MD3221N 데이터 시트보기 (PDF) - Shindengen
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MD3221N Datasheet PDF : 26 Pages
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MD3221N Synchronous Rectification DC-DC Converter Power IC
Contents
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1 Cautions for Use....................... 1
2 Outline ...................................... 3
Features
Product Code
Standard Connection Diagram
Pin Layout
Pin Functions
3 Specifications........................... 5
Absolute maximum ratings
Recommended Operating Conditions
Electrical Characteristics
Internal Block Diagrams
4 Selection of Primary Components and Pin Connections ... 7
Selecting the Output Choke Coil
Selecting the Output Condenser
Selecting the Input Condenser
Selecting the Regenerative Diode
5 Functions ................................ 10
Setting the Output Voltage
Selecting the Oscillation Frequency
The Soft Start Function
The Remote ON/OFF Function
The Reference Voltage
The Over-current Protection Function
Short-circuit Protection
The Curre nt Limiting Function
The Overheat Protection Function
Error Amp Gain Adjustment
Bootstrap
The L Cut (cut off detect) Function
6 Cautions for Pattern Design ..... 16
Primary Circuit Pattern Design
Control Circuit Pattern Design
7 Application Circuit Examples ... 17
Component Examples
8 Dimension Drawing ................ 18
9 Mounting................................. 19
Substrate Mounting Example
Cautions for Mounting
10 External Protection Circuits ... 20
Connection of Input Protection Devices
Connection of Over-voltage Protection Circuit
11 Characteristics ....................... 21
Output voltage : 3.3V
● Efficiency and Loss Characteristics
● Line Regulation
● Load Regulation
● Temperature Characteristics
● Start-up Characteristics
● R/C Start-up Characteristics
Efficiency by Output Voltage
● Efficiency by Output Voltage
Efficiency at Frequency of 100KHz
● Efficiency and Losses
12 Packaging ............................... 23
Tape and Reel
Packing
Ordering and Dimensions
2
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