参数资料
型号: LM25117PMH
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 稳压器
英文描述: SWITCHING CONTROLLER, 530 kHz SWITCHING FREQ-MAX, PDSO20
封装: TSSOP-20
文件页数: 1/4页
文件大小: 844K
代理商: LM25117PMH
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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相关代理商/技术参数
参数描述
LM25117PMH/NOPB 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
LM25117PMHE 制造商:TI 制造商全称:Texas Instruments 功能描述:Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMHE/NOPB 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
LM25117PMHX 制造商:TI 制造商全称:Texas Instruments 功能描述:Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMHX/NOPB 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK