60WLEDBULBGEVB: Dimmable, 9.5 W, 120 Vac CCR Lighting Circuit Evaluation Board

The 60WLEDBULBGEVB Evaulation Board 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 and THD performance, dimmability, low cost, and efficiency.

This circuit uses a parallel-to-series topology that dynamically adjusts LED load voltage as the instantaneous bridge output voltage varies. While a switch-mode power supply such as 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 instantaneously 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 efficiency, PF, and THD performance.

Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
Dimmable, 9.5 W, 120 Vac CCR Lighting Circuit Evaluation Board BAS21HT1G MMBT3904LT1G
Technical Documents
Type Document Title Document ID/Size Rev
Eval Board: BOM 60WLEDBULBGEVB Bill of Materials ROHS Compliant 60WLEDBULBGEVB_BOM_ROHS.pdf - 49 KB  0 
Eval Board: Gerber 60WLEDBULBGEVB Gerber Layout Files (Zip Format) 60WLEDBULBGEVB_GERBERS.zip - 553 KB  0 
Eval Board: Schematic 60WLEDBULBGEVB Schematic 60WLEDBULBGEVB_SCHEMATIC.pdf - 69 KB  0 
Eval Board: Test Procedure 60WLEDBULBGEVB Test Procedure 60WLEDBULBGEVB_TEST_PROCEDURE.pdf - 43 KB  0 
Video 60W Equivalent LED Design Demonstration - 60WLEDBULBGEVB WVD17603/D   
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60W Equivalent LED Design Demonstration - 60WLEDBULBGEVB
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