JAJSIW8
April 2020
LM5181-Q1
PRODUCTION DATA.
1
特長
2
アプリケーション
3
概要
Device Images
代表的なアプリケーション
標準的な効率、VOUT = 5V
4
改訂履歴
5
概要(続き)
6
Pin Configuration and Functions
Pin Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Integrated Power MOSFET
8.3.2
PSR Flyback Modes of Operation
8.3.3
Setting the Output Voltage
8.3.3.1
Diode Thermal Compensation
8.3.4
Control Loop Error Amplifier
8.3.5
Precision Enable
8.3.6
Configurable Soft Start
8.3.7
External Bias Supply
8.3.8
Minimum On-Time and Off-Time
8.3.9
Overcurrent Protection
8.3.10
Thermal Shutdown
8.4
Device Functional Modes
8.4.1
Shutdown Mode
8.4.2
Standby Mode
8.4.3
Active Mode
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Design 1: Wide VIN, Low IQ PSR Flyback Converter Rated at 5 V, 0.5 A
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.2.1
Custom Design With WEBENCH® Tools
9.2.1.2.2
Custom Design With Excel Quickstart Tool
9.2.1.2.3
Flyback Transformer – T1
9.2.1.2.4
Flyback Diode – DFLY
9.2.1.2.5
Zener Clamp Circuit – DF, DCLAMP
9.2.1.2.6
Output Capacitor – COUT
9.2.1.2.7
Input Capacitor – CIN
9.2.1.2.8
Feedback Resistor – RFB
9.2.1.2.9
Thermal Compensation Resistor – RTC
9.2.1.2.10
UVLO Resistors – RUV1, RUV2
9.2.1.2.11
Soft-Start Capacitor – CSS
9.2.2
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Examples
12
デバイスおよびドキュメントのサポート
12.1
デバイス・サポート
12.1.1
デベロッパー・ネットワークの製品に関する免責事項
12.1.2
開発サポート
12.1.3
WEBENCH® ツールによるカスタム設計
12.2
ドキュメントのサポート
12.2.1
関連資料
12.3
ドキュメントの更新通知を受け取る方法
12.4
サポート・リソース
12.5
商標
12.6
静電気放電に関する注意事項
12.7
Glossary
13
メカニカル、パッケージ、および注文情報
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
発注情報
jajsiw8_oa
jajsiw8_pm
7.6
Typical Characteristics
V
IN
= 24 V, V
EN/UVLO
= 2 V (unless otherwise stated).
See
Figure 21
Figure 1.
Efficiency versus Load
See
Figure 21
I
OUT
= 0.5 A
Figure 3.
Primary-side Switching Waveform in BCM
Figure 5.
Active Quiescent Current versus Temperature
Figure 7.
RSET Current versus Input Voltage
Figure 9.
TC Voltage versus Temperature
Figure 11.
EN/UVLO Hysteresis Current versus Temperature
Figure 13.
Switch Peak Current Limits versus Temperature
Figure 15.
Minimum Switching Frequency versus Temperature
See
Figure 21
Figure 2.
Output Voltage versus Load
Figure 4.
Shutdown Quiescent Current versus Temperature
V
SS/BIAS
= 6 V
Figure 6.
Active Quiescent Current with BIAS versus Temperature
Figure 8.
RSET Current versus Temperature
Figure 10.
EN/UVLO Threshold Voltages versus Temperature
Figure 12.
MOSFET R
DS(on)
versus Temperature
Figure 14.
Minimum Switch On-Time versus Temperature
Figure 16.
Maximum Switching Frequency versus Temperature