Multi-mode controller for SMPS

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

电路原理图

0 下载

circuit_diagram_16610_thumbnail.png

设计

技术文档

产品规格
Description Version Size
DS6580 DS6580: Multimode controller for SMPS 2.0 1 MB

演示和培训资料

简报
Description Version Size
Primary side regulation controllers portfolio 1 MB

出版刊物和宣传资料

宣传册
Description Version Size
fll6566bh0510 1.0 2 MB
手册
Description Version Size
Brochure Power management guide 05.2016 7 MB

工具和软件

评估工具
解决方案评估工具
eDesignSuite 支持和社区



样片和购买

型号 Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L6566BH SO-16 Tube Active - - NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
L6566BHTR SO-16 Tape And Reel Active - - NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
test

(*) 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

质量和可靠性

型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6566BH ActiveSO-16IndustrialEcopack2
L6566BHTR ActiveSO-16IndustrialEcopack2
test

(**) 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.

×