The chip regulator ht7130 has three pins, namely input voltage pin Vin, output voltage pin Vout and ground pin GND.
The input voltage pin Vin is connected to the input power supply, the output voltage pin Vout is connected to the load, and the ground pin GND is connected to the ground wire. The three pins together form the circuit of the patch regulator ht7130.
It should be noted that the voltage of the input voltage pin Vin must be higher than the voltage of the output voltage pin Vout, otherwise the chip regulator ht7130 will not work properly.
The chip regulator ht7130 three-terminal IC refers to this integrated circuit for voltage regulation, with only three pin outputs, which are input, ground and output. It looks like an ordinary triode, the standard package of the TO-220, and there is also a 9013-like TO-92 package.