參數(shù)資料
型號(hào)： LM5117PMHE
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 530 kHz SWITCHING FREQ-MAX, PDSO20
封裝： TSSOP-20
文件頁(yè)數(shù)： 1/32頁(yè)
文件大?。?/td> 844K
代理商： LM5117PMHE
LM5117
September 7, 2011
Wide Input Range Synchronous Buck Controller with
Analog Current Monitor
General Description
The LM5117 is a synchronous buck controller intended for
step-down regulator applications from a high voltage or widely
varying input supply. The control method is based upon cur-
rent mode control utilizing an emulated current ramp. Current
mode control provides inherent line feed-forward, cycle-by-
cycle current limiting and ease of loop compensation. The use
of an emulated control ramp reduces noise sensitivity of the
pulse-width modulation circuit, allowing reliable control of
very small duty cycles necessary in high input voltage appli-
cations.
The operating frequency is programmable from 50 kHz to 750
kHz. The LM5117 drives external high-side and low-side
NMOS power switches with adaptive dead-time control. A us-
er-selectable diode emulation mode enables discontinuous
mode operation for improved efficiency at light load condi-
tions. A high voltage bias regulator that allows external bias
supply further improves efficiency. The LM5117’s unique ana-
log telemetry feature provides average output current infor-
mation. Additional features include thermal shutdown, fre-
quency synchronization, hiccup mode current limit and
adjustable line under-voltage lockout.
Features
■ Emulated peak current mode control
■ Wide operating range from 5.5V to 65V
■ Robust 3.3A peak gate drives
■ Adaptive dead-time output driver control
■ Free-run or synchronizable clock up to 750kHz
■ Optional diode emulation mode
■ Programmable output from 0.8V
■ Precision 1.5% voltage reference
■ Analog current monitor
■ Programmable current limit
■ Hiccup mode over current protection
■ Programmable soft-start and tracking
■ Programmable line under-voltage lockout
■ Programmable switch-over to external bias supply
■ Thermal shutdown
Packages
■ TSSOP-20EP (Thermally enhanced)
■ LLP-24 (4mmx4mm)
Typical Application
30143201
2011 National Semiconductor Corporation
301432
www.national.com
LM5117
Wide
Input
Range
Synchronous
Buck
Controller
with
Analog
Current
Monitor
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM5117PMHE/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide Input Range Sync Buck Cntlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM5117PMHX/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM5117PSQ/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide Input Range Sync Buck Cntlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM5117PSQE/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide Input Range Sync Buck Cntlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM5117PSQX/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide Input Range Sync Buck Cntlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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