Reverse phase dimmer ICs
11 July 2012
Opto-Electronics
LSI/CSI announced the addition of four new reverse phase (trailing edge) dimmers – the LS7636, LS7636FO, LS7637 and LS7637FO – to its line of lighting control ICs.
Dimmers made with these new ICs eliminate the RFI generated by triac-based light dimmers that can interfere with nearby electronics such as an AM radio. A reverse phase dimmer IC turns on the drive transistors at the zero-crossover point of each half cycle, enabling a slow current rise. Current is terminated later during the half-cycle depending on the desired dimming level.
RFI generation is minimised since power to the load is not turned on abruptly as with leading edge (triac-based) dimmers, eliminating the need for external filtering. Another important characteristic is that these dimmer ICs can drive any electronic transformer.
The LS7636 ICs automatically reverse direction when reaching maximum or minimum intensity, while the LS7637 ICs stop dimming when reaching maximum or minimum intensity. The FO versions power up to full–on intensity when AC power is first applied.
Each device has three selectable operating modes. These modes allow the load to be turned on to maximum intensity or to a previous set memory level in response to a short pushbutton application, and to continue dimming in the same direction or reverse with each new long pushbutton application.
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