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LM5181 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
SNVSBM6A
April 2020 – January 2021
LM5181
PRODUCTION DATA
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LM5181 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
1
Features
2
Applications
3
Description
4
Revision History
5
Description (continued)
6
Pin Configuration and 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
Device and Documentation Support
12.1
Device Support
12.1.1
Third-Party Products Disclaimer
12.1.2
Development Support
12.1.2.1
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
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
NGU|8
MPDS407A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsbm6a_oa
snvsbm6a_pm
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DATA SHEET
LM5181 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
1
Features
Functional Safety-Capable
Documentation available to aid functional safety system design
Designed for reliable and rugged applications
Wide input voltage range of 4.5 V to 65 V with operation down to 3.5 V after start-up
Robust solution with only one component crossing the isolation barrier
±1.5% total output regulation accuracy
Optional V
OUT
temperature compensation
6-ms internal or programmable soft start
Input UVLO and thermal shutdown protection
Hiccup-mode overcurrent fault protection
–40°C to +150°C junction temperature range
Integration reduces solution size and cost
Integrated 100-V, 0.4-Ω power MOSFET
No opto-coupler or transformer auxiliary winding required for V
OUT
regulation
Internal loop compensation
High-efficiency PSR flyback operation
Quasi-resonant MOSFET turn-off in BCM
Low input quiescent current
External bias option for improved efficiency
Single- and multi-output implementations
Ultra-low conducted and radiated EMI signatures
Soft switching avoids diode reverse recovery
Optimized for
CISPR 32
EMI requirements
Create a custom regulator design using
WEBENCH®
Power Designer
2
Applications
Isolated field transmitters
and
field actuators
Multi-output rails for
analog input modules
Motor drives
: IGBT and
SiC gate drive supplies
Building automation HVAC systems
Isolated bias supplies