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DC/DC 轉換器

LM34926

現行

適用隔離 DC/DC 轉換器的 7.5-100V 大範圍 Vin 300mA 整合式二次側偏壓穩壓器

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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.

LM34926

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) 0.3 Vin (max) (V) 100 Vin (min) (V) 9 Vout (max) (V) 90 Vout (min) (V) 1.25 Switch current limit (typ) (A) 0.7 Features Enable, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Operating temperature range (°C) -40 to 125 Duty cycle (max) (%) 90
Rating Catalog Topology Buck, Flybuck Iout (max) (A) 0.3 Vin (max) (V) 100 Vin (min) (V) 9 Vout (max) (V) 90 Vout (min) (V) 1.25 Switch current limit (typ) (A) 0.7 Features Enable, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Operating temperature range (°C) -40 to 125 Duty cycle (max) (%) 90
HSOIC (DDA) 8 29.4 mm² (4.9 mm × 6 mm) WSON (NGU) 8 16 mm² (4 mm × 4 mm)
  • Wide 7.5-V to 100-V Input Range
  • Integrated 300-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:
    • WSON-8
    • SO PowerPAD™-8 Packages
  • Create a Custom Design Using the LM34926 With the WEBENCH® Power Designer
  • Wide 7.5-V to 100-V Input Range
  • Integrated 300-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:
    • WSON-8
    • SO PowerPAD™-8 Packages
  • Create a Custom Design Using the LM34926 With the WEBENCH® Power Designer

The LM34926 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 LM34926 requires no loop compensation and provides excellent transient response. The regulator operates with an on-time control 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 undervoltage comparator to inhibit operation during low-voltage conditions. Protection features include thermal shutdown and VCC Undervoltage Lockout (UVLO). The LM34926 device is offered in WSON-8 and SO PowerPAD-8 plastic packages.

The LM34926 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 LM34926 requires no loop compensation and provides excellent transient response. The regulator operates with an on-time control 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 undervoltage comparator to inhibit operation during low-voltage conditions. Protection features include thermal shutdown and VCC Undervoltage Lockout (UVLO). The LM34926 device is offered in WSON-8 and SO PowerPAD-8 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 LM34926 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters datasheet (Rev. F) PDF | HTML 2017/11/30
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

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM34926EVAL — 適用於 LM34926 的評估板

An isolated bias supply is implemented in this evaluation board with LM34926 Constant-On-Time regulator. LM34926 regulator integrates both the high and low side power switch- es essential for creating isolated buck converter.

使用指南: PDF
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模擬型號

LM34926 PSpice Transient Model

SNVM307.ZIP (40 KB) - PSpice 模型
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模擬型號

LM34926 TINA-TI Reference Design

SNVM363.TSC (679 KB) - TINA-TI 參考設計
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模擬型號

LM34926 TINA-TI Transient Spice Model

SNVM364.ZIP (10 KB) - TINA-TI Spice 模型
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模擬型號

LM34926 Unencrypted PSpice Transient Model

SNVM981.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
HSOIC (DDA) 8 Ultra Librarian
WSON (NGU) 8 Ultra Librarian
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