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  • The L6566BH is an extremely versatile current-mode primary controller IC, specifically designed for high-performance offline flyback converters running off rectified 3-phase input lines. It is also suited to single-stage, single-switch, input-current-shaping converters (single-stage PFC) for applications that must comply 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 switching frequency in FF mode and the maximum allowed switching frequency in QR mode.
    When FF operation is selected, the ICs work as a standard current-mode controller with a maximum duty cycle limited to 70% min. The oscillator frequency can be modulated to mitigate EMI emissions.
    QR operation, when selected, occurs at heavy load 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 mains 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 ICs enter a controlled burst-mode operation that, along with the built-in, non-dissipative, high-voltage startup circuit and the low quiescent current, helps keep the consumption from the mains low and meet energy saving recommendations.
    An innovative adaptive UVLO helps minimize the issues related to the fluctuations of 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 that is invoked when the transformer saturates or there is a short-circuit of the secondary diode. A latched disable input allows easy implementation of OTP with an external NTC, while an internal 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 complete the features of this device.

    Key Features

    • Selectable multimode operation: fixed frequency or quasi-resonant
    • On-board 840 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
    • Programmable frequency modulation for EMI reduction
    • 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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Technical Documentation

    • Description Version Size Action
      DS6580
      Multimode controller for SMPS
      2.0
      1.23 MB
      PDF
      DS6580

      Multimode controller for SMPS

    • Description Version Size Action
      DT0118
      A Procedure for Restoring Bootloader Functionality to the STNRG388A
      1.0
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      DT0118

      A Procedure for Restoring Bootloader Functionality to the STNRG388A

    • Description Version Size Action
      AN3089
      19 V - 65 W quasi-resonant flyback adapter using L6566B and TSM1014
      2.0
      644.02 KB
      PDF
      AN2749
      40 W wide input range flyback converter demonstration board for digital consumer equipment using the L6566B
      2.2
      1.83 MB
      PDF
      AN3089

      19 V - 65 W quasi-resonant flyback adapter using L6566B and TSM1014

      AN2749

      40 W wide input range flyback converter demonstration board for digital consumer equipment using the L6566B

Presentations & Training Material

    • Description Version Size Action
      Primary side regulation controllers portfolio
      1.1 MB
      PDF

      Primary side regulation controllers portfolio

Publications and Collaterals

    • Description Version Size Action
      fll6566bh0510 1.0
      3 MB
      PDF

      fll6566bh0510

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Power Management Guide 07.2020
      7.12 MB
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      Electric vehicle (EV) ecosystem

      Power Management Guide

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6566BH
Active
SO-16 Industrial Ecopack2
L6566BHTR
Active
SO-16 Industrial Ecopack2

L6566BH

Package:

SO-16

Material Declaration**:

Marketing Status

Active

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6566BHTR

Package:

SO-16

Material Declaration**:

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.

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.

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
L6566BH Available at 7 distributors

Distributor availability ofL6566BH

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 980 1 Order Now
COMPEL EUROPE 50 1 Order Now
RS COMPONENTS EUROPE 400 1 Order Now
FUTURE WORLDWIDE 950 1 Order Now
ARROW EUROPE 2802 0 Order Now
MOUSER WORLDWIDE 903 1 Order Now
RUTRONIK EUROPE 100 50 Order Now

Distributor reported inventory date: 2020-08-04

Distributor Name

DIGIKEY

Stock

980

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

50

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

400

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

950

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

2802

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

903

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

100

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-04

Buy now
Active
EAR99 NEC Tube SO-16 - - PHILIPPINES 0.75 / 1k
L6566BHTR Available at 3 distributors

Distributor availability ofL6566BHTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 235 1 Order Now
Newark Element14 AMERICA 625 0 Order Now
MOUSER WORLDWIDE 4988 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

235

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

625

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4988

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

Get sample Buy now
Active
EAR99 NEC Tape And Reel SO-16 - - PHILIPPINES 0.75 / 1k

L6566BH

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.75 / 1k

Distributor availability ofL6566BH

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 980 1 Order Now
COMPEL EUROPE 50 1 Order Now
RS COMPONENTS EUROPE 400 1 Order Now
FUTURE WORLDWIDE 950 1 Order Now
ARROW EUROPE 2802 0 Order Now
MOUSER WORLDWIDE 903 1 Order Now
RUTRONIK EUROPE 100 50 Order Now

Distributor reported inventory date: 2020-08-04

Distributor Name

DIGIKEY

Stock

980

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

50

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

400

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

950

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

2802

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

903

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

100

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-04

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.75 / 1k

Country of Origin

PHILIPPINES

L6566BHTR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.75 / 1k

Distributor availability ofL6566BHTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 235 1 Order Now
Newark Element14 AMERICA 625 0 Order Now
MOUSER WORLDWIDE 4988 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

235

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

625

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4988

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.75 / 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