SNVSB07C
July 2018 – April 2019
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Application
Typical Efficiency, VOUT = 5 V
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 5 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
Zener 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
8.2.1.3
Application Curves
8.2.2
Design 2: PSR Flyback Converter With Dual Outputs of 15 V and –7.7 V at 200 mA
8.2.2.1
Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.2.1
Flyback Transformer – T1
8.2.2.2.2
Flyback Diodes – DFLY1 and DFLY2
8.2.2.2.3
Input Capacitor – CIN
8.2.2.2.4
Feedback Resistor – RFB
8.2.2.2.5
UVLO Resistors – RUV1, RUV2
8.2.2.3
Application Curves
8.2.3
Design 3: PSR Flyback Converter With Stacked Dual Outputs of 24 V and 5 V
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
Feedback Resistor – RFB
8.2.3.2.3
UVLO Resistors – RUV1, RUV2
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
11.1.3
Custom Design With WEBENCH® Tools
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
10.2
Layout Examples
Figure 62.
LM5180-Q1
Single-Output PCB Layout
Figure 63.
LM5180-Q1
Dual-Output PCB Layout