Converter. LM5161 Datasheet

LM5161 Datasheet PDF


Part

LM5161

Description

Wide Input 100-V 1-A Synchronous Buck/Fly-Buck Converter

Manufacture

etcTI

Page 30 Pages
Datasheet
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LM5161 Datasheet
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LM5161
SNVSAE3B – MARCH 2016 – REVISED NOVEMBER 2017
LM5161 Wide Input 100-V, 1-A Synchronous Buck/Fly-Buck™ Converter
1 Features
1 Wide 4.5-V to 100-V Input Voltage Range
• Integrated High-Side and Low-Side Switches
– No Schottky Diode Required
• 1-A Maximum Load Current
• Constant ON-Time Control
– No External Loop Compensation
– Fast Transient Response
• Selectable DCM Buck Operation at Light Load
• CCM Option Supports Multi-Output Fly-Buck™
• No External Ripple circuit needed (at FPWM = 0)
• Nearly Constant Switching Frequency
• Frequency Adjustable Up to 1 MHz
• Programmable Soft-Start Time
• Prebias Start-Up
• Peak Current Limiting Protection
• Adjustable Input UVLO and Hysteresis
• ±1% Feedback Voltage Reference
• Thermal Shutdown Protection
• Create a Custom Design Using the LM5161 With
the WEBENCH® Power Designer
2 Applications
• Industrial Programmable Logic Controller
• IGBT Gate Drive Bias Supply
• Telecom DC-DC Primary and Secondary Side
Bias
• E-Meter Power Line Communication
• Low-Power (<12W), Isolated DC-DC (Fly-Buck)
3 Description
The LM5161 is a 100-V, 1-A synchronous step-down
converter with integrated high-side and low-side
MOSFETs. The constant-ON-time control scheme
requires no loop compensation and supports high
step-down ratios with fast transient response. An
internal feedback amplifier maintains ±1% output
voltage regulation over the entire operating
temperature range. The ON-time varies inversely with
input voltage resulting in nearly constant switching
frequency. Peak and valley current limit circuits
protect against overload conditions. The under-
voltage lockout (EN/UVLO) circuit provides
independently adjustable input undervoltage
threshold and hysteresis. The FPWM input pin in
LM5161 selects either the forced continuous
conduction mode (CCM) under all load levels or the
discontinuous conduction mode (DCM) under light or
no load conditions. When operating in forced CCM,
the LM5161 supports the multiple output and isolated
Fly-Buck applications. When programmed for the
DCM operation, the LM5161 provides a tightly
regulated buck output without any additional external
feedback ripple injection circuit.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM5161
HTSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Buck Application Circuit
VIN
VIN BST
LM5161 SW
RON
VOUT
EN/UVLO
FB
VCC
SS FPWM
AGND PGND
Typical Fly-Buck Application Circuit
VIN
VIN BST
VOUT-SEC
RON
SW
LM5161
EN/UVLO
FB
VCC
SS FPWM
AGND PGND
VOUT-PRI
Copyright © 2016, Texas Instruments Incorporated
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM5161 Datasheet
LM5161
SNVSAE3B – MARCH 2016 – REVISED NOVEMBER 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 ESD Ratings ............................................................ 4
6.3 Recommended Operating Conditions ...................... 4
6.4 Thermal Information ................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Switching Characteristics ......................................... 6
6.7 Typical Characteristics ............................................. 7
7 Detailed Description ............................................ 11
7.1 Overview ................................................................ 11
7.2 Functional Block Diagram ...................................... 11
7.3 Feature Description ................................................ 12
7.4 Device Functional Modes........................................ 15
8 Applications and Implementation ...................... 16
8.1 Application Information .......................................... 16
8.2 Typical Applications ................................................ 16
8.3 Do's and Don'ts ...................................................... 25
9 Power Supply Recommendations...................... 26
10 Layout................................................................... 26
10.1 Layout Guidelines ................................................ 26
10.2 Layout Example ................................................... 27
11 Device and Documentation Support ................. 28
11.1 Custom Design With WEBENCH® Tools ............. 28
11.2 Related Documentation ....................................... 28
11.3 Receiving Notification of Documentation Updates 28
11.4 Community Resources.......................................... 28
11.5 Trademarks ........................................................... 28
11.6 Electrostatic Discharge Caution ............................ 28
11.7 Glossary ................................................................ 28
12 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
Changes from Revision A (August 2016) to Revision B
Page
• Added links for WEBENCH; top nav icon for TI Designs ...................................................................................................... 1
• Deleted the lead temperature from the Abs Max table .......................................................................................................... 4
Changes from Original (March 2016) to Revision A
Page
• Product preview to Production Data Release ........................................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: LM5161
Copyright © 2016–2017, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design LM5161 SNVSAE 3B – MARCH 2016 – REVISED NOVEMBER 2017 LM5161 Wide Input 100-V, 1-A Synch ronous Buck/Fly-Buck™ Converter 1 Fe atures •1 Wide 4.5-V to 100-V Input V oltage Range • Integrated High-Side a nd Low-Side Switches – No Schottky Di ode Required • 1-A Maximum Load Curre nt • Constant ON-Time Control – No External Loop Compensation – Fast Tra nsient Response • Selectable DCM Buck Operation at Light Load • CCM Option Supports Multi-Output Fly-Buck™ • No External Ripple circuit needed (at F PWM = 0) • Nearly Constant Switching Frequency • Frequency Adjustable Up t o 1 MHz • Programmable Soft-Start Tim e • Prebias Start-Up • Peak Current Limiting Protection • Adjustable Inp ut UVLO and Hysteresis • ±1% Feedbac k Voltage Reference • Thermal Shutdow n Protection • Create a Custom Design Using the LM5161 With the WEBENCH® Power Designer 2 Applications • Industrial Programmable Logic Controller •.
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