Datasheet > LM5119

LM5119

更新时间： 2024-09-29 11:36:39

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
24页	683K
描述
Wide Input Range Dual Synchronous Buck Controller

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中文翻译

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LM5119 数据手册

September 28, 2010

LM5119

Wide Input Range Dual Synchronous Buck Controller

General Description

Features

The LM5119 is a dual synchronous buck controller intended

for step-down regulator applications from a high voltage or

widely varying input supply. The control method is based up-

on current mode control utilizing an emulated current ramp.

Current mode control provides inherent line feed-forward, cy-

cle-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 ap-

plications. The switching frequency is programmable from

50kHz to 750kHz. The LM5119 drives external high-side and

low-side NMOS power switches with adaptive dead-time con-

trol. A user-selectable diode emulation mode enables discon-

tinuous mode operation for improved efficiency at light load

conditions. A high voltage bias regulator with automatic

switch-over to external bias further improves efficiency. Ad-

ditional features include thermal shutdown, frequency syn-

chronization, cycle-by-cycle and hiccup mode current limit

and adjustable line under-voltage lockout. The device is avail-

able in a power enhanced leadless LLP-32 package featuring

an exposed die attach pad to aid thermal dissipation.

Emulated peak current mode control

■

Wide operating range from 5.5V to 65V

Easily configurable for dual outputs or interleaved single

output

Robust 3.3A peak gate drive

■

Switching frequency programmable to 750kHz

Optional diode emulation mode

Programmable output from 0.8V

Precision 1.5% voltage reference

Programmable current limit

Hiccup mode overload protection

Programmable soft-start

Programmable line under-voltage lockout

Automatic switch-over to external bias supply

Channel2 enable logic input

Thermal Shutdown

Leadless LLP32 (5mm x 5mm) package

■

Typical Application

30124001

301240

www.national.com

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与LM5119相关器件

型号	品牌	获取价格	描述	数据表
LM5119_1	NSC	获取价格	Evaluation Board Input Voltage Range: 14V to 55V
LM5119PSQ	NSC	获取价格	Wide Input Range Dual Synchronous Buck Controller
LM5119PSQ/NOPB	TI	获取价格	5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32 \| -
LM5119PSQE	NSC	获取价格	Wide Input Range Dual Synchronous Buck Controller
LM5119PSQE/NOPB	TI	获取价格	5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32 \| -
LM5119PSQX	NSC	获取价格	Wide Input Range Dual Synchronous Buck Controller
LM5119PSQX/NOPB	TI	获取价格	5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32 \| -
LM5119Q	TI	获取价格	汽车级 5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器
LM5119QPSQ/NOPB	TI	获取价格	汽车级 5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32
LM5119QPSQX/NOPB	TI	获取价格	汽车级 5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32

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