Categories: DC Converter

Multi Output DC to DC Converter


This is the circuit diagram of DC to DC converter based LM2596, the circuit has a single input supply and multiple voltage outputs. The circuit has an input voltage range of 15V to 40V. It has 5 outputs: 3.3V at 1.5A; +12V and ?12V at 50 mA each; and +5V and ?5V at 50 mA each. The 3.3V, +5V and ?5V outputs are regulated with ?5% accuracy over line and load variations.

Circuit parts list:

  • Cin : 220 uF, 50V, Nichicon UPL1H221MPH
  • C1: 270 uF, 63V, Nichicon UPL1J271MRH
  • C2, C3: 47 uF, 35V, Nichicon UPL1V470MPH
  • D1: MBR360,
  • D2, D3: 1N459,
  • C4, C5: 0.01 uF
  • IC1: LM2596-3.3 (SIMPLE SWITCHER? Step-Down Voltage Regulator)
  • IC2, IC3: LM78L05, and LM79L05. (3- Terminal Regulators)
  • L1: Custom Inductor with three windings (W1, W2 and W3) with the following specs:
  • W1: 47 uH; Peak Current: 2.6A, RMS Current ? 2.32A
  • W2: Number of turns = 3.4 x Number of turns in W1; RMS Current; 113 mA
  • W3: Same as W2

The +12V and ?12V outputs are regulated with ?20% accuracy. A typical application of this circuit is where the 3.3V output provides the power to the main circuit which is 3.3V logic, the ?5V outputs power the 5V logic and ?12V outputs provide the bias supply of op-amps.

The efficiency of the circuit with full load at all outputs is 75%. The ripple voltage across the 3.3V output is less than 20 mV and that across the ?12V outputs is less than 30 mV. The ripple across the ?5V is less than 10 mV.

Download the application notes fro this DC to DC converter circuit HERE

circuit schematic

View Comments

  • Dear Sir,

    We would like to introduce ourselves as registered supplier/indenter of various types of machinery/tools/Raw Material/electronics items with many of government and private sector organizations in our territory. One of our customers would like to purchase below mentioned items on urgent basis.

    S # DESCRIPTION UOM QTY
    1 POWER SUPPLY IN PUT VOLTAGE 220AC REGULATED O/P VOLTAGE 12V DC, 75A (WITH LOAD) WITH LOAD O/P VOLTAGE NOT LESS THAN 12V DC & WITH OUT LOAD O/P VOLTAGE 15V DC NOTE LOAD TESTING WILL BE FOR 10 MINUTES NO. 1
    2 TAPE, 18MM, BLACK/YELLOW, S/ADH MANF: BROTHER TZ-S641 FEC: 5215249
    BROTHER - TZ-S641 - TAPE, 18MM, BLACK/YELLOW, S/ADH
    Manufacturer: BROTHER
    Part # TZ-S641 NO. 5

    You are requested to please send us the literature along with your offer on C&F Basis for submission to the customer. You are requested to please reply through return mail.

    We are anxiously waiting for the reply.
    Thanking you in anticipation.

    Best regards

    Mobeen Ashraf
    Manager

    International Purchase Department

    Nazir & Sons International

    2ndFloor, PrachaPlaza, Near Municipal Committee Office, Faisal Shaheed Road, Taxila Pakistan.

    Ph No: 0092-51-4547995
    Fax No: 0092-51-4547997

    E-mail: international-purchase@nsipk.net

  • Help ! Please help me, pls teach me how to make a circuit 12v dc battery convert 9v dc supply the led luxenon 9v 10w. Thank you for your help.

Recent Posts

Switched ON Bike Lamp

Do you have a bicycle..? why don't try to build this circuit..?. Powered using battery…

54 years ago

3A Switching Power Supply Regulator

This is the circuit diagram of 3A switching power supply regulator: Simple and cheap, the…

54 years ago

Remote Control Tester

Here is the remote control tester circuit. This circuit is really a simple and easy…

54 years ago

Current Output Multiplier for 78xx Regulator

This is the circuit diagram of current output multiplier designed for regulator IC LM78xx. By…

54 years ago

4 Transistor FM Tracking Transmitter

The following diagram is the FM tracking transmitter based on 4 transistors. No additional notes…

54 years ago

White Line Follower

This is the circuit diagram of white line follower toy. The actuator of the toy…

54 years ago