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LM5160A

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LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter

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LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter

LM5160A

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Product details

Parameters

Vin (Max) (V) 65 Vin (Min) (V) 4.5 Iout (Max) (A) 2 Features Enable, Light Load Efficiency, Pre-Bias Start-Up, Synchronous Rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type WSON(12) open-in-new Find other Isolated DC/DC converters & modules

Package | Pins | Size

WSON (DNT) 12 16 mm² 4 x 4 open-in-new Find other Isolated DC/DC converters & modules

Features

  • Wide 4.5-V to 65-V Input Voltage Range
  • Integrated High-Side and Low-Side Switches
    • No External Schottky Diode Required
  • 2-A Maximum Load Current
  • Adaptive Constant On-Time Control
    • No External Loop Compensation
    • Fast Transient Response
  • Selectable Forced PWM or DCM Operation
    • FPWM Supports Multi-Output Fly-Buck™
  • Nearly Constant Switching Frequency
    • Resistor Adjustable up to 1 MHz
  • Programmable Soft-Start Time
  • Prebiased Start-Up
  • ±1% Feedback Voltage Reference
  • LM5160A Allows External VCC Bias
  • Inherent Protection Features for Robust Design
    • Peak Current Limiting Protection
    • Adjustable Input UVLO and Hysteresis
    • VCC and Gate Drive UVLO Protection
    • Thermal Shutdown Protection With Hysteresis
  • Create a Custom Design Using the LM5160A With the WEBENCH® Power Designer
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Description

The LM5160/A is a 65-V, 2-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The adaptive 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 LM5160/A is programmed through the FPWM pin to operate in continuous conduction mode (CCM) from no load to full load or to automatically switch to discontinuous conduction mode (DCM) at light load for higher efficiency. Forced CCM operation supports multiple-output and isolated Fly-Buck applications using a coupled inductor.

The LM5160A shares the same features and pin configuration as the LM5160. An external bias supply can be connected to the VCC pin of the LM5160A in Buck and Fly-Buck applications. This additional capability lowers IC power dissipation and improves efficiency at high input voltages.

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Technical documentation

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Type Title Date
* Data sheet LM5160, LM5160A Wide Input 65-V, 2-A Synchronous Buck / Fly-Buck™ DC/DC Converter datasheet (Rev. E) Oct. 12, 2018
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) Jul. 26, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Application note Powering Drones With a Wide VIN DC-DC Converter (Rev. A) Feb. 05, 2019
Technical article Why a wide VIN DC/DC converter is a good fit for high-cell-count battery-powered drones Nov. 21, 2017
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer Oct. 09, 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
Technical article How to design for EMC and isolation with Fly-Buck™ converters Jul. 28, 2015
User guide LM5160 Buck EVM User's Guide (Rev. B) Apr. 13, 2015
Technical article Simplifying higher current split-rail designs with Fly-Buck converters Mar. 05, 2015
User guide LM5160 FlyBuck (Isolated Buck) User’s Guide (Rev. A) Feb. 06, 2015
Application note Fly-Buck(TM) converter provides EMC and isolation in PLC applications Jan. 29, 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description

 

The LM5160DNTBKEVM evaluation board provides a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 5V output over an input range of 10V to 60V. The circuit delivers load currents to 1.5A. The application schematic is setup up to (...)

Features
  • 10V to 60V input voltage range
  • 5V target output voltage
  • Delivers up to 1.5A output load current
  • FET place holder for EN/UVLO shutdown feature
  • PWM mode pin feature to choose between CCM and DCM
View details
EVALUATION BOARD Download
document-generic User guide
49
Description

The LM5160DNTFBK evaluation module is designed to operate from a 24V nominal bus with an input voltage range of 18V to 32V.  It is capable of supplying 12V/400 mA to the load at the isolated output.  The nominal switching frequency is 300kHz.  The high side and low side MOSFETs are integrated in the (...)

Features
  • 18V to 32V input voltage range
  • 8V target primary output voltage and 12V secondary isolated output
  • Can deliver up to 400mA output secondary load with primary unloaded
  • FPWM pin connected directly to Vcc
View details

