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LM5025B

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具有 P 或 N 沟道钳位 FET 和 75% 最大占空比的 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) (%) 73 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) (%) 73 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
  • 3A Compound Main Gate Driver
  • Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
  • Voltage Mode Control with Feed-Forward
  • Adjustable Dual Mode Over-Current Protection
  • Programmable Overlap or Deadtime between the Main and Active Clamp Outputs
  • Volt x Second Maximum Duty Cycle Clamp
  • Programmable Soft-Start
  • Current Sense Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator Up / Down Sync Capability
  • Precision 5V Reference
  • Thermal Shutdown

Packages

  • TSSOP-16
  • WSON-16 (5x5 mm) Thermally Enhanced

All trademarks are the property of their respective owners.

  • Internal Start-Up Bias Regulator
  • 3A Compound Main Gate Driver
  • Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
  • Voltage Mode Control with Feed-Forward
  • Adjustable Dual Mode Over-Current Protection
  • Programmable Overlap or Deadtime between the Main and Active Clamp Outputs
  • Volt x Second Maximum Duty Cycle Clamp
  • Programmable Soft-Start
  • Current Sense Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator Up / Down Sync Capability
  • Precision 5V Reference
  • Thermal Shutdown

Packages

  • TSSOP-16
  • WSON-16 (5x5 mm) Thermally Enhanced

All trademarks are the property of their respective owners.

The LM5025B is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025B are as follows:

  • The maximum PWM duty cycle is limited to less than 75% to reduce voltage stress on the power MOSFETs.
  • The CS2 hiccup mode threshold is increased to 0.5V
  • The CS2 filter discharge device is disabled
  • The VCC regulator continues to operate when the line UVLO is below the threshold of normal operation
  • The VREF regulator is switched off when the line UVLO input falls below the operating threshold
  • The internal 5kΩ COMP pin pull-up resistor is removed

The LM5025B PWM controller contains all of the features necessary to implement power converters utilizing 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 1MHz and total PWM and current sense propagation delays less than 100ns.

The LM5025B includes a high-voltage start-up regulator that operates over a wide input range of 13V to 100V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown.

The LM5025B is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025B are as follows:

  • The maximum PWM duty cycle is limited to less than 75% to reduce voltage stress on the power MOSFETs.
  • The CS2 hiccup mode threshold is increased to 0.5V
  • The CS2 filter discharge device is disabled
  • The VCC regulator continues to operate when the line UVLO is below the threshold of normal operation
  • The VREF regulator is switched off when the line UVLO input falls below the operating threshold
  • The internal 5kΩ COMP pin pull-up resistor is removed

The LM5025B PWM controller contains all of the features necessary to implement power converters utilizing 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 1MHz and total PWM and current sense propagation delays less than 100ns.

The LM5025B includes a high-voltage start-up regulator that operates over a wide input range of 13V to 100V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown.

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类型 标题 下载最新的英语版本 日期
* 数据表 LM5025B Active Clamp Voltage Mode PWM Controller 数据表 (Rev. B) 2013年 3月 21日
用户指南 LM5025 Isolated Active Clamp Forward Converter Ref Design User Guide 2012年 1月 27日

设计和开发

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仿真模型

LM5025B Unencrypted PSpice Transient Model Package (Rev. A)

SNVM478A.ZIP (66 KB) - PSpice Model
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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