19 V - 65 W quasi resonant flyback adapter board

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  • The EVL6566B-65W-QR is a demonstration board tailored on specification of a typical hi-end portable computer power supply. The peculiarities of this design are the very high average efficiency of about 90% without synchronous rectification and very low no load consumption of 100mW at 230 Vac. The result is that this converter is compliant to energy star eligibility criteria. The flyback stage implements the new ST dedicated current mode controller L6566B, operating in quasi-resonant mode and detecting the transformer demagnetization by pin ZCD.

    The resistor on pin OSC sets the maximum switching frequency at about 165 kHz.
    Because the maximum switching frequency is imposed, the converter operates in discontinuous conduction mode during light load operation. The L6566B valley skipping function is capable to turn-on the MOSFET in valley switching even in DCM, thus reducing switching losses.
    The Power MOSFET is a standard 800 V, STF7NM80, housed in TO-220FP package, needing just a small heat sink. The transformer is layer type, using a standard ferrite size EER28L, designed according to the EN60950.
    The flyback reflected voltage is ~150 V, providing enough room for the leakage inductance voltage spike with good margin for the reliability of the MOSFET.
    The output rectifiers are two, dual centre tap Schottky diode in parallel, STPS20H100CFP, housed in TO-220FP. They have been selected according to the maximum reverse voltage, forward voltage drop and power dissipation. The snubber damps the oscillation produced by the diode capacitance and the leakage inductance.
    A small LC filter has been added on the output, filtering the high frequency ripple and spikes.
    Thanks to the L6566B valley skipping feature it has been possible to dimension the power transformer parameters optimizing efficiency at different loads achieving an outstanding result even without synchronous rectification.

    Key Features

    • Universal input mains range: 90 264 Vac - frequency 45 ÷ 65Hz
    • Output voltage: 19 V @ 3.42 A continuous operation
    • Mains harmonics: according to EN61000-3-2 Class-D or JEITA-MITI Class-D
    • Stand-by mains consumption: <100 mW @ 230 Vac
    • Average efficiency: better than 89% without synchronous rectification
    • EMI: according to EN55022-Class-B
    • Safety: according to EN60950
    • Dimensions: 58x121 mm, 25 mm components maximum height
    • PCB: single side, 35 μm, CEM-1, mixed PTH/SMT

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EVL6566B-65W-QR L6566BH
Active
- EAR99 - - Check Availability

Distributor availability ofEVL6566B-65W-QR

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Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2 1 Order Now
Farnell Element14 EUROPE 3 1 Order Now
ANGLIA Live EUROPE 1 1 Order Now

Distributor reported inventory date: 2019-12-05

Distributor Name

MOUSER

Stock

2

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

1

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-05

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EVL6566B-65W-QR

Core Product

L6566BH

Marketing Status

Active

Unit Price (US$)

*

Distributor availability ofEVL6566B-65W-QR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2 1 Order Now
Farnell Element14 EUROPE 3 1 Order Now
ANGLIA Live EUROPE 1 1 Order Now

Distributor reported inventory date: 2019-12-05

Distributor Name

MOUSER

Stock

2

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

1

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-05

Unit Price (US$)

-

Quantity

-

ECCN (US)

EAR99

Country of Origin

-

Board production status

-

(*) 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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Technical Documentation

    • Description Version Size Action
      DB1229
      19 V - 65 W quasi resonant flyback adapter board
      1.1
      123.25 KB
      PDF
      DB1229

      19 V - 65 W quasi resonant flyback adapter board

    • Description Version Size Action
      AN3089
      19 V - 65 W quasi-resonant flyback adapter using L6566B and TSM1014
      2.0
      644.02 KB
      PDF
      AN3089

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

Hardware Resources

    • Description Version Size Action
      EVL6566B-65W-QR gerber files 1.0
      235.91 KB
      ZIP

      EVL6566B-65W-QR gerber files

    • Description Version Size Action
      BOM for EVL6566B-65W-QR board 1.0
      23.12 KB
      PDF

      BOM for EVL6566B-65W-QR board

    • Description Version Size Action
      Board schematics for EVL6566B-65W-QR board 1.0
      71.68 KB
      PDF

      Board schematics for EVL6566B-65W-QR board

Publications and Collaterals

    • Description Version Size Action
      eDesignSuite-The smart way to design your application 1.0
      842.88 KB
      PDF

      eDesignSuite-The smart way to design your application

Legal

    • Description Version Size Action
      Evaluation products license agreement 1.6
      74.12 KB
      PDF

      Evaluation products license agreement

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Material Declaration**
EVL6566B-65W-QR
Active
CARD Industrial Ecopack1 -

EVL6566B-65W-QR

Package:

CARD

Material Declaration**:

Marketing Status

Active

Package

CARD

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) 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.

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