Quasi-resonant Controller

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.

Key Features

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

Resources

Technical Documentation

Product Specifications
Description Version Size
DS2176 DS2176: Quasi-resonant SMPS controller 5.3 249 KB
Application Notes
Description Version Size
AN2936 AN2936: 10 W SMPS with HV power MOSFET and the L6565 for three-phase industrial applications 1.1 301 KB
AN2844 AN2844: 15 W wide range SMPS for metering based on ESBT™ STC03DE220HV and L6565 PWM controller 1.1 1 MB
AN1376 AN1376: 25W quasi-resonant flyback converter for set-top box application using the L6565 2.2 1 MB
AN1439 AN1439: 30 W AC-DC adapter with the L6565 quasi-resonant PWM controller 7.0 301 KB
AN1326 AN1326: L6565 quasi-resonant controller 7.3 543 KB
AN2487 AN2487: STEVAL-TSP001V1 power over Ethernet powered device demonstration board 2.1 862 KB
AN2528 AN2528: Very wide input voltage range 6 W SMPS for metering 1.3 855 KB

Presentations & Training Material

Presentations
Description Version Size
Primary side regulation controllers portfolio 1 MB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 05.2016 3 MB
Support & Community


Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L6565D SO-8 Tube Active 0.32 1000 NEC EAR99 MOROCCO MORE INFO DISTRIBUTOR AVAILABILITY
E-L6565N DIP-8 Tube NRND - - NEC EAR99 - MORE INFO No availability reported, please contact our Sales office
L6565N DIP-8 Tube Active 0.32 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
L6565DTR SO-8 Tape And Reel Active 0.32 1000 NEC EAR99 MOROCCO MORE INFO DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6565D ActiveSO-8IndustrialEcopack2 (**) 0 0
E-L6565N NRNDDIP-8IndustrialEcopack1
L6565N ActiveDIP-8IndustrialEcopack2 (**)
L6565DTR ActiveSO-8IndustrialEcopack2 (**) 0 0
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(**) 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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