Variable Switching Power Supply Using LM2576 [Buck Converter, CC-CV]

Switching power supplies are known for high efficiency. An adjustable voltage/current supply is an interesting tool, which can be used in many applications such as a Lithium-ion/Lead-acid/NiCD-NiMH battery charger or a standalone power supply. In this article, we will learn to build a variable step-down buck converter using the popular LM2576-Adj chip.

Features

• Cheap and easy to build and use
• Constant current and constant voltage adjustment [CC, CV] capability
• 1.2V to 25V and 25mA to 3A controlling range
• Easy to adjust the parameters (optimum use of variable resistors to control the voltage and current)
• The design follows the EMC rules
• It is easy to mount a heatsink on the LM2576
• It uses a real shunt resistor (not a PCB track) to sense the current

Step 1: Schematic

Step 2: PCB Layout

Step 3: A 3D/Real View of the Asemblde PCB Board

Step 4: Component Libraries (SamacSys)

Step 5: References

Article source: http://bit.ly/2YshM5t

LM2576 Datasheet: https://www.onsemi.com/pub/Collateral/LM2576-D.PDF

LM358 Datasheet: https://www.onsemi.com/pub/Collateral/LM358-D.PDF

LM2576 Library: https://componentsearchengine.com/part-view/LM2576TV-ADJG/ON%20Semiconductor

LM358 Library: https://componentsearchengine.com/part.php?partID=671517

Altium Plugin: https://www.samacsys.com/altium-designer-library-instructions

Comments

[GstNiall]

Please tell me where I can buy the bare PCB board

[sam_moshiri]

Just check the main article source (I provided the link in the reference), You can read the full article there.
At the bottom of the article there is a link where you can order the PCB, Good luck

[Engineer_Girl]

A practical project with a PCB! nice.

[tytower]

Those library links are magic.