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
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