Design tools & simulation

SIMULATION MODEL Download
SNVM692.ZIP (92 KB) - PSpice Model
SIMULATION MODEL Download
SNVM965.ZIP (3 KB) - PSpice Model
CALCULATION TOOL Download
Fly-Buck and Flyback Topology Selector
FLYBUCK-FLYBACK-DESIGN-CALC — This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
Features
  • Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
  • Capability to design up to 6 isolated outputs
  • Recommends ICs for desired application design
  • Incorporates loop compensation in designs
  • Compares efficiency, external component count and transformer currents for every topology (...)
View details
CALCULATION TOOL Download
LM5160 Buck Regulator Quick Start Calculator
LM5160DNTBK-CALC — Welcome to the LM5160 Buck Regulator Quick Start Design Tool. This stand-alone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM5160 65V, 1.5A COT Buck Regulator. As such, the user can expeditiously arrive at an optimized design to meet the (...)
Features
  • Determine output filter inductance and input and output filter capacitances
  • Select components for soft-start, EN/UVLO resistors
  • Optimize and choose the ripple injection circuit required for your application
  • Determine the minimum input voltage available for a fixed output and switching frequency
View details
CALCULATION TOOL Download
LM5160 Fly-Buck Quick Start Calculator
LM5160DNTFBK-CALC — Welcome to the LM5160 Fly-Buck Regulator Quick Start Design Tool. This stand-alone tool facilitates and assists the power supply engineer with design of a DC/DC Fly-Buck regulator based on the LM5160 65V, 1.5A COT Fly-Buck Regulator. As such, the user can expeditiously arrive at an optimized design (...)
Features
  • Determine the maximum power handling capability of the part specific to the application
  • Determine the appropriate transformer turns ratio, input and output filter capacitances
  • Select components for soft-start, EN/UVLO resistors
View details
GERBER FILE Download
SNVC228.ZIP (1800 KB)

Reference designs

参考设计 Download
Non-isolated power architecture with diagnostics reference design for protection relay modules
TIDA-010055 — This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-, 12-, or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET, a power module with an (...)
document-generic Schematic
参考设计 Download
Leakage Current Measurement Reference Design for Determining Insulation Resistance
TIDA-00440 — This reference design measures insulation resistance up to 100 MΩ. It has an on-board isolated 500-Vdc power supply and an isolated signal conditioning circuit to measure the leakage current. This design is useful to find leakage due to insulation breakdown in transformer and motor windings.
document-generic Schematic
参考设计 Download
Dual-Output Isolated Fly-Buck Reference Design With an Ultra-Small Coupled Inductor
PMP15005 — PMP15005 uses the LM5160 in a Fly-Buck™ topology with the primary and secondary output both set to 5V nominal. The circuit accommodates a voltage input range from 14V to 36V, ideal for the 24-V nominal input rail. While the primary side is set at 5.4V nominally using the feedback resistors (...)
document-generic Schematic
参考设计 Download
Isolated Octo-output Fly-Buck Bias for IGBT Driver - Reference Design
PMP10531 — The PMP10531 reference design is an 8-output isolated Fly-Buck power supply for IGBT gate driver in motor drive or high voltage inverter applications. It takes 24V nominal input and provides 4 isolated sets of (+15V, -8V) bias voltage. The board is designed to provide driver bias power for 6 IGBTs (...)
document-generic Schematic
参考设计 Download
Isolated Tri-output Fly-Buck Power Supply for Industrial PLC Applications - Reference Design
PMP10532 — The PMP10532 reference design is an isolated Fly-Buck power supply for industrial applications. It takes 24V nominal input and provides three isolated outputs: +5V@1A and +/-15V@200mA. The design is suitable for providing isolated power supply to MCU and control circuits and positive/negative bias (...)
document-generic Schematic
参考设计 Download
Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design
TIDA-00486 — TIDA-00486 uses our SimpleLink Wi-Fi® CC3200 Internet-on-a-chip wireless MCU module to create a data bridge between an RS-485 network and a Wi-Fi network. The ISO15 transceiver provides an isolated RS-485 interface with up to 2500 VRMS of isolation. The LM5160 Fly-Buck™ power supply (...)
document-generic Schematic
参考设计 Download
Non-Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design
TIDA-00485 — TIDA-00485 uses our SimpleLink Wi-Fi CC3200 Internet-on-a-chip wireless MCU module to create a data bridge between an RS-485 network and a Wi-Fi® network. The SN65HVD72 transceiver provides the RS-485 interface with 12 kV of ESD protection and additional protection is provided on board. The (...)
document-generic Schematic
参考设计 Download
Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters Reference Design
TIDA-00199 — This reference design provides isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. Utilizing a Fly-Buck™ control topology, this reference design uses a single transformer for generating power (...)
document-generic Schematic document-generic User guide
参考设计 Download
document-generic Schematic
参考设计 Download
Class 3 Isolated Fly-Buck Power Module for PoE Application Reference Design
PMP10572 — The PMP10572 reference design is an single output isolated Fly-Buck power supply for PoE application. It takes 48V nominal input and provides 12V 1A output. The board is designed with TPS2378(PD controller) to provide 40V-57V input votlage and 12V 1SA output power. The design features the LM5160A (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
WSON (DNT) 12 View options

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