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LM5017 100-V, 600-mA Constant On-Time Synchronous Buck / Fly-Buck™ Regulator
SNVS783K
January 2012 – August 2021
LM5017
PRODUCTION DATA
CONTENTS
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LM5017 100-V, 600-mA Constant On-Time Synchronous Buck / Fly-Buck™ Regulator
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and 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
Timing Requirements
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Control Overview
7.3.2
VCC Regulator
7.3.3
Regulation Comparator
7.3.4
Overvoltage Comparator
7.3.5
On-Time Generator
7.3.6
Current Limit
7.3.7
N-Channel Buck Switch and Driver
7.3.8
Synchronous Rectifier
7.3.9
Undervoltage Detector
7.3.10
Thermal Protection
7.3.11
Ripple Configuration
7.3.12
Soft-Start
7.4
Device Functional Modes
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Application Circuit: 12.5-V to 95-V Input and 10-V, 600-mA Output Buck Converter
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
RFB1, RFB2
8.2.1.2.3
Frequency Selection
8.2.1.2.4
Inductor Selection
8.2.1.2.5
Output Capacitor
8.2.1.2.6
Type III Ripple Circuit
8.2.1.2.7
VCC and Bootstrap Capacitors
8.2.1.2.8
Input Capacitor
8.2.1.2.9
UVLO Resistors
8.2.1.3
Application Curves
8.2.2
Isolated DC/DC Converter Using LM5017
8.2.2.1
Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.2.1
Transformer Turns Ratio
8.2.2.2.2
Total IOUT
8.2.2.2.3
RFB1, RFB2
8.2.2.2.4
Frequency Selection
8.2.2.2.5
Transformer Selection
8.2.2.2.6
Primary Output Capacitor
8.2.2.2.7
Secondary Output Capacitor
8.2.2.2.8
Type III Feedback Ripple Circuit
8.2.2.2.9
Secondary Diode
8.2.2.2.10
VCC and Boostrap Capacitor
8.2.2.2.11
Input Capacitor
8.2.2.2.12
UVLO Resistors
8.2.2.2.13
VCC Diode
8.2.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.1.2
Development Support
11.1.2.1
Custom Design With WEBENCH® Tools
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Support Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DDA|8
MPDS092F
NGU|8
MPDS407A
Thermal pad, mechanical data (Package|Pins)
DDA|8
PPTD058I
Orderable Information
snvs783k_oa
snvs783k_pm
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