L4981

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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.

    Key Features

    • 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

Circuit Diagram

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EAR99 PHILIPPINES 0.984 / 1k Check Availability

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DIGIKEY WORLDWIDE 109 1 Order Now
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1000

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L4981BD

Package

SO-20

Packing Type

Tube

Budgetary Price (US$)*/Qty

1.125 / 1k

Distributor availability ofL4981BD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1068 1 Order Now
RS COMPONENTS EUROPE 54 1 Order Now
ARROW EUROPE 122 0 Order Now
MOUSER WORLDWIDE 225 1 Order Now
RUTRONIK EUROPE 120 40 Order Now

Distributor reported inventory date: 2020-05-27

Distributor Name

DIGIKEY

Stock

1068

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

54

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

122

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

225

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

120

Min.Order

40

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-27

Marketing Status

Active

Budgetary Price (US$)* / Qty

1.125 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L4981BD013TR

Package

SO-20

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

1.125 / 1k

Distributor availability ofL4981BD013TR

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 1000 0 Order Now
Newark Element14 AMERICA 5 0 Order Now
MOUSER WORLDWIDE 1000 1 Order Now
Farnell Element14 EUROPE 417 1 Order Now

Distributor reported inventory date: 2020-05-27

Distributor Name

ARROW

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1000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

5

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0

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AMERICA Order Now

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Stock

1000

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1

Region

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Farnell Element14

Stock

417

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-27

Marketing Status

Active

Budgetary Price (US$)* / Qty

1.125 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L4981AD

Package

SO-20

Packing Type

Tube

Budgetary Price (US$)*/Qty

0.984 / 1k

Distributor availability ofL4981AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 347 1 Order Now
RS COMPONENTS EUROPE 394 1 Order Now
ARROW EUROPE 44 0 Order Now
Newark Element14 AMERICA 54 0 Order Now
MOUSER WORLDWIDE 1145 1 Order Now
ANGLIA Live EUROPE 3355 1 Order Now

Distributor reported inventory date: 2020-05-27

Distributor Name

DIGIKEY

Stock

347

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

394

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

44

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

54

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1145

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

3355

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-27

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.984 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L4981AD013TR

Package

SO-20

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.984 / 1k

Distributor availability ofL4981AD013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 109 1 Order Now
COMPEL EUROPE 3775 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
ARROW AMERICA 2210 1 Order Now
RUTRONIK EUROPE 1000 1000 Order Now

Distributor reported inventory date: 2020-05-27

Distributor Name

DIGIKEY

Stock

109

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3775

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

2210

Min.Order

1

Region

AMERICA Order Now

RUTRONIK

Stock

1000

Min.Order

1000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-27

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.984 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

(*) 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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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS0071
      Power factor corrector
      6.2
      2.56 MB
      PDF
      DS0071

      Power factor corrector

    • Description Version Size Action
      AN828
      1500W - 440V power factor corrector preregulator
      3.3
      34.98 KB
      PDF
      AN1606
      A "bridgeless PFC configuration" based on L4981 PFC controller
      3.2
      283.18 KB
      PDF
      AN827
      A 500W high power factor with the L4981A continuous mode IC
      1.2
      242.86 KB
      PDF
      AN2649
      A power factor corrector with MDmesh™ II and SiC diode
      2.0
      759.83 KB
      PDF
      AN510
      Circuits for power factor correction with regards to mains filtering
      1.3
      418.24 KB
      PDF
      AN628
      Designing a high power factor switching preregulator with the L4981 continuous mode
      9.4
      778.91 KB
      PDF
      AN833
      FREQUENCY MODULATION ON L4981B
      1.1
      27.86 KB
      PDF
      AN832
      L4981A synchronization
      1.2
      28.56 KB
      PDF
      AN829
      Semiconductor kit for power factor corrector
      3.3
      96.57 KB
      PDF
      AN828

      1500W - 440V power factor corrector preregulator

      AN1606

      A "bridgeless PFC configuration" based on L4981 PFC controller

      AN827

      A 500W high power factor with the L4981A continuous mode IC

      AN2649

      A power factor corrector with MDmesh™ II and SiC diode

      AN510

      Circuits for power factor correction with regards to mains filtering

      AN628

      Designing a high power factor switching preregulator with the L4981 continuous mode

      AN833

      FREQUENCY MODULATION ON L4981B

      AN832

      L4981A synchronization

      AN829

      Semiconductor kit for power factor corrector

Presentations & Training Material

    • Description Version Size Action
      Power Factor Corrector controllers portfolio
      1.22 MB
      PDF

      Power Factor Corrector controllers portfolio

Publications and Collaterals

    • Description Version Size Action
      Power Management Guide 06.2019
      4.89 MB
      PDF

      Power Management Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4981AD
Active
SO-20 Industrial Ecopack2
L4981AD013TR
Active
SO-20 Industrial Ecopack2
L4981BD
Active
SO-20 Industrial Ecopack2
L4981BD013TR
Active
SO-20 Industrial 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.