Figure 3 white LED four common power circuit

 Figure 3 white LED four common power circuit

  LED Bulb

Figure 4 six white LED test the relative accuracy of the regulator

    Figure 3 (a) of the circuit shows how to use a voltage source converter with current limiting resistor to control white LED current, the advantage of this approach is you can choose a variety of voltage regulator, and simply connect one end of the regulator on the white LED; disadvantage  LED Module is brought about by the current limiting resistor power dissipation and white LED forward current is not be accurately controlled, so the efficiency is poor. Figure 4 (a) shows the use of the circuit drives six white LED, six white LED current range of 14.2 ~ 18.4mA, plant products A Plant B about average luminance higher than 2mA.

    Figure 3 (b) shows the circuit realization of the LED current control, wherein the current limiting resistor used to control the matching between the current of each LED. The circuit for the   LED Flexi Strip same batch of LED production plant is matched with high accuracy,