Cxsu63240b is a boost DC / DC converter with wide input voltage range (0.8 ~ 5.5V), adjustable constant current and limited current to drive white LED. The frequency conversion mode is adopted to limit the current period by period, so that the input and output current changes uniformly with the decrease of power supply voltage. The device can use single or double dry cells to drive single high-power white LED, and can also use a lithium battery to drive two, three or more WLED ed's. The method of driving WLED series connection can provide equal WLED current, thus obtaining uniform brightness.
The 46 MV low feedback voltage reduces the power consumption of the current regulation resistor to the maximum extent and improves the efficiency. The current limit feedback voltage of 50mV can be set according to different requirements.
Cxsu63240b is different from cxsu63240 in current limiting mode. With the decrease of input voltage, the input and output current of cxsu63240 will suddenly change at a certain point. The frequency conversion mode is adopted in cxsu63240b to avoid this phenomenon. Other functions remain unchanged.