Multi Output DC to DC Converter

Multi 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

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4 thoughts on “Multi Output DC to DC Converter

  1. Mete Tizer

    I am interested in a circuit or manufactured item for 70VDC to 48-50 V DC
    K?ND REGARDS
    METE T?ZER

  2. MOBEEN ASHRAF

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    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

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  3. Sant Ram Singh

    Pls. publish diagram with higher current output same voltage.

  4. nguyen quoc tuan

    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.

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