Inductive Based Switching Regulator Schematic

White LEDs are quickly becoming the light of choice for backlighting of small color displays because of their falling costs, longer life, and smaller size. The problem this presents is that the white LED has a high voltage drop (3.1V to 4.0V depending on manufacturer) as compared to the monochrome displays’ green LED with a voltage drop of 1.8V to 2.7V. Whereas the green LED can be powered directly from the commonly used Li-Ion battery, with a linear regulator, and a ballast resistor, the white LED used for backlight or frontlight purposes will requires the battery voltage be boosted. National has many solutions for driving LEDs including switched capacitor converters and inductive based switching regulators. This application note will describe some methods of driving white LEDs using inductive based switching regulators and some of the benefits of each. The main areas of concern for most designers of portable equipment are efficiency, size, cost, functionality, and LED current matching. Balancing these competing demands will help designers make the right choice for his or her application.– Article quote

Inductive Based Switching Regulator Schematic
The topics discussed inside the application note including the introduction, the switching regulator, life support policy, and many more.

Source : Clinton Jensen (National Semiconductor Application Notes)

Find more details about the Inductive Based Switching Regulator from the National Semiconductor by downloading the pdf document from the following source ( :

Inductive Based Switching Regulator Circuits Provide High Efficiency White LED Drives DOWNLOAD

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