Datasheet > NCL2801

NCL2801

更新时间： 2024-11-25 02:51:59

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
28页	504K
描述
Power Factor Controller, High-Efficiency, Enhanced for Lighting

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NCL2801 数据手册

Power Factor Controller,

High-Efficiency,

Enhanced for Lighting

NCL2801

The 8−pin PFC controller NCL2801 is designed to drive PFC boost

stages. It is based on an innovative Valley Count Frequency

Fold−back (VCFF) method. The circuit classically operates in

Critical conduction Mode (CrM) for high load values. When the load

decreases a Discontinuous Conduction Mode DCM is forced by

forcing a dead time which, by construction corresponds to a fixed

number of valleys. The lower the output power, the higher the number

of valleys corresponding to the dead time. After DCM works down to

www.onsemi.com

SOIC−8

CASE 751

6 valley switching and if the load continues to decrease, a dead time

is continuously added to the 6 valley. The end of additional dead time

is synchronized with the drain voltage valley. The maximum

switching period is limited to 36.5 ms. VCFF maximizes the

efficiency during DCM and light load. In particular, the stand−by

losses are reduced to a minimum. Like in FCCrM controllers, internal

circuitry allows near−unity power factor even when the switching

frequency is reduced. Housed in a SO−8 package, the circuit also

incorporates the features necessary for robust and compact PFC

stages, with few external components.

MARKING DIAGRAMS

L2801abc

ALYW

General Features

L2801abc = Specific Device Code

• Near−Unity Power Factor

• Critical Conduction Mode (CrM)

• Valley Count Frequency Fold−Back (VCFF)

• Peak Current Control Mode to Maintain a Proper Current Shaping in

VCFF Mode

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

• Fast Line / Load Transient Compensation (Dynamic Response

PIN CONNECTIONS

Enhancer) Option

VCC

• Brown−out Detection

• Two−level Line Feed−Forward (HL&LL)

VCTRL

DRV

GND

ZCD

MULT

• Valley Turn−on (No Valley Hoping by Construction)

• High Drive Capability: −500 mA / +800 mA

(Top Views)

• V Range: from 10.5 V to 27 V

• Low Start−up Consumption for :

• [*C*]& [*D*] Option: Low V Start−up Level (12.5 V)

ORDERING INFORMATION

See detailed ordering and shipping information on page 25 of

this data sheet.

[*A*]& [*B*] Option: High V Start−up Level (17.0 V)

[*E*]& [*F*] Option: High V Start−up Level (10.5 V)

• This is a Pb−Free Device

Publication Order Number:

September, 2019 − Rev. 3

NCL2801/D

12 3 4 5 6 7...28

中文翻译

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