Driving White LED Circuit

Published:2011/5/18 9:45:00 Author:Joyce | Keyword: Driving White LED | From:SeekIC

CP2128 is a step-up DC/DC converter of low noise and set frequency.If the input voltage isbetween 2.7 to 4.5 V,this device can produce 5v output voltage, and the current output can reach 100MA . Few external components make CP2128 a very suitable choice for small-sized applications in which battery is used as the power source . CP2128 charge pump can reduce fluctuation of output and input when full loaded and zero loaded. With overtemperature protection function, CP2128 can support continuous UOUT grounding. Because it has a high switching frequency， small ceramic capacitors are disposable.(1) the technical characteristics of CP2128The main technical characteristics CP2128 are as follows.①low noise and fixed frequency.②the output current: 100mA.③switching frequency: MHz 1.8.④fixed output voltage: 5 (1± 4%) V.⑤input voltage: 2.7 to 4.5 V.⑥automatic soft start to reduce inrush current.⑦no inductance.⑧when shut off.Icc＜1μA(2) The typical application circuit of CP2128Application areas of CP2128 are: mobile phones, digital cameras, MP3, PDA, notebook computers, GPS receiver. The typical application circuit of CP2128 is as shown in the figure .



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