L200 | Electronic Project Circuits

Posts Tagged ‘L200’

Simple Choc Block Supply by L200

A very simple adjustable power supply can be built on a single piece of chocolate block based on the L200CV IC. The output is variable between 0 and 30V, with an adjustable current limit up to 2 amps.

This very simple, low component count project aims to provide a low current, adjustable power supply that is often required for testing electronic circuits. The supply is based on the L200CV, this is an adjustable current and voltage regulator. The circuit is based on an example given in the L200CV datasheet which can be found at:

http://www.st.com/stonline/books/pdf/docs/1318.pdf

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Universal PSU 4A 0-24V by L200

Circuit :Volker Jeschkeit

Description:
A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps.

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Soft Start Power Supply with IC LM317 and L200

In order to perform this soft-start function, the LM317 voltage regulator IC requires an external universal PNP transistor and the L200 uses its internal comparator (pin 2).
After switch-on, the rising voltage on the positive side of the charging electrolytic capacitor slowly turns the (initially conducting) transistor off, thus raising the voltage (relative to ground) on the adjustment pin of the LM317.

The output voltage rises slowly and reaches 15 V in 5 seconds.
In the L200 circuit, the corresponding electrolytic capacitor’s rising voltage gradually relaxes the current-regulation loop inside the L200.
Source:http://www.zen22142.zen.co.uk/Circuits/Power/softstart.htm