The RT9107B is a voltage regulator chip with 3 pins. Among them, pin 1 is the power supply pin, connected to the positive power supply, usually the voltage range is 2.5V to 5.5V; Pin 2 is the ground pin, connected to the negative power supply, the voltage is 0V; Pin 3 is the output pin that provides a stable output voltage, which is determined by an external resistance divider and can usually be adjusted from 0.8V to 5.0V.
Among them, pin 3 is the more important output pin, which can obtain the required output voltage value through the external connection resistance, and the other two feet are the power supply and the ground foot.
It's a digital power amplifier. Yes, power supply 8 -- 26V output power double 6 -- 15W. Generally used for LCD TV