基于NCL30000設計的中小型開關電源
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圖4 寬輸入4-15 個LED 350mA應用電路圖
This is a single stage power factor corrected TRIAC dimmable isolated flyback LED driver intended for lighting applications such as down lights, PAR lamps and residential/commercial LED fixtures. The NCL30000 is based on a fixed on-time, critical conduction mode (CrM) flyback topology. The board is designed to provide 350 mA of constant current and drive up to 15 W of LEDs in a single string. Closed loop regulation of the LED current is achieved which results in accurate current regulation across a range of LEDs. This board is specifically designed to support an input line voltage range of 180-265 Vac.
The design is power factor corrected with a nominal PF of >0.96. Triac dimming is preconfigured to drive 12 white LEDs at 350 mA from 230 Vac. For optimal dimming performance, a single capacitor can be adjusted to match other numbers of LEDs. The board can support from 4-15 LEDs in series.
圖5。NCL30000LED2GEVB評估板外形圖
圖6。NCL30000LED2GEVB評估板電路圖
NCL30000LED2GEVB評估板材料清單（BOM）：
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