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升压控制器（外部开关）

LM3481

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2.97V 至 48V 高效升压、SEPIC 和反激式控制器

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数据表

LM3481

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数据表 立即订购

产品详细信息

Vin (Min) (V) 2.97 Vin (Max) (V) 48 Vout (Min) (V) 1.26 Vout (Max) (V) 500 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 3.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up, UVLO Adjustable Duty cycle (Max) (%) 85 Rating Catalog Operating temperature range (C) -40 to 125
Vin (Min) (V) 2.97 Vin (Max) (V) 48 Vout (Min) (V) 1.26 Vout (Max) (V) 500 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 3.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up, UVLO Adjustable Duty cycle (Max) (%) 85 Rating Catalog Operating temperature range (C) -40 to 125
VSSOP (DGS) 10 9 mm² 3 x 3
  • LM3481QMM are Automotive-Grade Products
    That are AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • 10-Lead VSSOP Package
  • Internal Push-Pull Driver With 1-A Peak Current
    Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor
    and a Resistor
  • Internal Softstart
  • Current Mode Operation
  • Adjustable Undervoltage Lockout With Hysteresis
  • Pulse Skipping at Light Loads
  • Key Specifications
    • Wide Supply Voltage Range of 2.97 V to 48 V
    • 100-kHz to 1-MHz Adjustable and Synchronizable
      Clock Frequency
    • ±1.5% (Over Temperature) Internal
      Reference
    • 10-µA Shutdown Current (Over Temperature)
  • LM3481QMM are Automotive-Grade Products
    That are AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • 10-Lead VSSOP Package
  • Internal Push-Pull Driver With 1-A Peak Current
    Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor
    and a Resistor
  • Internal Softstart
  • Current Mode Operation
  • Adjustable Undervoltage Lockout With Hysteresis
  • Pulse Skipping at Light Loads
  • Key Specifications
    • Wide Supply Voltage Range of 2.97 V to 48 V
    • 100-kHz to 1-MHz Adjustable and Synchronizable
      Clock Frequency
    • ±1.5% (Over Temperature) Internal
      Reference
    • 10-µA Shutdown Current (Over Temperature)

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.
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技术文档

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类型 项目标题 下载最新的英语版本 日期
* 数据表 LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters 数据表 (Rev. F) PDF | HTML 05 Nov 2012
应用手册 LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A) 08 Apr 2019
技术文章 How to add overvoltage protection to a synchronous boost controller 17 Sep 2018
选择指南 电源管理指南 2018 (Rev. K) 31 Jul 2018
选择指南 电源管理指南 2018 (Rev. R) 25 Jun 2018
技术文章 Eliminating noise from the factory floor 29 Sep 2016
EVM 用户指南 LM3481 flyback EVM User Guide 19 May 2016
技术文章 How do you generate a high voltage from a single cell Li Ion battery? 11 Dec 2015
应用手册 Softstart Using Constant Current Constant Voltage Approach 24 Jul 2015
技术文章 Portable speaker power: Making the bass possible 12 May 2015
应用手册 Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co 11 Jul 2014
EVM 用户指南 AN-1756 LM3481 Evaluation Board (Rev. A) 01 May 2013
用户指南 AN-2094 LM3481 SEPIC Evaluation Board (Rev. A) 25 Apr 2013
应用手册 AN-1286 Compensation For The LM3478 Boost Controller (Rev. C) 23 Apr 2013
应用手册 AN-1484 Designing A SEPIC Converter (Rev. E) 23 Apr 2013
应用手册 AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A) 23 Apr 2013
应用手册 Modeling & Design of Current Mode Control Boost Converters (Rev. B) 23 Apr 2013
用户指南 330mW AC or DC Tiny Flyback Converter Power Supply Reference Design User Guide 27 Jan 2012

设计和开发

如需其他信息或资源，请查看下方列表，点击标题即可进入详情页面。

评估板

LM3481-FLYBACKEVM — 适用于 LM3481 升压控制器的隔离式反激拓扑评估模块

德州仪器 (TI) LM3481-FLYBACKEVM 可帮助设计人员在隔离反向拓扑中评估 LM3481 直流/直流升压控制器的性能。此 EVM 在 5.5V 至 36V 输入电压范围内运行，并提供 12V/2A 的隔离式输出。
TI.com 無法提供
评估板

LM3481EVAL — 具有 12V 输出的高效升压开关控制器评估板

The LM3481 is a current mode, low side N channel FET controller. It can be utilized in numerous configurations including a Boost, Flyback or SEPIC (Single Ended Primary Inductor Converter). This evaluation board demonstrates the flexibility of the LM3481 in a boost topology providing 12 volt output (...)

TI.com 無法提供
评估板

LM3481SEPICEVAL — LM3481 SEPIC 评估板

The LM3481 SEPIC evaluation board is designed to provide the design engineer with a fully functional power converter solution with two output voltage options. It produces a selectable output voltage of 12 V at 1.25A or 5V at 3A. The switching frequency for the converter is set to 500 kHz. The (...)

document-pdfAcrobat 用户指南
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仿真模型

LM3481 PSpice Average Model

SNVM170.ZIP (54 KB) - PSpice Model
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仿真模型

LM3481 TINA-TI Load Transient Reference Design (Rev. C)

SNVM229C.TSC (600 KB) - TINA-TI Reference Design
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仿真模型

LM3481 TINA-TI TRANSIENT SPICE MODEL (Rev. C)

SNVM230C.ZIP (29 KB) - TINA-TI Spice Model
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仿真模型

LM3481 TINA-TI Steady State Reference Design (Rev. B)

SNVM418B.TSC (600 KB) - TINA-TI Reference Design
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仿真模型

LM3481 Unencrypted PSpice Transient Model (Rev. D)

SNVM713D.ZIP (117 KB) - PSpice Model
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仿真模型

LM3481 TINA-TI Average Reference Design

SNVMA06.TSC (58 KB) - TINA-TI Reference Design
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仿真模型

LM3481 TINA-TI Average Spice Model

SNVMA07.ZIP (8 KB) - TINA-TI Spice Model
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仿真模型

LM3481 Unencrypted PSpice Average Model

SNVMA10.ZIP (1 KB) - PSpice Model
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仿真模型

LM3481 STARTUP TINA-TI TRANSIENT REFERENCE DESIGN

SNVMBT9.TSC (140 KB) - TINA-TI Reference Design
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模拟工具

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice®

PSpice® for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence® 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助 PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

在 PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)
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计算工具

FLYBUCK-FLYBACK-DESIGN-CALC — Fly-Buck 和反激式拓扑选择器

该工具可帮助电源工程师基于规格选择正确的隔离式直流-直流拓扑。根据所选择的拓扑，计算器还会针对设计建议正确的 IC。
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CAD/CAE 符号

330mW AC or DC Tiny Flyback Converter Power Supply Reference Design CAD File

SNVC023.ZIP (733 KB)
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许多 TI 参考设计都包括 LM3481

通过我们的参考设计选择工具来审查并确定最适用于您应用和参数的设计。
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封装 引脚数 下载
VSSOP (DGS) 10 了解详情

订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 认证摘要
  • 持续可靠性监测

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