Buck IC boosts battery voltage for white LED


Posted on Apr 22, 2012

Figure 1 presents an alternative to the typical boost power regulator. A buck-converter IC, IC1, generates the higher voltage that the white-light LED needs. An internal buck power stage connects between VIN and PGND, sourcing current to output Pin L. This circuit operates by turning on the high switch, thereby connecting the battery voltage across inductor L1. Once inductor L1 stores sufficient energy, the high-side switch turns off. The inductor current drives the switching node negative, and energy transfers through the low side into output capacitor C1, creating an essentially lossless switching event. Also, because the high- and low-side switches are MOSFETs, voltage drop is lower than that of a diode implementation; therefore, efficiency can be high.






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