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CMOS dimmer Schematic Circuit Diagram

Semiconductor Revolution: CMOS Technology in Integrated Circuits

Complementary Metal-Oxide Semiconductor (CMOS) stands as the predominant semiconductor technology employed in contemporary integrated circuits, commonly known as chips or microchips. The foundation of CMOS transistors lies in Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) technology. This innovation finds extensive application in the construction of integrated circuits, including microcontrollers, static RAM, registers, microchips, and various digital circuits.

Innovative Dimmer Construction: Siemens’ SLB0586A IC

Siemens’ SLB0586A IC offers a straightforward solution for constructing a touch-controlled dimmer. When coupled with a Type TIC206D triac, it facilitates seamless dimming of light bulbs ranging from 10-400 watts. To suppress switching noise, a 100-pH, 5-A inductor is essential. Synchronizing pulses are generated from the mains voltage, utilizing components R1, C4, and D4. These pulses are then applied to pin 4 of the IC, ensuring smooth operation of the dimming system.

CMOS dimmer Schematic diagram

Voltage Supply and Safety Measures: Ensuring User Protection

To secure the necessary supply voltage, components R2, C2, D1, D2, and C3 are utilized. Maintaining a voltage level approximately 5.3 V lower than the mains voltage. The touch key, serving as the interface for IC operation, is connected to pin 5 through two 4.7 MΩ resistors, R5 and R6. These resistors, carefully integrated, ensure user safety during operation. Given the common integration of dimmers into existing circuits, there is a demand for dual-location operation. Consequently, the diagram incorporates an additional push-button switch, allowing remote operation of the system apart from the touch key.

Flexible Modes and Dimming Functionality: Tailoring IC Operation

The diagram showcases three jump leads, denoted as A, B, and C, designed for selecting among three distinct operating modes of the IC. If jump lead B is utilized, the light remains at the last used brightness level. Alternatively, with A or C in use, the light starts at minimum brightness. When employing jump leads B or C, the dimming direction alters each time the dimming function is activated. A behavior is absent when jump lead A is selected. Briefly touching the touch key (50–400 ms) toggles the light on or off. A more extended touch initiates the dimming cycle, allowing users to precisely control the illumination intensity.


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