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Power Supply IC
DC-DC
DC-DC
Basic
Design
Evaluation
Application
Product Information
FAQ
Basic
Linear Regulator Basics
Operating Principles of Linear Regulator
Types of Linear Regulators
Its Circuit Configuration and Features
Advantages vs Disadvantages, and Applications
Important Specifications
Efficiency and Thermal Calculation
Switching Regulator Basics
Types of Switching Regulators
Advantages vs Disadvantages in Comparison with Linear Regulator
Supplement-Current Paths during Synchronous Rectifying Step-Down Converter Operation
Operating Principles of Buck Switching Regulator
Differences between Synchronous and Nonsynchronous Rectifying DC-DC Conversion
Control Methods (Voltage Mode, Current Mode, Hysteresis Control)
Efficiency Improvements at Light Load for the Synchronous Rectifying Type
Protective and Sequencing Functions
Considerations on Switching Frequencies
Behavior when Vin Falls Below Vout
Supplement-Protective Function: Output Pre-bias Protection
Concluding Remarks
Design
Overview of Selection of Inductors and Capacitors for DC-DC Converters
Basic Operation of Step-Down Converters
Inductor Selection
Selection of Output Capacitors
Selection of Input Capacitors
Supplement-Selection of Input Capacitors
Summary
Overview of DC-DC Converter PCB Layout
Ringing at switching nodes
Placement of input capacitors and output diodes
Placement of Thermal Vias
Placement of Inductors
Placement of Output Capacitors
Feedback Path Wiring
Ground
Resistance and Inductance of Copper Foil
Noise countermeasures: corner wiring, conducted noise, radiated noise
Noise countermeasures: snubber, bootstrap resistor, gate resistor
Summary
PCB Layout of a Step-Up DC-DC Converter – Introduction
The Importance of PCB Layout Design
Current Paths in Step-up DC-DC Converters
PCB Layout Procedure
Placement of Input Capacitors
Placement of Output Capacitors and Freewheel Diodes
Inductor Placement
Placement of Thermal Vias
Feedback Path Wiring
Ground
Layout for Synchronous Rectification Designs
Resistance and Inductance of Copper Foil
Relationship Between Corner Wiring and Noise
Summary
Evaluation
Overview of Characteristics and Evaluation Method of Switching Regulators
Types of Switching Regulators
Switching Regulator Basics
Step-Down Operation Principles
Bootstrap
Output Feedback Control Method
PWM & PFM
Important Characteristics ? IC Specifications
Important Characteristics ? Power Supply Characteristics
How to Read Power Supply IC Datasheets: Cover, Block Diagram, Absolute Maximum Ratings and Recommended Operating Conditions
Key to Electrical Characteristics
How to Interpret Properties Graphs and Waveforms
Application Circuit Examples
Component selection
Input Equivalent Circuits
Allowable Loss
Evaluating a Switching Regulator: Output Voltage
Load Regulation
Load Transient Response Consideration and Measurement Method
Inductor Current Measurement
Measurement of Efficiency
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
Failure to Start of a Power Supply Using a Linear Regulator, Case 1: Damage to the IC and Peripheral Components Due to Hand-Soldering
Case 2: Startup Problems Caused by Constant-Current Loads
About Parallel Connections of LDO Linear Regulators
Parallel Connection of LDOs Using Diodes
Parallel Connection of LDOs Using Ballast Resistors
Summary
Easy Stabilization/Optimization Methods for Linear Regulators – Introduction
About Step Response Method
Examples of Step Response Waveforms
Step Response Waveforms and Values of Related Components
Introduction
Power Supply Sequence Specification ①: Power Supply Sequence Specifications and Control Block Diagrams
Power Supply Sequence Specification①: Sequence Operation at Power Turn-on
Power Supply Sequence Specification①: Sequence Operation at Power Shutoff
Power Supply Sequence Specification①: Example of Actual Circuit and Component Value Calculations
Power Supply Sequence Specification①: Example of Actual Operations
Power Supply Sequence Specification②:Power Supply Sequence Specifications and Control Block Diagrams
Power Supply Sequence Specification②:Sequence Operation at Power Turn-on
Power Supply Sequence Specification②: Sequence Operation at Power Shutoff
Power Supply Sequence Specification②: Example of Actual Circuit and Component Value Calculations
Power Supply Sequence Specification②: Example of Actual Operations
Circuits to Implement Power Supply Sequences Using General-Purpose Power Supply ICs ーSummaryー
Product Information
Linear Regulators
Switching Regulators
Switching Regulators
FAQ
DC-DC FAQ
New Articles
DC-DC Application
Case 2: Startup Problems Caused by Constant-Current Loads
2023/11/22
DC-DC Application
Failure to Start of a Power Supply Using a Linear Regulator, Case 1: Damage to the IC and Peripheral Components Due to Hand-Soldering
2023/11/08
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Power Supply IC
DC-DC
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