LSI/CSI LS7636-S

Since the operating currents of some electronic transformers are below the holding current of most triacs, a typical triac-based (leading-edge) dimmer may not operate properly when driving an electronic transformer-coupled low-voltage halogen lamp. The filtering components in the electronic transformer which prevent its operating frequency from generating line interference can also inhibit triac triggering. The LS7636_LS7637 family of reverse-phase dimmer ICs drive FETs or IGBTs and ‘slowly’ turns on current beginning at the AC input zero-crossing. This ‘slow’ current turn on is ideal for interfacing with the primary of any electronic transformer and also eliminates the RFI generation caused by the sudden turn on of current when using a triac-based dimmer.

• Pushbutton or touch control of high-voltage lamps and all electronic transformer-coupled low-voltage halogen lamps.
• Controls Fluorescents and CFLs via dimming ballasts.
• Reverse-phase technology eliminates RFI generation.
• “FO" versions power up Full On after application of AC.
• Soft turn-on and soft turn-off
• Three operating modes.
• Inputs for direct or remote activation.
• 50Hz/60Hz AC line frequency.
• +12V Power Supply (VDD - VSS).

• Electronic dimmers for wall-switch control of ceiling mounted lighting
• Foot-switch control of large floor lamps
• Handswitch control of table lamps