40WLEDBULBGEVB: Dimmable 120 Vac, 6.5 W Input Parallel-to-Series Lighting Circuit Evaluation Board

The 40WLEDBULBGEVB showcases an enhanced parallel-to-series LED lighting circuit. It uses updated control circuitry that allows the ability to accommodate multiple LED voltages by simply adjusting a single resistor (R3) as well as compensating for drift in LED voltage with temperature. It also has superb PF, THD performance, dimmability, and efficiency at a low cost.

ON Semiconductor’s parallel-to-series topology dynamically adjusts LED load voltage as the instantaneous bridge output voltage varies. While a switch-mode power supply (a buck converter) reconfigures the input voltage to match the load, this circuit reconfigures the load to match the input voltage. When the instantaneous input voltage is relatively low, the LEDs are configured in parallel. When the instantaneous input voltage is relatively high, the LEDs are configured in series.

The circuit is designed for input voltages between 100 Vac and 140 Vac. ON Semiconductor CCRs are used to provide constant LED current and to protect LEDs from over-voltage conditions. The circuit employs an additional CCR (shown as CCR2) to increase LED current at high voltages for improved PF and THD performance.

Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
40WLEDBULBGEVB Active
Pb-free
Dimmable 120 Vac, 6.5 W Input Parallel-to-Series Lighting Circuit Evaluation Board NSIC2020JBT3G NSIC2030JBT3G
Technical Documents
Type Document Title Document ID/Size Rev
Design Notes Dimmable 120 Vac, 6.5 W Input Parallel-to-Series Lighting Circuit DN05084/D - 513 KB  1 
Eval Board: BOM 40WLEDBULBGEVB Bill of Materials ROHS Compliant 40WLEDBULBGEVB_BOM_ROHS.pdf - 34 KB  0 
Eval Board: Gerber 40WLEDBULBGEVB Gerber Layout Files (Zip Format) 40WLEDBULBGEVB_GERBER.zip - 39 KB  0 
Eval Board: Schematic 40WLEDBULBGEVB Schematic 40WLEDBULBGEVB_SCHEMATIC.pdf - 47 KB  0 
Eval Board: Test Procedure 40WLEDBULBGEVB Test Procedure 40WLEDBULBGEVB_TEST_PROCEDURE.pdf - 34 KB  0 
Video 40W Equivalent LED Design Demonstration - 40WLEDBULBGEVB WVD17602/D   
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40W Equivalent LED Design Demonstration - 40WLEDBULBGEVB
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