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DC/DC 轉換器

LM34925

現行

適用隔離 DC/DC 轉換器的 7.5-100V 大範圍 Vin 100mA 整合式二次側偏壓穩壓器

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產品規格表

現在提供此產品的更新版本

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針腳對針腳的功能與所比較的裝置相同。
LM5168 現行 具有 Fly-Buck™ 功能的 6-V 至 120-V 大範圍 VIN、300-mA DC-DC 轉換器 120-V rating and lower IQ.

LM34925

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck, Flybuck Iout (max) (A) 0.1 Vin (max) (V) 100 Vin (min) (V) 9 Vout (max) (V) 90 Vout (min) (V) 1.25 Switch current limit (typ) (A) 0.3 Features Enable, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00005 Duty cycle (max) (%) 90
Rating Catalog Topology Buck, Flybuck Iout (max) (A) 0.1 Vin (max) (V) 100 Vin (min) (V) 9 Vout (max) (V) 90 Vout (min) (V) 1.25 Switch current limit (typ) (A) 0.3 Features Enable, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00005 Duty cycle (max) (%) 90
WSON (NGU) 8 16 mm² (4 mm × 4 mm) HSOIC (DDA) 8 29.4 mm² (4.9 mm × 6 mm)
  • Wide 7.5-V to 100-V Input Range
  • Integrated 100-mA High-Side,
    and Low-Side Switches
  • No Schottky Required
  • Constant On-Time Control
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency
  • Intelligent Peak Current Limit
  • Adjustable Output Voltage From 1.225 V
  • Precision 2% Feedback Reference
  • Frequency Adjustable to 1 MHz
  • Adjustable Undervoltage Lockout (UVLO)
  • Remote Shutdown
  • Thermal Shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD™
  • Wide 7.5-V to 100-V Input Range
  • Integrated 100-mA High-Side,
    and Low-Side Switches
  • No Schottky Required
  • Constant On-Time Control
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency
  • Intelligent Peak Current Limit
  • Adjustable Output Voltage From 1.225 V
  • Precision 2% Feedback Reference
  • Frequency Adjustable to 1 MHz
  • Adjustable Undervoltage Lockout (UVLO)
  • Remote Shutdown
  • Thermal Shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD™

The LM34925 regulator features all of the functions needed to implement a low cost, efficient, isolated bias regulator. This high voltage regulator contains two 100-V N-Channel MOSFET switches: a high-side buck switch and a low-side synchronous switch. The constant-on-time (COT) control scheme employed in the LM34925 device requires no loop compensation and provides excellent transient response. The regulator operates with an on-time that is inversely proportional to the input voltage. This feature allows the operating frequency to remain relatively constant. An intelligent peak current limit is implemented with integrated sense circuit. Other features include a programmable input under voltage comparator to inhibit operation during low-voltage conditions. Protection features include thermal shutdown and VCC undervoltage lockout (UVLO). The LM34925 device is offered in 8-pin WSON and
8-pin SO PowerPAD plastic packages.

The LM34925 regulator features all of the functions needed to implement a low cost, efficient, isolated bias regulator. This high voltage regulator contains two 100-V N-Channel MOSFET switches: a high-side buck switch and a low-side synchronous switch. The constant-on-time (COT) control scheme employed in the LM34925 device requires no loop compensation and provides excellent transient response. The regulator operates with an on-time that is inversely proportional to the input voltage. This feature allows the operating frequency to remain relatively constant. An intelligent peak current limit is implemented with integrated sense circuit. Other features include a programmable input under voltage comparator to inhibit operation during low-voltage conditions. Protection features include thermal shutdown and VCC undervoltage lockout (UVLO). The LM34925 device is offered in 8-pin WSON and
8-pin SO PowerPAD plastic packages.
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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM34925 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters datasheet (Rev. G) PDF | HTML 2017/11/20
選擇指南 Power Management Guide 2018 (Rev. R) 2018/6/25
類比設計期刊 Fly-Buck(TM) converter provides EMC and isolation in PLC applications 2015/1/29
應用說明 AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 2014/12/17

設計與開發

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開發板

LM34925EVAL — LM34925 隔離偏壓電源評估模組

The LM34925EVAL evaluation board facilitates evaluation of the LM34925 100V, 100mA Constant On-Time Synchronous Buck Regulator. An isolated bias supply is implemented in this evaluation board with the LM34925 the Constant On-Time regulator. The LM34925 regulator integrates both the high and low (...)
使用指南: PDF
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模擬型號

LM34925 PSpice Transient Model (Rev. A)

SNVM163A.ZIP (34 KB) - PSpice 模型
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模擬型號

LM34925 TINA-TI Reference Design

SNVM375.TSC (192 KB) - TINA-TI 參考設計
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模擬型號

LM34925 TINA-TI Transient Spice Model

SNVM376.ZIP (10 KB) - TINA-TI Spice 模型
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模擬型號

LM34925 Unencrypted PSpice Transient Model

SNVM980.ZIP (2 KB) - PSpice 模型
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計算工具

FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator

此工具協助電源供應工程師根據規格選擇正確的隔離式 DC-DC 拓撲結構。根據選擇的拓撲結構，計算機還會推薦適合設計的 IC。

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
WSON (NGU) 8 Ultra Librarian
HSOIC (DDA) 8 Ultra Librarian
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