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LM5025A

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具有 P 或 N 沟道钳位 FET 和 0.5V CS 阈值的 90V 有源钳位电压模式 PWM 控制器

产品详情

Topology Active-clamp forward, Forward Control mode Feedforward Duty cycle (max) (%) 80 Switching frequency (max) (kHz) 1000 Features Current limiting, High-voltage startup, Leading edge blanking, Soft start, Supports NFET clamp, Supports PFET clamp, Thermal shutdown UVLO thresholds on/off (V) Programmable/2.5V Operating temperature range (°C) -40 to 125 Rating Catalog Gate drive (typ) (A) 3 Vin (max) (V) 15
Topology Active-clamp forward, Forward Control mode Feedforward Duty cycle (max) (%) 80 Switching frequency (max) (kHz) 1000 Features Current limiting, High-voltage startup, Leading edge blanking, Soft start, Supports NFET clamp, Supports PFET clamp, Thermal shutdown UVLO thresholds on/off (V) Programmable/2.5V Operating temperature range (°C) -40 to 125 Rating Catalog Gate drive (typ) (A) 3 Vin (max) (V) 15
TSSOP (PW) 16 32 mm² 5 x 6.4 WSON (NHQ) 16 25 mm² 5 x 5
  • Internal Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • Programmable Line Undervoltage Lockout (UVLO) With Adjustable Hysteresis
  • Voltage Mode Control With Feedforward
  • Adjustable Dual Mode Overcurrent Protection
  • Programmable Overlap or Dead Time Between the Main and Active Clamp Outputs
  • Volt × Second Clamp
  • Programmable Soft Start
  • Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator UP and DOWN Sync Capability
  • Precision 5-V Reference
  • Thermal Shutdown
  • Packages:
    • 16-Pin TSSOP
    • Thermally Enhanced 16-Pin WSON (5 mm × 5 mm)
  • Internal Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • Programmable Line Undervoltage Lockout (UVLO) With Adjustable Hysteresis
  • Voltage Mode Control With Feedforward
  • Adjustable Dual Mode Overcurrent Protection
  • Programmable Overlap or Dead Time Between the Main and Active Clamp Outputs
  • Volt × Second Clamp
  • Programmable Soft Start
  • Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator UP and DOWN Sync Capability
  • Precision 5-V Reference
  • Thermal Shutdown
  • Packages:
    • 16-Pin TSSOP
    • Thermally Enhanced 16-Pin WSON (5 mm × 5 mm)

The LM5025A is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025A are that the CS1 and CS2 current limit thresholds have been increased to 0.5 V, the internal CS2 filter discharge device has been disabled and no longer operates each clock cycle, and the internal VCC and VREF regulators continue to operate when the line UVLO pin is below threshold.

The LM5025A PWM controller contains all of the features necessary to implement power converters using the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided: the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The two internal compound gate drivers parallel both MOS and bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1 MHz and total PWM and current sense propagation delays less than 100 ns. The LM5025A includes a high-voltage start-up regulator that operates over a wide input range of 13 V to 90 V. Additional features include: line undervoltage lockout (UVLO), soft start, oscillator UP and DOWN sync capability, precision reference, and thermal shutdown.

The LM5025A is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025A are that the CS1 and CS2 current limit thresholds have been increased to 0.5 V, the internal CS2 filter discharge device has been disabled and no longer operates each clock cycle, and the internal VCC and VREF regulators continue to operate when the line UVLO pin is below threshold.

The LM5025A PWM controller contains all of the features necessary to implement power converters using the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided: the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The two internal compound gate drivers parallel both MOS and bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1 MHz and total PWM and current sense propagation delays less than 100 ns. The LM5025A includes a high-voltage start-up regulator that operates over a wide input range of 13 V to 90 V. Additional features include: line undervoltage lockout (UVLO), soft start, oscillator UP and DOWN sync capability, precision reference, and thermal shutdown.

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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 LM5025A Active Clamp Voltage Mode PWM Controller 数据表 (Rev. F) PDF | HTML 2016年 8月 18日
技术文章 Excuse me for being a little forward... with my topology PDF | HTML 2015年 10月 21日
用户指南 LM5025 Isolated Active Clamp Forward Converter Ref Design User Guide 2012年 1月 27日
应用手册 Operation and Benefits of Active-Clamp Forward Power Converters 2007年 3月 22日

设计和开发

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评估板

LM5025AEVAL — 有源钳位电压模式 PWM 控制器

The LM5025A evaluation board is designed to provide the design engineer with a fully functional power converter based on the Active Clamp Forward topology to evaluate the LM5025A controller. The evaluation board is provided in an industry standard half-brick footprint.

用户指南: PDF
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仿真模型

LM5025A Unencrypted PSpice Transient Model Package (Rev. A)

SNVM477A.ZIP (48 KB) - PSpice Model
计算工具

SLUC655 LM5025A Design Calculator

支持的产品和硬件

支持的产品和硬件

产品
PWM 控制器
LM5025A 具有 P 或 N 沟道钳位 FET 和 0.5V CS 阈值的 90V 有源钳位电压模式 PWM 控制器
参考设计

PMP4468 — 18V 至 36Vdc 输入、5V/30W 有源钳位正激式参考设计

PMP4468 是一款面向工业和电信应用的隔离式直流/直流模块参考设计。直流输入范围为 18V 至 36V,具有 24V 典型输入和 5V 6A 输出。此设计中采用了有源钳位正激式控制器 LM5025A。效率高达 90%,同时提供良好的热性能。
测试报告: PDF
原理图: PDF
参考设计

PMP4428 — 面向工业应用的薄型 18-40Vin 隔离式 5V/6A 电源参考设计

此 5V/6A 解决方案实现高效有源钳位控制器 LM5025A 和自驱动同步整流器。输入电压为 18V-40V,符合典型的工业要求,输入电压为 24V 时的全载效率为 89.5%。变压器嵌入到 PCB 中,因此可以满足 8mm 高度要求。该设计适用于高度受限的工业应用。
测试报告: PDF
原理图: PDF
封装 引脚 下载
TSSOP (PW) 16 查看选项
WSON (NHQ) 16 查看选项

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
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

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