Lm337 adjustable voltage regulator circuit diagram
The LM117/LM317 has an output voltage range of 1.2V to 37V and a maximum load current of 1.5A. It is very simple to use and requires only two external resistors to set the output voltage. In addition, its linear regulation and load regulation are better than standard fixed voltage regulators. The LM117/LM317 has built-in protection circuits such as overload protection and safety zone protection.
Normally the LM117/LM317 does not require an external capacitor unless the input filter capacitor is more than 6 inches (approximately 15 cm) from the LM117/LM317 input. Using output capacitors can change the transient response. Using the filter capacitor on the regulation side results in a much higher ripple rejection ratio than the standard three-terminal regulator.
The LM117/LM317 can have many special uses. For example, suspending the adjustment terminal to a higher voltage can be used to regulate voltages up to hundreds of volts as long as the input and output voltage difference does not exceed the limit of the LM117/LM317. Of course, avoid shorting the output. It is also possible to connect the trim terminal to a programmable voltage for a programmable power supply output. The circuit is applied to the pre-stage audio circuit, precision circuit, electronic production and other circuits that require high-precision power supply for the power supply. The internal resistance is small, the voltage is stable, the noise is extremely low, and the output ripple is small (the output terminal only uses 100uf). Effectively ensure the high stability of the NE5532, NE5535 and other audio circuits, improve transient characteristics and high frequency characteristics. (The actual use effect is better than the voltage regulator modules such as LM78xx and LM79xx)
Feature Description Adjustable output voltage as low as 1.2V.
Guaranteed 1.5A output current.
Typical linearity adjustment is 0.01%.
Typical load regulation is 0.1%.
80dB ripple rejection ratio.
Output short circuit protection.
Overcurrent, overheat protection.
Adjust the safe working area protection of the tube.
Standard three-terminal transistor package.
voltage range
Input and output minimum differential voltage drop to 0.2V
LM117/LM317 1.25V to 37V continuously adjustable. Package form
TO-220 plastic package, TO-3 aluminum package, TO-202 plastic package, TO-39 metal package
Application circuit diagram: LM317
LM337
1.25V voltage reference between 1, 2 feet. To ensure the output performance of the regulator, R1 should be less than 240 ohms. The regulated voltage value can be adjusted by changing the value of R2. D1, D2 are used to protect the LM317/337.
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