Tuesday, February 10, 2015

Circuit Schematic 12V to 24V @ 1A Step-up Switching Regulator using LM2585

Eltronicschool. - Do you want to make your self switching regulator now? Circuit schematic like in figure 1 below show you 12V to 24V @ 1A Step-up Switching Regulator using LM2585 that we get from other site that discuss this circuit.

Circuit Schematic
Figure 1. Schematic 12V to 24V @ 1A Step-up Switching Regulator using LM2585
(Source: www.electronics-lab.com)
Component List
  • C1,C2 33uF, 25V, 1Ω
  • C3 0.1uF, 50V, 0Ω
  • C4 1 uF, 25V
  • C5,C6 220uF, 35V, 0.15Ω
  • D1 0.45 V, 3A, 40V Schottky Diode
  • IC1 LM2585S-ADJ
  • L1 120 uH, 0.04Ω
  • R1 28 KΩ
  • R2 1.5 KΩ
  • R3 1.5 KΩ
  • R4 8.2 KΩ
  • LED  white SMD led


Circuit schematic like in figure 1 above is . This is a DC-DC step-up converter based on LM2585-ADJ regulator manufactured by Texas Instruments. This IC was choosen for it's simplicity of use, requiring minimal external components and for it's ability to control the output voltage by defining the feedback resistors (R1,R2). NPN switching/power transistor is intergrated inside the regulator and is able to withstand 3A maximum current and 65V maximum voltage. Switching frequency is defined by internal oscillator and it's fixed at 100KHz.

Schematic is a simple boost topology arranement based on datasheet. Input capacitors and diode should be placed close enought to the regulator to minimize inductance effects of pcb traces. IC1, L1, D1, C1,C2 and C5,C6 are the main parts used in voltage convertion. Capacitor C3 is a high frequency bypass capacitor and should be placed as close to IC1 as possible.

All components are selected for their low loss characteristics. So capacitors selected have low ESR and inductor selected has low DC resistance.

At maximum output power there is significant heat produced by IC1 and for that reason we mounted it directly on the ground plane to achieve maximum heat radiation.

  1. Vin           10-15V DC 
  2. Vout          24V
  3. Iout          1A
  4. frequency 100KHz

Link Source: 

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