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L6565

Quasi-resonant Controller
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The L6565 is a current-mode primary controller IC, specifically designed to build offline Quasi-resonant ZVS (Zero Voltage Switching at switch turn-on) flyback converters.

Quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers MOSFET's turn-on.

Converter's power capability variations with the mains voltage are compensated by line voltage feedforward. At light load the device features a special function that automatically lowers the operating frequency still maintaining the operation as close to ZVS as possible. In addition to very low start-up and quiescent currents, this feature helps keep low the consumption from the mains at light load and be Blue Angel and Energy Star compliant.

The IC includes also a disable function, an on-chip filter on current sense, an error amplifier with a precise reference voltage for primary regulation and an effective two-level overcurrent protection.

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Errata Sheet
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Datasheet

Key Features

  • QUASI-RESONANT (QR) ZERO-VOLTAGE-SWITCHING (ZVS) TOPOLOGY
  • LINE FEED FORWARD TO DELIVER CONSTANT POWER vs. MAINS CHANGE
  • FREQUENCY FOLDBACK FOR OPTIMUM STANDBY EFFICIENCY
  • PULSE-BY-PULSE & HICCUP-MODE OCP
  • ULTRA-LOW START-UP (< 70µA) AND QUIESCENT CURRENT (< 3.5mA)
  • DISABLE FUNCTION (ON/OFF CONTROL)
  • 1% PRECISION (@ Tj = 25˚C) INTERNAL REFERENCE VOLTAGE
  • ±400mA TOTEM POLE GATE DRIVER WITH UVLO PULL-DOWN
  • BLUE ANGEL, ENERGY STAR, ENERGY 2000 COMPLIANT
  • TV/MONITOR SMPS
  • AC-DC ADAPTERS/CHARGERS
  • DIGITAL CONSUMER
  • PRINTERS, FAX MACHINES, PHOTOCOPIERS AND SCANNERS

Circuit Diagram

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS2176: Quasi-resonant SMPS controller
5.3 250 KB
pdf
DB0530: 6 W 3-phase SMPS for metering evaluation board based on ESBT®
1.2 77 KB
pdf
DB0533: 30 W AC-DC adapter based on the L6565
1.2 94 KB

Application Notes

Description Version Size
pdf
AN1326: L6565 quasi-resonant controller
7.3 543 KB
pdf
AN1376: 25W quasi-resonant flyback converter for set-top box application using the L6565
2.2 1,768 KB
pdf
AN1439: 30 W AC-DC adapter with the L6565 quasi-resonant PWM controller
7.0 307 KB
pdf
AN1657: SMPS for CRT monitors with the L6565
1.3 161 KB
pdf
AN1729: L6565-based low cost SMPS for TV with less then 1W standby consumption
1.2 197 KB
pdf
AN2487: STEVAL-TSP001V1 power over Ethernet powered device demonstration board
2.1 862 KB
pdf
AN2528: Very wide input voltage range 6 W SMPS for metering
1.3 855 KB
pdf
AN2844: 15 W wide range SMPS for metering based on ESBT™ STC03DE220HV and L6565 PWM controller
1.1 1,479 KB
pdf
AN2936: 10 W SMPS with HV power MOSFET and the L6565 for three-phase industrial applications
1.1 301 KB

User Manual

Description Version Size
pdf
UM0584: STEVAL-ISA031V1: 40 W SMPS with HV MOSFET and L6565 for three-phase industrial applications
1.1 398 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-ISA019V3 80 W ESBT quasi-resonant wide-range SMPS demonstration board based on the L6565 for 3-phase applications
STEVAL-ISA030V1 6 W 3-phase SMPS for metering evaluation board based on ESBT®
STEVAL-ISC001V1 30 W AC-DC adapter based on the L6565

Publications and Collaterals

Conference Paper

Description Version Size
pdf
ANALYSIS OF MULTI-PHASE LLC RESONANT CONVERTERS
1.0.0 418 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
E-L6565NNRNDDIP-8Tube_-No availability reported, please contact our Sales officeEcopack1PDF
XML
L6565DActiveSO-8Tube_-.32Distributor reported inventory date: 2014-07-22
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA1470
ARROWOrder NowEUROPE36720
Farnell Element14Order NowEUROPE2101
RS COMPONENTSOrder NowEUROPE5842
MOUSEROrder NowWORLDWIDE34471
Ecopack2 (**)PDF
XML
L6565DTRActiveSO-8Tape And Reel_-.32Distributor reported inventory date: 2014-07-22
Distributor NameRegionStockMin. order
RS COMPONENTSOrder NowEUROPE24505
RUTRONIKOrder NowEUROPE25002500
DIGIKEYOrder NowWORLDWIDE5431
MOUSEROrder NowWORLDWIDE24171
Ecopack2 (**)PDF
XML
L6565NActiveDIP-8Tube_-.32Distributor reported inventory date: 2014-07-22
Distributor NameRegionStockMin. order
ARROWOrder NowEUROPE18000
DIGIKEYOrder NowWORLDWIDE19581
MOUSEROrder NowWORLDWIDE3601
Ecopack2 (**)PDF
XML

(*) 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
(**) 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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