Not only limited input

 Not only limited input voltage range of the drive technology and inefficient. When the the  LED Downlights ordinary LED driver for low power, since only a few mA of current, and therefore no significant loss, when used as the drive current of hundreds of mA or more bright LED, power losses in the circuit it would compare serious problem. The switching power supply is currently the highest efficiency in energy conversion, more than 90% can be achieved. Buek, Boost and  LED Strip Lights Buck-Boost and other power converter can be used for LED driver, just to satisfy the constant current LED driver senses the output current rather than detecting the output voltage feedback control.

     The Buck converter LED driver circuit with traditional Buek converter type, the switch tube S is moved to the inductance L of the rear, the S source grounded, so as to facilitate the S driver, LED L series, and the freewheeling diode D anti-parallel with the series circuit, the driver circuit is not only simple and does not require an output filter capacitor and reduce the cost. However, Buck  GU10 LED Lamp converter buck converter does not apply to low input voltage or multiple LED series of occasions.