LED Down lights

  S8813 with LM2794 structures are similar, but the principle is a constant pulse frequency  LED Lighting china modulation. This constant current conversion efficiency for some benefits, but there are some switching noise. The device's typical operating frequency is about 600kHz, with three current outputs, each of 5 ~ 18mA.

(3) Switching Power Supply

Ceiling Light

    As the energy storage element is a capacitor charge pump, but as a boost switching power white LED driver applications are more widely. In fact, as the energy storage element inductor inductor boost switching converter, the voltage increased performance is superior to the charge pump Converter. For white LED driver inductor boost switching converter mostly current output type.

    Currently, low-power integrated inductor boost switching converter as a power switch with a multi-chip N-channel MOSFET, but still need an external inductor usually. MAX1848 switching  LED Down lights frequency of 1.2MHz, to 2.6 ~ 5.5V supply voltage, the maximum output voltage up to 13V, enough to drive 2 to 3 series white LED. MAX1848 can drive both three-way parallel load, each load consists of two series-connected white LED. This application requires equipped with three sampling resistor, and the brightest of the load current match situation is not satisfactory.