The schematic here shows a negative adjustable power supply circuit using LM337 IC. LM337 Negative Voltage Adjustable Power Supply Circuit: Replacement and Equivalent / Other Part Numbers To get stable output voltage from this IC the input voltage must be 2V to 3V high than the output voltage. The IC can be used in variety of power supply and battery charger applications. There are many online calculators available which can be used to calculate the resistor value of desired output voltage. This IC can also be used as a fixed output negative voltage regulator for doing so just use a fixed value resistor according to the output voltage in the place of variable resistor. A variable resistor can also be used in the resistor divider network to easily adjust the output voltage on desired level. LM337 can be used as an adjustable regulator or a fixed regulator depends on the requirement of the user, the output can be adjusted with the help of a resistor divider network that is connected with the adjustment pin of the IC. The IC will dissipate heat during operation because all the voltage difference will convert to heat and a suitable heat sink is must to use with the IC. which makes the IC damage proof in many situations. LM337 have many built in features like overheat shutdown, overcurrent shutdown, short circuit protection etc.
The IC is capable to deliver output current of upto 1.5A that is quite enough to drive variety of electronic applications the output current can also be adjusted on desired level according to the user requirements. Its input voltage is from -3V DC to 40V DC and the good feature is that the output can be adjusted from -1.2V to -37V.
LM337 is a negative voltage regulator IC which is complementary to LM317 positive voltage regulator as the LM317 is a quite popular IC among electronics engineers, students and tinkerers.
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