One of the regulated power supply circuits with adjustable output voltage

Three-terminal adjustable voltage regulators can be divided into three-terminal adjustable positive integrated voltage regulators and three-terminal adjustable negative integrated voltage regulators, including W117,
W217, W317, LM317, LM337, LLM350, LLM380 and other models. They can be continuously adjusted within the range of 1.2-37V
and can output load currents of 0.1A, 0.sA, 1.5A, 3A, and SA. The voltage regulator chip is equipped with overcurrent
, overheating and regulation tube safe working area protection circuits. It is safe and reliable to use. Its voltage regulation rate and current regulation rate indicators are
better than those of the three-terminal fixed output voltage regulator. When using, as long as two external resistors are connected, the output voltage can be adjusted.
The circuit is shown in Figure 14-56. a. Adjusting the potentiometer RP can change the output voltage. Its output voltage is 1.2~.
The three-terminal adjustable integrated voltage regulator can not only be used as a voltage regulator with adjustable output voltage, but also can be used as a switching voltage regulator, a programmable
output voltage regulator and a precision current source.
    The classification of W××7 series three-terminal adjustable voltage regulators is shown in the table