LM2596 circuit Tags - Electronic Circuit Diagram https://circuitdiagram.net/tag/lm2596-circuit Schematic & PCB Design Fri, 22 Jul 2011 07:20:48 +0000 en-US hourly 1 https://i0.wp.com/circuitdiagram.net/wp-content/uploads/2016/10/cropped-ecd.jpg?fit=32%2C32&ssl=1 LM2596 circuit Tags - Electronic Circuit Diagram https://circuitdiagram.net/tag/lm2596-circuit 32 32 96547142 Multi Output DC to DC Converter https://circuitdiagram.net/multi-output-dc-to-dc-converter.html https://circuitdiagram.net/multi-output-dc-to-dc-converter.html#comments Fri, 22 Jul 2011 07:20:47 +0000 http://circuitdiagram.net/?p=1224 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… Read More »

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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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