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| 型号： | LM25117PSQX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 530 kHz SWITCHING FREQ-MAX, QCC24 |
| 封装： | 4 X 4 MM, LLP-24 |
| 文件页数： | 1/4页 |
| 文件大小： | 844K |
| 代理商： | LM25117PSQX |
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 |
|---|---|
| LM25117PSQX/NOPB | 功能描述:IC REG CTRLR BUCK PWM CM 24LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PowerWise® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| LM25117-Q1 | 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 |
| LM25117QPMH | 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 |
| LM25117QPMH/NOPB | 功能描述:DC/DC 开关控制器 Wide Input Range Sync Buck Cntlr 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 |
| LM25117QPMHE | 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 |
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