L4981

Active

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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Quality and Reliability

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.

Sample & Buy

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ECCN (US)
ECCN (EU)
Packing Type
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Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L4981BD Available at 5 distributors

Distributor availability ofL4981BD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 975 1 Order Now
RS COMPONENTS EUROPE 182 1 Order Now
ARROW EUROPE 142 0 Order Now
MOUSER WORLDWIDE 98 1 Order Now
Farnell Element14 EUROPE 56 1 Order Now

Distributor reported inventory date: 2020-10-25

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DIGIKEY

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975

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1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

182

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1

Region

EUROPE Order Now

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Stock

142

Min.Order

0

Region

EUROPE Order Now

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Stock

98

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1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

56

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-25

Buy Direct
Active
EAR99 NEC Tube SO-20 - - PHILIPPINES 1.125 / 1k
L4981BD013TR Available at 5 distributors

Distributor availability ofL4981BD013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2970 1 Order Now
ARROW EUROPE 5000 0 Order Now
Newark Element14 AMERICA 5 0 Order Now
MOUSER WORLDWIDE 1975 1 Order Now
Farnell Element14 EUROPE 271 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

2970

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

5

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1975

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

271

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-25

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO-20 - - PHILIPPINES 1.125 / 1k
L4981AD Available at 5 distributors

Distributor availability ofL4981AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 116 1 Order Now
RS COMPONENTS EUROPE 962 1 Order Now
ARROW EUROPE 44 0 Order Now
Newark Element14 AMERICA 29 0 Order Now
MOUSER WORLDWIDE 1054 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

116

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

962

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

44

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

29

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1054

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-25

Buy Direct
Active
EAR99 NEC Tube SO-20 - - PHILIPPINES 0.984 / 1k
L4981AD013TR Available at 6 distributors

Distributor availability ofL4981AD013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1673 1 Order Now
COMPEL EUROPE 3592 1 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
ARROW AMERICA 110 1 Order Now
MOUSER WORLDWIDE 1632 1 Order Now
Farnell Element14 EUROPE 584 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

1673

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3592

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

2000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

110

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1632

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

584

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-25

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO-20 - - PHILIPPINES 0.984 / 1k

L4981BD

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.125 / 1k

Distributor availability ofL4981BD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 975 1 Order Now
RS COMPONENTS EUROPE 182 1 Order Now
ARROW EUROPE 142 0 Order Now
MOUSER WORLDWIDE 98 1 Order Now
Farnell Element14 EUROPE 56 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

975

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

182

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

142

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

98

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

56

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-25

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.125 / 1k

Country of Origin

PHILIPPINES

L4981BD013TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.125 / 1k

Distributor availability ofL4981BD013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2970 1 Order Now
ARROW EUROPE 5000 0 Order Now
Newark Element14 AMERICA 5 0 Order Now
MOUSER WORLDWIDE 1975 1 Order Now
Farnell Element14 EUROPE 271 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

2970

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

5

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1975

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

271

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-25

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.125 / 1k

Country of Origin

PHILIPPINES

L4981AD

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.984 / 1k

Distributor availability ofL4981AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 116 1 Order Now
RS COMPONENTS EUROPE 962 1 Order Now
ARROW EUROPE 44 0 Order Now
Newark Element14 AMERICA 29 0 Order Now
MOUSER WORLDWIDE 1054 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

116

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

962

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

44

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

29

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1054

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-25

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.984 / 1k

Country of Origin

PHILIPPINES

L4981AD013TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.984 / 1k

Distributor availability ofL4981AD013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1673 1 Order Now
COMPEL EUROPE 3592 1 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
ARROW AMERICA 110 1 Order Now
MOUSER WORLDWIDE 1632 1 Order Now
Farnell Element14 EUROPE 584 1 Order Now

Distributor reported inventory date: 2020-10-25

Distributor Name

DIGIKEY

Stock

1673

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3592

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

2000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

110

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1632

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

584

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-25

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.984 / 1k

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