a driving circuit for light - emitting diodes includes a power unit providing an input voltage , a voltage regulation unit providing a voltage - increasing loop and a voltage - decreasing loop and having an energy - storing capacitor with an intermediate voltage therebetween , a current control unit generating a driving current for the light - emitting diodes according to the intermediate voltage , and a switching control unit . the switching control unit generates a reference voltage based on the input voltage and compares the reference voltage with a feedback voltage associated with driving current . the switching control unit controls the voltage regulation unit to increase the intermediate voltage through the voltage - increasing loop when the feedback voltage is smaller than the reference voltage . the switching control unit controls the voltage regulation unit to decrease the intermediate voltage through the voltage - decreasing loop when the feedback voltage is larger than the reference voltage .