DC-DC｜Evaluation
Conduction Losses due to the Inductor DCR
2018.12.20
Points of this article
・Conduction losses occur due to the inductor DCR (DC resistance) and the output current.
In this article, we consider losses related to the DCR of output inductors, which are the last of the individual places in a circuit at which losses occur. The output inductor corresponds to the blue area marked “PCOIL” in the diagram below.
Conduction Losses due to the Inductor DCR
The inductor DCR, the DC resistance, is the resistance component of the coil. Hence a loss occurs simply because of the DCR and the current flowing in the inductor. The place where the loss occurs is also simply the inductor itself. The flowing current is basically the output current IO. IO can also be determined from the inductor current IL.
Of course, the calculation is based on Ohm’s law.
In the next article, we will consider overall losses.
【Download Documents】Step-Down DC-DC Converter Examination of Losses
A hand book to study losses of synchronous rectifying step-down converters showing definitions of losses, relations to heat generation, loss equations for places at which losses occur in a circuit, examples of thermal calculation, relations to applications and Losses, and so on.
List of articles related to the「Conduction Losses due to the Inductor DCR」
- Introduction
- Definitions and Heat Generation
- Losses in Synchronous Rectifying Step-Down Converters
- Conduction Losses in Synchronous Rectifying Step-Down Converters
- Switching Losses in Synchronous Rectifying Step-Down Converters
- Dead Time Losses in Synchronous Rectifying Step-Down Converters
- Controller IC Power Consumption Losses in a Synchronous Rectifying Step-Down Converter
- Gate Charge Losses in a Synchronous Rectifying Step-Down Converter
- Example of Power Loss Calculation for a Power Supply IC
- Simplified Method of Loss Calculation
- Heat Calculation for Package Selection: Example 1
- Heat Calculation for Package Selection: Example 2
- Loss Factors
- Matters to Consider When Studying Miniaturization by Raising the Switching Frequency
- Important Matters when Studying High Input Voltage Applications
- Important Matters when Studying Large Output Currents Applications: Part 1
- Important Matters when Studying Large Output Currents Applications: Part 2
- Summary
Download Technical Documents
Basic of Linear Regulators and Switching Regulators
Basic studies for linear regulators and switching regulators as a DC-DC converter.
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- Basic
- Design
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Evaluation
- Overview of Characteristics and Evaluation Method of Switching Regulators
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Introduction
- Definitions and Heat Generation
- Losses in Synchronous Rectifying Step-Down Converters
- Conduction Losses in Synchronous Rectifying Step-Down Converters
- Switching Losses in Synchronous Rectifying Step-Down Converters
- Dead Time Losses in Synchronous Rectifying Step-Down Converters
- Controller IC Power Consumption Losses in a Synchronous Rectifying Step-Down Converter
- Gate Charge Losses in a Synchronous Rectifying Step-Down Converter
- Conduction Losses due to the Inductor DCR
- Example of Power Loss Calculation for a Power Supply IC
- Simplified Method of Loss Calculation
- Heat Calculation for Package Selection: Example 1
- Heat Calculation for Package Selection: Example 2
- Loss Factors
- Matters to Consider When Studying Miniaturization by Raising the Switching Frequency
- Important Matters when Studying High Input Voltage Applications
- Important Matters when Studying Large Output Currents Applications: Part 1
- Important Matters when Studying Large Output Currents Applications: Part 2
- Summary
- Application
- Product Information
- FAQ