LM337 Voltage Regulator Description

The LM337 is the equivalent counterpart of the LM317 Positive Voltage regulator. The IC commonly used in Adjustable Lab Voltage generators in combination with the LM317 IC. It can also be used as Current Regulators and negative voltage protection circuits, refer the datasheet linked below for application circuits.

The IC has three pins, in which the input voltage is supplied to VIN pin then using a pair of resistors (potential divider) we set a voltage at Adjust pin which will decide the output voltage of the IC that is given out at VOUT pin. Now to make it act as a variable voltage regulator we have to set variable voltages which can be done by using a potentiometer in the potential divider. LM337 datasheet.

Applications

• Used for Positive voltage regulations
• Variable power supply
• Current limiting circuits
• Reverse polarity circuits
• Commonly used in Desktop PC, DVD and other consumer products
• Used in motor control circuits