L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode

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  • The L4981 I.C. provides the necessary features to achieve a very high power factor up to 0.99.

    Realized in BCD 60II technology this power factor corrector (PFC) pre-regulator contains all the control functions for designing a high efficiency-mode power supply with sinusoidal line current consumption.
    The L4981 can be easily used in systems with mains voltages between 85V to 265V without anyline switch. This new PFC offers the possibility to work at fixed frequency (L4981A) or modulated frequency (L4981B) optimizing the size of the input filter; both the operating frequency modes working with an average current mode PWM controller, maintaining sinusoidal line current without slope compensation.
    Besides power MOSFET gate driver, precise voltage reference (externally available), error amplifier, under voltage lockout, current sense and the soft start are included. To limit the number of the external components, the device integrates protections as overvoltage and overcurrent. The overcurrent level can be programmed using simple resistor for L4981A. For a better precision and for L4981B an external divider must be used.

    主要特性

    • PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
    • OVERVOLTAGE, OVERCURRENT PROTECTION
    • SOFT START
    • LOW START-UP CURRENT (0.3mA TYP.)
    • HIGH CURRENT BIPOLAR AND DMOS TOTEM POLE OUTPUT
    • CONTROL BOOST PWM UP TO 0.99P.F.
    • UNIVERSAL INPUT MAINS
    • LIMIT LINE CURRENT DISTORTION TO < 5%
    • AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY
    • UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
    • FEED FORWARD LINE AND LOAD REGULATION

电路原理图

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L4981BD SO-20 Tube
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1.125 1000 EAR99 MALAYSIA 查看供货情况

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L4981BD

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SO-20

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Tube

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Distributor availability ofL4981BD

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Farnell Element14 EUROPE 123 1 Order Now
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DIGIKEY

库存

628

Min.Order

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WORLDWIDE Order Now

RS COMPONENTS

库存

132

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103

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393

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代理商库存报告日期: 2019-09-18

供货状态

Active

Unit Price (US$)

1.125

数量

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4981BD013TR

封装

SO-20

包装类型

Tape And Reel

Unit Price (US$)

1.125*

Distributor availability ofL4981BD013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 808 1 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 4986 1 Order Now
Farnell Element14 EUROPE 10 1 Order Now

代理商库存报告日期: 2019-09-18

代理商名称

DIGIKEY

库存

808

Min.Order

1

地区

WORLDWIDE Order Now

ARROW

库存

5000

Min.Order

0

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MOUSER

库存

4986

Min.Order

1

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WORLDWIDE Order Now

Farnell Element14

库存

10

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EUROPE Order Now

代理商库存报告日期: 2019-09-18

供货状态

Active

Unit Price (US$)

1.125

数量

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4981AD

封装

SO-20

包装类型

Tube

Unit Price (US$)

0.984*

Distributor availability ofL4981AD

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 603 1 Order Now
RS COMPONENTS EUROPE 964 1 Order Now
ARROW EUROPE 325 0 Order Now
Newark Element14 AMERICA 126 0 Order Now
ARROW AMERICA 176 1000 Order Now
MOUSER WORLDWIDE 1153 1 Order Now
ANGLIA Live EUROPE 4240 1 Order Now

代理商库存报告日期: 2019-09-18

代理商名称

DIGIKEY

库存

603

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

964

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

325

Min.Order

0

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EUROPE Order Now

Newark Element14

库存

126

Min.Order

0

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AMERICA Order Now

ARROW

库存

176

Min.Order

1000

地区

AMERICA Order Now

MOUSER

库存

1153

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1

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WORLDWIDE Order Now

ANGLIA Live

库存

4240

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-18

供货状态

Active

Unit Price (US$)

0.984

数量

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4981AD013TR

封装

SO-20

包装类型

Tape And Reel

Unit Price (US$)

0.984*

Distributor availability ofL4981AD013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 875 1 Order Now
AVNET AMERICA 2000 0 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
ARROW AMERICA 262 1 Order Now
MOUSER WORLDWIDE 2375 1 Order Now
Farnell Element14 EUROPE 1219 1 Order Now
RUTRONIK EUROPE 5000 1000 Order Now

代理商库存报告日期: 2019-09-18

代理商名称

DIGIKEY

库存

875

Min.Order

1

地区

WORLDWIDE Order Now

AVNET

库存

2000

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

2000

Min.Order

1000

地区

WORLDWIDE Order Now

ARROW

库存

262

Min.Order

1

地区

AMERICA Order Now

MOUSER

库存

2375

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1219

Min.Order

1

地区

EUROPE Order Now

RUTRONIK

库存

5000

Min.Order

1000

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-18

供货状态

Active

Unit Price (US$)

0.984

数量

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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产品型号 供货状态 封装 等级规格 符合RoHS级别 材料声明**
L4981AD
Active
SO-20 工业 Ecopack2 (**)
L4981AD013TR
Active
SO-20 工业 Ecopack2 (**)
L4981BD
Active
SO-20 工业 Ecopack2
L4981BD013TR
Active
SO-20 工业 Ecopack2

L4981AD

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

L4981AD013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

L4981BD

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4981BD013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.