LM3477A

更新时间： 2024-11-22 22:51:55

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关控制器
页数	文件大小	规格书
23页	809K
描述
High Efficiency High-Side N-Channel Controller for Switching Regulator

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数据手册

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LM3477A 数据手册

June 2002

LM3477/LM3477A

High Efficiency High-Side N-Channel Controller for

Switching Regulator

n Frequency compensation optimized with a single

capacitor and resistor

n Internal softstart

n Current mode operation

n Undervoltage lockout with hysteresis

n 8-lead Mini-SO8 (MSOP-8) package

General Description

The LM3477/A is a high-side N-channel MOSFET switching

regulator controller. It can be used in topologies requiring a

high side MOSFET such as buck, inverting (buck-boost) and

zeta regulators. The LM3477/A’s internal push pull driver

allows compatibility with a wide range of MOSFETs. This, the

wide input voltage range, use of discrete power components

and adjustable current limit allows the LM3477/A to be opti-

mized for a wide variety of applications.

Applications

n Local Voltage Regulation

n Distributed Power

The LM3477/A uses a high switching frequency of 500kHz to

reduce the overall solution size. Current-mode control re-

quires only a single resistor and capacitor for frequency

compensation. The current mode architecture also yields

superior line and load regulation and cycle-by-cycle current

limiting. A 5µA shutdown state can be used for power sav-

ings and for power supply sequencing. Other features in-

clude internal soft-start and output over voltage protection.

The internal soft-start reduces inrush current. Over voltage

protection is a safety feature to ensure that the output volt-

age stays within regulation.

n Notebook and Palmtop Computers

n Internet Appliances

n Printers and Office Automation

n Battery operated Devices

n Cable Modems

n Battery Chargers

Hysteretic

Threshold

LM3477

) 36% of

The LM3477A is similar to the LM3477. The primary differ-

ence between the two is the point at which the device

transitions into hysteretic mode. The hysteretic threshold of

the LM3477A is one-third of the LM3477.

programmed current

limit

LM3477A

) 12% of

programmed current

Features

limit

n 500kHz switching frequency

n Adjustable current limit

n 1.5% reference

See Hysteretic Threshold and section for more information.

n Thermal shutdown

Typical Application Circuit

20003333

Typical High Efficiency Step-Down (Buck) Converter

DS200033

www.national.com

12 3 4 5 6 7...23

中文翻译

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与LM3477A相关器件

型号	品牌	获取价格	描述	数据表
LM3477AMM	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477AMM/NOPB	NSC	获取价格	IC 1 A SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8, Switching Regulato
LM3477AMM/NOPB	TI	获取价格	用于开关稳压器的高效高侧 N 沟道控制器 \| DGK \| 8 \| -40 to 125
LM3477AMMX	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477AMMX/NOPB	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 575kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8
LM3477AMMX/NOPB	TI	获取价格	用于开关稳压器的高效高侧 N 沟道控制器 \| DGK \| 8 \| -40 to 125
LM3477MM	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477MM/NOPB	NSC	获取价格	IC 1 A SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8, Switching Regulato
LM3477MM/NOPB	TI	获取价格	用于开关稳压器的高效高侧 N 沟道控制器 \| DGK \| 8 \| -40 to 125
LM3477MMX	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator

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