Driving circuit diagram of a low-power LED bulb

A general LED driver requires two LED current feedback and sometimes even uses a photocoupler to transmit the signal through an insulator to provide accurate and continuous current. For low-power LED bulbs, there is not enough space to add so many devices. . In order to solve these problems, this article introduces a low-power LED light bulb drive circuit. As shown in the figure below, this circuit uses STMicro's HVLED805. The LED driving power is less than 5W and the accuracy is +-5%. One device can solve the above problems and maintain stable output current CC and output voltage CV while also maintaining stable output current CC and output voltage CV. It has over-voltage protection to ensure the safety of the bulb.