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LM5161

Texas Instruments
Part Number LM5161
Manufacturer Texas Instruments
Description Wide Input 100-V 1-A Synchronous Buck/Fly-Buck Converter
Published Oct 1, 2019
Detailed Description Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design LM5161 SNVSAE3B...
Datasheet PDF File LM5161 PDF File

LM5161
LM5161

Overview
Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design 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 undervoltage 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 c...


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