产品详细信息

Vin (Min) (V) 2.97 Vin (Max) (V) 40 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) 2.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up Duty cycle (Max) (%) 100 Rating Catalog Operating temperature range (C) -40 to 125
Vin (Min) (V) 2.97 Vin (Max) (V) 40 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) 2.7 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up Duty cycle (Max) (%) 100 Rating Catalog Operating temperature range (C) -40 to 125
SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9
  • 8-lead VSSOP-8 and SOIC-8 packages
  • 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 Soft Start
  • Current Mode Operation
  • Undervoltage Lockout With Hysteresis
  • Create a Custom Design Using the LM3478 with the WEBENCH Power Designer
  • 8-lead VSSOP-8 and SOIC-8 packages
  • 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 Soft Start
  • Current Mode Operation
  • Undervoltage Lockout With Hysteresis
  • Create a Custom Design Using the LM3478 with the WEBENCH Power Designer

The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. 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 LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. 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 LM3478 High-Efficiency Low-Side N-Channel Controller for Switching Regulator 数据表 (Rev. X) PDF | HTML 28 Feb 2017
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
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
应用手册 小功率便携式音频产品(含Charger 和DC-DC)的辐射发射超标对策 07 Jan 2014
用户指南 AN-1204 LM3478/LM3488 Evaluation Board (Rev. A) 30 Oct 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
更多文献资料 Die D/S LM3478 MDC Hi Efficiency Low-Side N-Chan Controller For Switching Reg 25 Sep 2012
应用手册 Application Note 1286 Compensation For The LM3478 Boost Controller (cn) 19 May 2009
应用手册 Application Note 1484 Designing A SEPIC Converter (cn) 30 Apr 2008

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

LM3478EVAL — 用于开关稳压器的高效低侧 N 通道控制器

High Efficiency Low-Side N-Channel Controller for Switching Regulator

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仿真模型

LM3478 PSpice Transient Model (Rev. C)

SNVMAW8C.ZIP (124 KB) - PSpice Model
仿真模型

LM3478 Unencrypted PSpice Transient Model (Rev. B)

SNVMAW9B.ZIP (5 KB) - PSpice Model
仿真模型

LM3478 TINA-TI Average SEPIC Reference Design (Rev. A)

SNVMB83A.TSC (98 KB) - TINA-TI Reference Design
仿真模型

LM3478 TINA-TI Boost and SEPIC Average Spice Model (Rev. A)

SNVMB84A.ZIP (9 KB) - TINA-TI Spice Model
仿真模型

LM3478 PSpice Average Model

SNVMBH8.ZIP (170 KB) - PSpice Model
仿真模型

LM3478 Unencrypted PSpice Average Model

SNVMBL8.ZIP (2 KB) - PSpice Model
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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。

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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。
参考设计

TIDA-010046 — 采用 IEEE 802.3at 1 类 (≤ 12.95W) PoE-PD、符合 EMC 标准的 10/100Mbps 以太网 PHY 参考设计

此参考设计经过优化,适用于 10Mbps 至 100Mbps 带宽,使用低功耗以太网物理层 (PHY) DP83825,支持 150m CAT5e 电缆长度,该长度超出了标准以太网距离限制 100m(328 英尺)。此设计使用 IEEE802.3at 1 类 (13W) PoE-PD TPS23755 器件和采用集成式初级侧调节的反激式直流/直流控制器,通过以太网电缆进行电力输送和数据通信。此参考设计针对辐射发射、ESD 和 EFT 进行了预合规性测试。
参考设计

TIDA-01373 — EEPROM 编程工具参考设计

TIDA-01373 是一款可扩展编程工具的参考硬件和软件示例,适用于 DRV10983、DRV10975、DRV10983-Q1 和 DRV10987 集成型 BLDC 电机驱动器。这些器件采用需要设置为特定于电机参数的可配置 EEPROM 寄存器。此参考设计提供了有关如何同时将多达 8 个电机驱动器器件编程为特定于用户的 EEPROM 电机参数值的详细信息。
参考设计

PMP10077 — 高电压比 Vout/Vin、2W 升压转换器参考设计

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封装 引脚数 下载
SOIC (D) 8 了解详情
VSSOP (DGK) 8 了解详情

订购和质量

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  • 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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