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  • The L4984D is a current-mode PFC controller operating with line-modulated fixed-off-time (LM-FOT) control. A proprietary LM-FOT modulator allows fixed-frequency operation for boost PFC converters as long as they are operated in CCM (continuous conduction mode).

    The chip comes in a 10-pin SO package and offers a low-cost solution for CCM-operated boost PFC pre-regulators in EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans from few hundred W to 1 KW and above.
    The highly linear multiplier includes a special circuit, able to reduce the crossover distortion of the AC input current, that allows wide-range-mains operation with a reasonably low THD, even over a large load range.
    The output voltage is controlled by means of a voltage-mode error amplifier and an accurate (1% at Tj = 25 °C) internal voltage reference. Loop stability is optimized by the voltage feedforward function (1/V2correction), which in this IC uses a proprietary technique that also significantly improves line transient response in the case of mains drops and surges (“bi-directional”).
    The device features low consumption and includes a disable function suitable for IC remote on/off. These features allow use in applications which also comply with the latest energy saving requirements (Blue Angel, ENERGY STAR, Energy 2000, etc.).
    In addition to overvoltage protection able to keep the output voltage under control during transient conditions, the IC is also provided with protection against feedback loop failures or erroneous settings. Other onboard protection functions allow that brownout conditions and boost inductor saturation can be safely handled. Soft-start limits peak current and extends off-time to prevent flux runaway in the initial cycles.
    The totem pole output stage, capable of 600 mA source and 800 mA sink current, is suitable for big MOSFETs or IGBT drive.

    Key Features

    • Line-modulated fixed-off-time (LM-FOT) control of CCM-operated PFC pre-regulators
    • Proprietary LM-FOT modulator for nearly fixed-frequency operation
    • Proprietary multiplier design for minimum THD of AC input current
    • Fast “bi-directional” input voltage feedforward (1/V2correction)
    • Accurate adjustable output overvoltage protection
    • Protection against feedback loop failure (latched shutdown)
    • Inductor saturation protection
    • AC brownout detection
    • Digital leading-edge blanking on current sense
    • Soft-start
    • 1% (at Tj = 25 °C) internal reference voltage
    • - 600 / + 800 mA totem pole gate driver with active pull-down during UVLO and voltage clamp
    • SSOP10 package

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Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
L4984DTR SSOP 10 Tape And Reel
Active
0.836 1000 EAR99 CHINA Check Availability

Distributor availability ofL4984DTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5832 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 8000 0 Order Now
MOUSER WORLDWIDE 8857 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

5832

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

8000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

8857

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

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L4984D SSOP 10 Tube
Active
0.836 1000 EAR99 MOROCCO Check Availability

Distributor availability ofL4984D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4027 1 Order Now
ARROW EUROPE 990 0 Order Now
Newark Element14 AMERICA 500 0 Order Now
MOUSER WORLDWIDE 1928 1 Order Now
Farnell Element14 EUROPE 1356 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

4027

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

990

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

500

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1928

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1356

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-22

Buy now

L4984DTR

Package

SSOP 10

Packing Type

Tape And Reel

Unit Price (US$)

0.836*

Distributor availability ofL4984DTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5832 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 8000 0 Order Now
MOUSER WORLDWIDE 8857 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

5832

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

8000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

8857

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Marketing Status

Active

Unit Price (US$)

0.836

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

L4984D

Package

SSOP 10

Packing Type

Tube

Unit Price (US$)

0.836*

Distributor availability ofL4984D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4027 1 Order Now
ARROW EUROPE 990 0 Order Now
Newark Element14 AMERICA 500 0 Order Now
MOUSER WORLDWIDE 1928 1 Order Now
Farnell Element14 EUROPE 1356 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

4027

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

990

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

500

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1928

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1356

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-22

Marketing Status

Active

Unit Price (US$)

0.836

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MOROCCO

(*) 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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Evaluation Tools

    • Part Number

      12V - 400W SMPS for Adapter, Desktop and AIO using L4984D, L6699 and SRK2000A

      350 W CCM PFC pre-regulator demonstration board based on the L4984D

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS9596
      CCM PFC controller
      1.0
      4.99 MB
      PDF
      DS9596

      CCM PFC controller

    • Description Version Size Action
      AN4149
      Designing a CCM PFC pre-regulator based on the L4984D
      2.0
      2.7 MB
      PDF
      AN4163
      EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D
      2.0
      3.77 MB
      PDF
      AN4149

      Designing a CCM PFC pre-regulator based on the L4984D

      AN4163

      EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D

    • Description Version Size Action
      AN4163
      EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D
      2.0
      3.77 MB
      PDF
      AN4163

      EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D

Presentations & Training Material

    • Description Version Size Action
      EuP Lot 6 Tier2 Ecodesign requirements for Standby
      2.2 MB
      PDF
      L4984D CCM PFC Controller 1.0
      322.33 KB
      PDF
      Power Factor Corrector controllers portfolio
      1.22 MB
      PDF

      EuP Lot 6 Tier2 Ecodesign requirements for Standby

      L4984D CCM PFC Controller

      Power Factor Corrector controllers portfolio

Publications and Collaterals

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF

      Brochure Power management guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4984D
Active
SSOP 10 Industrial Ecopack2
L4984DTR
Active
SSOP 10 Industrial Ecopack2

L4984D

Package:

SSOP 10

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SSOP 10

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4984DTR

Package:

SSOP 10

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SSOP 10

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.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.