Sunday, May 26, 2019

Adjustable power supply 1.25v to 33V and 3 Amperes with LM350 + PCB

Adjustable power supply 1.25v to 33V and 3 Amperes with LM350 + PCB

Portuguese Version: Click Here

Nowadays it is very necessary to have a power supply on a bench to test our designs, components, maintenance circuits among others, but this PS must be with voltage adjustments, since each circuit, each project, has its voltage different feed.
Today, we are going to make an adjustable power supply that goes from 1.25v to 33 volts with a current of 3 Amperes, which is enough for most of the projects, and still this PS has protection circuit against short circuit and over-temperature protection.

The LM350 is an adjustable three-pin positive voltage regulator capable of delivering 3.0 Amperes in an output voltage range of 1.2 V to 33 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to adjust the output voltage.

In addition:
  • Internal Current Limiting
  • Thermal shutdown
  • Secure Area Compensation

What do the LM350 integrated circuit, an essentially explosion-proof component.

The LM350 serves a wide variety of applications:
  • Static Voltage Regulator for digital circuits
  • Stable Current Regulator
  • Variable Current Regulator
This device also do an especially simple adjustable switching regulator, a programmable output regulator or connecting a fixed resistor between the setting and the output, the LM350 can be used as a precision current regulator:
  • Guaranteed 3.0 The output current
  • Adjustable output between 1.2 V and 33 V
  • Load Regulation Normally 0.1%
  • Line Regulation Normally 0.005% / V
  • Internal thermal overload protection
  • Temperature Short-Circuit Internal Current Limiting Current
  • Compensation of the safe area of the output transistor
  • Floating Operation for High Voltage Applications
  • Standard 3-way Transistor Package
  • Eliminates Socks Many Back Fix
The electric schematic diagram, it follows in the image below, it is quite simple, first we have the bridge GBJ2510 rectifier that is a bridge of 25 Amperes to 1000 Volts, however you can use any one that you have and that is above 4 Amperes over 50 Volts, diodes D2 and D3 are for protection of the LM350 IC, against short circuits, because when we start the PS, and the capacitor C3 filter is totally discharged, and it becomes as a short-circuit for the IC.
The C1 capacitor is to attenuate to ripples interference and stability of the same.
The capacitor C2 has the function of constancy to decrease Ripple, and stability of the source.
P1, is an analog potentiometer of 5K, if you do not have the 5K you can put a 4.7K, which is more commercial. T1 is a transformer of at least 3 Amperes, with input according to your local network, which can be 220v or 110v depending on your region, and the transformer secondary is 25 volts for the output of 33V DC.
For you who want to do a more powerful adjustable source, for example with 6 Amps, we have this adjustable module post in the link below:
Single module for adjustable bench power supply 6Amp 1.2 to 25V

Material list

  • CI - U1 – LM350T – Integrated circuit, voltage regulator
  • D1 – GBJ2510 – Silicon Rectifier Diode Bridge
  • D2, D3 – 1N4007- Silicon rectifier diodes
  • C2 – 4700 uF - 50V – Electrolytic capacitor
  • C3 – 100 uF - 50V – Electrolytic capacitor
  • R1 – 220 ohms - ½ W – red, red, brown
  • T1 – Transformer with primary according to the local and secondary network of 25 V with minimum current of 3A
  • P1 – 4,7 k ohms – Linear or logarithmic potentiometer
  • Other - wires, welding, plate, etc.
We are available to download the necessary materials for those who wish to mount with the suggested board the files in PNG, PDF and Gerber files for those who want to send to print.



Download Files:

Option 1: FVMTech Files
Option 2: FVMTech Files

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Shalom


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