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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 (opt

Abstract: A high-quality switching power supply efficiency is as high as 95%, and the switching power supply loss is mostly from switching devices (MOSFETs and diodes), so the correct measurement of switching device losses is critical for efficiency analysis. So how do we accurately measure switching losses? First, switching loss Since the switch is a non-ideal device, its working process can be divided into four states, as shown in Figure 1. "On state" means that the switch tube is in the on state; "off state" means that the switch tube is in the off state; "on process"