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LM137 and LM337 adjustable negative voltage regulators

2015-03-18 18:19  
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The LM137 and LM337 are adjustable 3-terminal negative voltage regulators capable of supplying in excess of −1.5A over an output voltage range of −1.2V to −37V.
These LM137 and LM337 regulators are very easy to use in any application and require only 2 external resistors to set the output voltage and 1 output capacitor for frequency compensation.
The LM137 and LM337 circuit design has been optimized for excellent regulation and low thermal transients.
The LM137 LM337 serve a wide variety of applications including local on-card regulation, programmable-output voltage regulation or precision current regulation and are the ideal complements for LM117 LM317 adjustable positive voltage regulators.
Main features of these three terminal voltage regulators are : output voltage adjustable from −1.2V to −37V , 1.5A output current guaranteed , line regulation typically 0.01%/V , load regulation typically 0.3%
Output voltage for this configuration can be calculated using this formula :
lm137 lm33t formula
C1 value is around 100uF electrolytic and C2 value is around 1uF solid tantalum .
Using these voltage regulators we can make a very simple variable regulated power supply .
lm317 lm337 variable power supply circuit lm317 packlm317 to3 pack

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