Bluetooth speaker DC-DC booster chip dynamic boost compared to the advantages of constant boost is: the whole machine work efficiency is higher, small and medium volume lithium battery life is longer, the application principle diagram is as follows:

Principle description:
     The four-gear dynamic boost is achieved through two MOS tubes Q1,Q2 and two resistors RD2, and RD3 changes the boost output value of the booster chip FB pin (similarly, if two gears dynamic boost is required, it can be achieved through one MOS tube Q1 and one resistor RD2).
    The Bluetooth main control IC detects the size of the audio signal and controls the turn-on and turn-off of the two MOS tubes in real time through the two IO ports (whether the resistance is connected by bypass or not). The four combined states obtain the corresponding four FB pin partial pressure values, and finally obtain the corresponding four boost output values.
    The DC-DC boost value dynamically switches with the size of the audio signal. The boost value is high when the audio signal is large, and the boost value is low when the audio signal is small. Compared with the passive dynamic boost detection at the audio amplifier end, this method is controlled by the main control chip with shorter time delay and less switching instantaneous distortion.