SNVSB06D
July 2018 – May 2020
LM5180
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Application
Typical Efficiency, VOUT = 5 V
4
Revision History
5
Description (continued)
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, 1 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
9.2.1.3
Application Curves
9.2.2
Design 2: PSR Flyback Converter With Dual Outputs of 15 V and –7.7 V at 200 mA
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.2.1
Flyback Transformer – T1
9.2.2.2.2
Flyback Diodes – DFLY1 and DFLY2
9.2.2.2.3
Input Capacitor – CIN
9.2.2.2.4
Feedback Resistor – RFB
9.2.2.2.5
UVLO Resistors – RUV1, RUV2
9.2.2.3
Application Curves
9.2.3
Design 3: PSR Flyback Converter With Stacked Dual Outputs of 24 V and 5 V
9.2.3.1
Design Requirements
9.2.3.2
Detailed Design Procedure
9.2.3.2.1
Flyback Transformer – T1
9.2.3.2.2
Feedback Resistor – RFB
9.2.3.2.3
UVLO Resistors – RUV1, RUV2
9.2.3.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Examples
12
Device and Documentation Support
12.1
Device Support
12.1.1
Third-Party Products Disclaimer
12.1.2
Development Support
12.1.3
Custom Design With WEBENCH® Tools
12.2
Documentation Support
12.2.1
Related Documentation
12.3
Receiving Notification of Documentation Updates
12.4
Support Resources
12.5
Trademarks
12.6
Electrostatic Discharge Caution
12.7
Glossary
13
Mechanical, Packaging, and Orderable Information
12.2.1
Related Documentation
For related documentation see the following:
LM5180EVM-S05 EVM User's Guide
(SNVU592)
LM5180EVM-DUAL EVM User's Guide
(SNVU609)
LM25184EVM-S12 EVM User's Guide
(SNVU680)
How an Auxless PSR-Flyback Converter can Increase PLC Reliability and Density
(SLYT779)
Why Use PSR-Flyback Isolated Converters in Dual-Battery mHEV Systems
(SLYT791)
IC Package Features Lead to Higher Reliability in Demanding Automotive and Communications Equipment Systems
(SNVA804)
PSR Flyback DC/DC Converter Transformer Design for mHEV Applications
(SNVA805)
Flyback Transformer Design Considerations for Efficiency and EMI
(SLUP338)
Under the Hood of Flyback SMPS Designs
(SLUP261)
White Papers:
Valuing Wide V
IN
, Low EMI Synchronous Buck Circuits for Cost-driven, Demanding Applications
(SLYY104)
An Overview of Conducted EMI Specifications for Power Supplies
(SLYY136)
An Overview of Radiated EMI Specifications for Power Supplies
(SLYY142)
AN-2162: Simple Success with Conducted EMI from DC-DC Converters
(SNVA489)
Using New Thermal Metrics
(SBVA025)
Semiconductor and IC Package Thermal Metrics
(SPRA953)