LM5000SDX-6/NOPB

更新时间： 2024-11-28 13:09:23

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美国国家半导体 - NSC		稳压器开关光电二极管高压
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LM5000SDX-6/NOPB 数据手册

February 2007

LM5000

High Voltage Switch Mode Regulator

General Description

Features

The LM5000 is a monolithic integrated circuit specifically de-

signed and optimized for flyback, boost or forward power

converter applications. The internal power switch is rated for

a maximum of 80V, with a current limit set to 2A. Protecting

the power switch are current limit and thermal shutdown cir-

cuits. The current mode control scheme provides excellent

rejection of line transients and cycle-by-cycle current limiting.

An external compensation pin and the built-in slope compen-

sation allow the user to optimize the frequency compensation.

Other distinctive features include softstart to reduce stresses

during start-up and an external shutdown pin for remote ON/

OFF control. There are two operating frequency ranges avail-

able. The LM5000-3 is pin selectable for either 300kHz (FS

Grounded) or 700kHz (FS Open). The LM5000-6 is pin se-

lectable for either 600kHz (FS Grounded) or 1.3MHz (FS

Open). The device is available in a low profile 16-lead TSSOP

package or a thermally enhanced 16-lead LLP package.

80V internal switch

■

Operating input voltage range of 3.1V to 40V

Pin selectable operating frequency

300kHz/700kHz (-3)

600kHz/1.3MHz (-6)

Adjustable output voltage

External compensation

Input undervoltage lockout

Softstart

■

Current limit

Over temperature protection

External shutdown

Small 16-Lead TSSOP or 16-Lead LLP package

Applications

Flyback Regulator

■

Forward Regulator

Boost Regulator

DSL Modems

Distributed Power Converters

■

Typical Application Circuit

20031901

LM5000 Flyback Converter

200319

www.national.com

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