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參數資料
| 型號： | LM25117PMHE |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 530 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 844K |
| 代理商： | LM25117PMHE |
LM25117
September 7, 2011
Wide Input Range Synchronous Buck Controller with
Analog Current Monitor
General Description
The LM25117 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 LM25117 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 LM25117’s unique
analog telemetry feature provides average output current in-
formation. 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 4.5V to 42V
■ 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
30155001
2011 National Semiconductor Corporation
301550
www.national.com
LM25117
Wide
Input
Range
Synchronous
Buck
Controller
with
Analog
Current
Monitor
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM25117PMHE/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM25117PMHX | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wide Input Range Synchronous Buck Controller with Analog Current Monitor |
| LM25117PMHX/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM25117PMHXNOPB | 制造商:National Semiconductor 功能描述:DC DC Cntrlr Single-OUT Sync Buck 4.5V to 42V Input 20-Pin TSSOP EP T/R 制造商:National Semiconductor 功能描述:DC DC Cntrlr Single-OUT Sync Buck 4.5V to 42V Input 20-Pin HTSSOP EP T/R |
| LM25117PSQ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wide Input Range Synchronous Buck Controller with Analog Current Monitor |
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