LM5025B

現行

具 P 或 N 通道箝位 FET 和 75% 最大工作週期的 90V 主動箝位電壓模式 PWM 控制器

產品詳細資料

Vin (max) (V) 15 Operating temperature range (°C) -40 to 125 Control mode Feedforward Topology Active-clamp forward, Forward Rating Catalog Features Current limiting, High-voltage startup, Leading edge blanking, Soft start, Supports NFET clamp, Supports PFET clamp, Thermal shutdown Duty cycle (max) (%) 73
Vin (max) (V) 15 Operating temperature range (°C) -40 to 125 Control mode Feedforward Topology Active-clamp forward, Forward Rating Catalog Features Current limiting, High-voltage startup, Leading edge blanking, Soft start, Supports NFET clamp, Supports PFET clamp, Thermal shutdown Duty cycle (max) (%) 73
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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類型 標題 日期
* Data sheet LM5025B Active Clamp Voltage Mode PWM Controller datasheet (Rev. B) 2013年 3月 21日
User guide LM5025 Isolated Active Clamp Forward Converter Ref Design User Guide 2012年 1月 27日

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模擬型號

LM5025B Unencrypted PSpice Transient Model Package (Rev. A)

SNVM478A.ZIP (66 KB) - PSpice Model
封裝 針腳 CAD 符號、佔位空間與 3D 模型
TSSOP (PW) 16 Ultra Librarian
WSON (NHQ) 16 Ultra Librarian

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  • 認證摘要
  • 進行中持續性的可靠性監測
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