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  • The L6566A is an extremely versatile current-mode primary controller IC specifically designed for high-performance offline flyback converters operated from front-end power factor correction (PFC) stages in applications in compliance with EN61000-3-2 or JEITA-MITI regulations.

    Both fixed-frequency (FF) and quasi-resonant (QR) operation are supported. The user can choose either of the two depending on application needs.
    The device features an externally programmable oscillator; it defines the converter's switching frequency in FF mode and the maximum allowed switching frequency in QR mode.
    When FF operation is selected, the IC works like a standard current-mode controller with a maximum duty cycle limited to 70% (min.).
    QR operation, when selected, occurs and is achieved through a transformer demagnetization sensing input that triggers MOSFET turn-on. Under some conditions, ZVS (zero-voltage switching) can be achieved. The converter's power capability rise with the input voltage is compensated by line voltage feedforward. At medium and light load, as the QR operating frequency equals the oscillator frequency, a function (valley skipping) is activated to prevent further frequency rise and keep the operation as close to ZVS as possible.
    With either FF or QR operation, at very light load the IC enters a controlled burst-mode operation that, along with the built-in non-dissipative high-voltage startup circuit and a reduced quiescent current, helps keep the consumption from the mains low and meet energy saving recommendations.
    To allow the meeting of energy saving recommendations in two-stage power-factor-corrected systems as well, the L6566A provides an interface with the PFC controller that enables the re-regulator to be turned off at light load.
    An innovative adaptive UVLO helps minimize the issues related to fluctuations in the self-supply voltage due to transformer parasites.
    The protection functions included in this device are: not-latched input undervoltage (brownout), output OVP (auto-restart or latch-mode selectable), a first-level OCP with delayed shutdown to protect the system during overload or short-circuit conditions (auto-restart or latch-mode selectable), and a second-level OCP which is invoked when the transformer saturates or the secondary diode fails short. A latched disable input allows easy implementation of OTP with an external NTC, while an internal thermal shutdown prevents IC overheating.
    Programmable soft-start, leading-edge blanking on the current sense input for greater noise immunity, slope compensation (in FF mode only), and a shutdown function for externally controlled burst-mode operation or remote ON/OFF control are all features of this device.

    Key Features

    • Selectable multi-mode operation: fixed frequency or quasi-resonant
    • Onboard 700 V high-voltage startup
    • Advanced light load management
    • Low quiescent current (< 3 mA)
    • Adaptive UVLO
    • Line feedforward for constant power capability vs. mains voltage
    • Pulse-by-pulse OCP, shutdown on overload (latched or auto-restart)
    • Transformer saturation detection
    • Switched supply rail for PFC controller
    • Latched or auto-restart OVP
    • Brownout protection
    • -600/+800 mA totem pole gate-driver with active pull-down during UVLO
    • SO16N package

Circuit Diagram

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    • Part number
      Status
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      Type
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      EVL6566A-75WADP

      Active

      19 V - 75 W laptop adapter with tracking boost PFC pre-regulator, using the L6563 and the L6566A

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      STEVAL-ISA149V1

      Active

      19 V - 75 W SMPS compliant with latest Energy Star criteria using the L6563 and the L6566A

      PSU and Converter Solution Eval Boards --
      EVL6566A-75WADP

      Description:

      19 V - 75 W laptop adapter with tracking boost PFC pre-regulator, using the L6563 and the L6566A
      EVL6566A-75WES4

      Description:

      19 V - 75 W SMPS compliant with latest Energy Star criteria using the L6563 and the L6566A
      STEVAL-ISA149V1

      Description:

      19 V - 75 W SMPS compliant with latest Energy Star criteria using the L6563 and the L6566A

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STMicroelectronics - L6566A

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6566A
Active
SO-16 Industrial Ecopack2
L6566ATR
Active
SO-16 Industrial Ecopack2

L6566A

Package:

SO-16

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6566ATR

Package:

SO-16

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16

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

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L6566ATR Available at 2 distributors

Distributor availability ofL6566ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 100 1 Order Now
ARROW AMERICA 10000 2500 Order Now

Distributor reported inventory date: 2020-10-29

Distributor Name

DIGIKEY

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

10000

Min.Order

2500

Region

AMERICA Order Now

Distributor reported inventory date: 2020-10-29

Active
EAR99 NEC Tape And Reel SO-16 - - PHILIPPINES 0.6816 / 1k
L6566A Available at 1 distributors

Distributor availability ofL6566A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 510 1 Order Now

Distributor reported inventory date: 2020-10-29

Distributor Name

DIGIKEY

Stock

510

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-29

Active
EAR99 NEC Tube SO-16 - - PHILIPPINES 0.6816 / 1k

L6566ATR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.6816 / 1k

Distributor availability ofL6566ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 100 1 Order Now
ARROW AMERICA 10000 2500 Order Now

Distributor reported inventory date: 2020-10-29

Distributor Name

DIGIKEY

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

10000

Min.Order

2500

Region

AMERICA Order Now

Distributor reported inventory date: 2020-10-29

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.6816 / 1k

Country of Origin

PHILIPPINES

L6566A

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.6816 / 1k

Distributor availability ofL6566A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 510 1 Order Now

Distributor reported inventory date: 2020-10-29

Distributor Name

DIGIKEY

Stock

510

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-29

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.6816 / 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