In this circuit, Vin said power supply input voltage, input voltage range of 2.7 to 5.5 V; Vref is is the internal reference voltage; input "H" signal when the LED begins to glow, enter "L" signal when the LED goes out. In the the RSET end outside the resistor to produce a constant current. At VOUT is the output of the boost circuit, white LED cathode connection. Synchronization with the output of the oscillator circuit due to the converter output voltage VOUT fluctuations in order to curb the volatility of the output voltage, V0UT end parallel output capacitor. The LC41059 the LED1 ~. LED4 connect the negative of the white LED. The LC41059 the of the following three units.
(1) Charge pump booster circuit.
(2) Constant current generating circuit.
(3) Output current controller.
Source: http://www.hqew.net/events/news-article/2228.html
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