JAJSIQ5A
March 2020 – August 2020
LM25184
PRODUCTION DATA
1
特長
2
アプリケーション
3
概要
4
Revision History
5
Pin Configuration and Functions
Pin Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Integrated Power MOSFET
7.3.2
PSR Flyback Modes of Operation
7.3.3
Setting the Output Voltage
7.3.3.1
Diode Thermal Compensation
7.3.4
Control Loop Error Amplifier
7.3.5
Precision Enable
7.3.6
Configurable Soft Start
7.3.7
External Bias Supply
7.3.8
Minimum On-Time and Off-Time
7.3.9
Overcurrent Protection
7.3.10
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Standby Mode
7.4.3
Active Mode
8
Application and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Design 1: Wide VIN, Low IQ PSR Flyback Converter Rated at 12 V, 1 A
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Custom Design With WEBENCH® Tools
8.2.1.2.2
Custom Design With Excel Quickstart Tool
8.2.1.2.3
Flyback Transformer – T1
8.2.1.2.4
Flyback Diode – DFLY
8.2.1.2.5
Leakgae Inductance Clamp Circuit – DF, DCLAMP
8.2.1.2.6
Output Capacitor – COUT
8.2.1.2.7
Input Capacitor – CIN
8.2.1.2.8
Feedback Resistor – RFB
8.2.1.2.9
Thermal Compensation Resistor – RTC
8.2.1.2.10
UVLO Resistors – RUV1, RUV2
8.2.1.2.11
Soft-Start Capacitor – CSS
8.2.2
Application Curves
8.2.3
Design 2: PSR Flyback Converter With Dual Outputs of 15 V and –8 V at 0.5 A
8.2.3.1
Design Requirements
8.2.3.2
Detailed Design Procedure
8.2.3.2.1
Flyback Transformer – T1
8.2.3.2.2
Flyback Diodes – DFLY1 and DFLY2
8.2.3.2.3
Input Capacitor – CIN
8.2.3.2.4
Output Capacitors – COUT1, COUT2
8.2.3.2.5
Feedback Resistor – RFB
8.2.3.2.6
Thermal Compensation Resistor – RTC
8.2.3.2.7
Output Voltage Clamp Zeners – DOUT1 and DOUT2
8.2.3.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Examples
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.1.2
Development Support
11.1.2.1
Custom Design With WEBENCH® Tools
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Support Resources
11.5
Trademarks
11.6
静電気放電に関する注意事項
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
パッケージ・オプション
メカニカル・データ(パッケージ|ピン)
NGU|8
MPDS407A
サーマルパッド・メカニカル・データ
7.2
Functional Block Diagram