ZHCSL48
April 2020
LM5181-Q1
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
典型应用
典型效率 (VOUT = 5V)
4
修订历史记录
5
说明 (续)
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
器件和文档支持
12.1
器件支持
12.1.1
第三方产品免责声明
12.1.2
开发支持
12.1.3
使用 WEBENCH® 工具创建定制设计方案
12.2
文档支持
12.2.1
相关文档
12.3
接收文档更新通知
12.4
支持资源
12.5
商标
12.6
静电放电警告
12.7
Glossary
13
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
NGU|8
MPDS407A
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcsl48_oa
zhcsl48_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