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Wi-Fi-Enabled Smart Dimmer Switch

Overview

Designed for retrofit smart lighting applications, this two-wire smart dimmer switch operates without a neutral connection, simplifying installation in existing mains-powered LED lighting systems. Direct Wi-Fi® 6 connectivity enables seamless integration with smart home ecosystems, providing intuitive smartphone control, remote access, automation, and cloud-connected services without an additional gateway. An efficient power architecture minimizes standby power consumption, while a compact parallel snubber circuit helps prevent LED flicker and supports reliable dimming. By combining intelligent connectivity, energy-efficient operation, and simplified installation, the design supports the growing demand for secure, connected, and scalable residential and commercial smart home environments.

System Benefits:

  • Simplifies installation with a two-wire design that requires no neutral connection
  • Supports resistive, capacitive, and inductive loads
  • Supports leading-edge and trailing-edge phase-cut dimming
  • Enables direct Wi-Fi 6 connectivity for smart devices and cloud access
  • Optimizes power efficiency with DTIM and TWT support
  • Scales power capability through MOSFET selection
  • Reduces energy loss with a high-efficiency GaN FET-based power architecture

Block Diagram

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WS220-2_SmartDimSwitch_WiFi_0v2Connector LineLine.2798Line.2803Line.2801Line.2605CrystalSheet.2301Sheet.2302Sheet.2303Sheet.2304Sheet.2305Sheet.2306Sheet.2307Line.2308Line.2297Sheet.2298LineLine.2297Crystal.2278Sheet.2279Sheet.2280Sheet.2281Sheet.2282Sheet.2283Sheet.2284Sheet.2285Sheet.2337Line ArrowLine.2415Line.2417Sheet.2422Sheet.2423Sheet.2424Diode LED BlueSheet.2431Sheet.2432Sheet.2433Sheet.2434Darlington.651Sheet.2436Darlington.254Sheet.2438Sheet.2439Diode LED GreenSheet.2441Sheet.2442Sheet.2443Sheet.2444Darlington.651Sheet.2446Darlington.254Sheet.2448Sheet.2449GroundSheet.2451Sheet.2452Connector Line.2453Connector Line.2454Connector 1.160Line.2462AC Power Source.2012Sheet.2480Alternating CurrentLine.2485LLLLine Arrow.2487LinLinLinLine.2503Transistor - NPNSheet.2520Sheet.2521Sheet.2522Sheet.2523Sheet.2524FET n-channel.420Sheet.2526Sheet.2527Sheet.2528Sheet.2529Sheet.2530Sheet.2531VrefVrefVrefSheet.2543Sheet.2544Sheet.2545Sheet.2546Sheet.254732MHz32MHz32MHz40MHz40MHz40MHz3.3V3.3V3.3VLineLine.2575Line.2576Ground.2577Sheet.2578Sheet.2579Resistor - FixedResistor - Fixed.2583Resistor - Fixed.2584Line.2586Resistor - Fixed.2594Connector 1.2604Resistor - Fixed.2606Resistor - Fixed.2620Resistor - Fixed.2621Line.2622Sheet.2626Transistor - NPN.2607Sheet.2608Sheet.2609Sheet.2610Sheet.2611Sheet.2612FET n-channel.420Sheet.2614Sheet.2615Sheet.2616Sheet.2617Sheet.2618Sheet.2619Ground.2623Sheet.2624Sheet.2625Line.2631Line.2649Line.2650Connector 1.160.2654Line.2656Connector 1.160.2657LoutLoutLoutConnector 2Connector 2.2660Line Arrow.2661Line.2662Line.2663Line.2664DiodeSheet.2666Sheet.2667Sheet.2668Diode.2669Sheet.2670Sheet.2671Sheet.2672Connector ArrowLine.2675Connector 1.160.2676Line Arrow.2677Connector Line.2681Connector Line.2683Connector Line.2686Line.2687Connector Line.2688Resistor - Fixed.2689Resistor - Fixed.2690Line.2692Diode - Zener.2693Sheet.2694Sheet.2695Sheet.2696Line.2697Line.2699Connector 1.160.2704Line.2705Line.2709Connector 1.160.2710NNNDiode - Zener.2714Sheet.2715Sheet.2716Sheet.2717Line.2718Capacitor PolaizedSheet.2720Sheet.2721Sheet.2722Sheet.2723Line.2724Line.2725Line.272656V56V56VConnector 1.160.2744Connector 1.160.2745Line.2755Ground.2759Sheet.2760Sheet.2761Line Arrow.27933.3V3.3V3.3VLine Arrow.27953.3V3.3V3.3VLine.2797Connector 1.160.2799Connected signals lineConnector Line.2805WS220-2WS220-2WS220-2Mains(LED-)
LampMains (LED-) LampMains(LED-)LampMainsMainsMainsLine.2813Connector 1.160.2814Immediate voltage stabilizerImmediate Voltage StabilizerImmediate Voltage StabilizerBuck RegulatorBuck RegulatorBuck RegulatorExternal SnubberExternal SnubberExternal SnubberSheet.2817GaN FETGaN FETGaN FETSheet.2342Sheet.2336Sheet.2338Sheet.2339Sheet.2340Sheet.2341Sheet.2343Sheet.2344Sheet.2345Sheet.2346Sheet.2347Connect.2348Sheet.2349Sheet.2350Sheet.2351Line.2484Sheet.2818GaN FETGaN FETGaN FETSheet.2314Sheet.2315Sheet.2316Sheet.2317Sheet.2318Sheet.2319Sheet.2321Sheet.2322Sheet.2323Sheet.2324Sheet.2325Connect.50Sheet.2327Sheet.2328Sheet.2329Sheet.2320Line.2792Sheet.2819Op AmpOp AmpOp AmpOp Amp ComparatorSheet.2555Sheet.2556DriverSheet.2558Sheet.2559Sheet.2560Op Amp Comparator.2561Sheet.2562Sheet.2563DriverSheet.2565Sheet.2566Sheet.2567Ground.2598Sheet.2599Sheet.2600Ground.2601Sheet.2602Sheet.2603Line Arrow.2408Line Arrow.2428Line Arrow.2467Line.2580Line Arrow.2588Line.2627Line.2685Sheet.2820Wireless MCUWireless MCUWireless MCURFRFRFGPIOGPIOGPIOGPIOGPIOGPIOGPIOGPIOGPIOGPIOGPIOGPIOVDDVDDVDDGPIOGPIOGPIOGPIOGPIOGPIO

Wireless MCU

Enables smart lighting control with direct Wi-Fi 6 connectivity, secure remote access, and efficient power management. Built-in wireless security and hardware encryption help protect connected devices while supporting cloud connectivity.
RA Arm Cortex-M MCUs

Op Amp

General-purpose Op Amps

Buck Regulator

Buck Regulators (Integrated FETs)

GaN FET

High-Voltage GaN Power Discretes

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