting control.
• Controls high-voltage lamps and *transformer-coupled low-voltage halogen lamps. *Magnetic transformers and virtually all electronic transformers.
• Automatic safety shutdown.
• Controls Fluorescents and CFLs via dimming ballasts.
• “FO” versions power up at the intensity set by the analog voltage.