Component selectionDesign tips
Characteristics
The buck converter, also step-down converter, is a very commonly used switching controller topology. The output voltage is always lower than the input voltage with the same polarity.
From an EMC point of view, the input line and the node between the diode, switching controller and power inductor, the so-called "hot node", are particularly critical. The power inductor represents the elementary component of the energy transfer. The power is usually in the range of a few watts.
Reference Designs
- https://www.we-online.com/rd006 3 W Dual-output isolated auxiliary supply for communication interfaces and measurement systems
Application Notes
- ANP010 Measurement DC-DC Switching Regulators
- ANP017 Designing Low-cost, Multiple Output DC/DC Converters
- ANP044 Impact of the layout, components, and filters on the EMC of modern DC/DC switching controllers
- ANP062 LC Filter Design With MLCCs: Why The Applied Voltage Matters
- ANP071 Aluminum Electrolyticvs.Aluminum Polymer Capacitor and how its benefits are used properly
- ANP096 EN What do rated current values mean
- ANS004 Input Filter for MagI³C Power Modules
- SN008 Expected Lifetime of Aluminum Electrolytic and Aluminum Polymer Capacitor
Products of interest
Videos
Power Modules Explained
Videos
EMI Debugging of a Low Power Buck Converter