STMicroelectronics L6566B Datasheet

Below you will find brief information for Multi-mode controller L6566B. This is a versatile peak-current-mode PWM controller for offline flyback converters. It supports both fixed-frequency (FF) and quasi-resonant (QR) operation, selectable with pin MODE/SC. This device is ideal for high-performance applications, such as hi-end AC-DC adapter/charger, LCD TV/monitor, PDP and single-stage PFC for single-switch input-current-shaping converters, featuring a low quiescent current and advanced light load management.

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Multi-mode controller L6566B Datasheet | Manualzz

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Key features

  • Selectable multi-mode operation: fixed frequency or quasi-resonant
  • On-board 700 V high-voltage start-up
  • Advanced light load management
  • Low quiescent current (< 3mA)
  • Adaptive UVLO
  • -600/+800 mA totem pole gate driver with active pull-down during UVLO
  • SO16N package

Frequently asked questions

The L6566B is a multi-mode controller designed for use in offline flyback converters, particularly in applications requiring high performance, such as hi-end AC-DC adapter/charger, LCD TV/monitor, PDP and single-stage PFC converters.

The L6566B offers a range of features including selectable multi-mode operation (fixed frequency or quasi-resonant), on-board 700 V high-voltage start-up, advanced light load management, low quiescent current (< 3 mA), adaptive UVLO, and a high-current totem pole gate driver with active pull-down during UVLO.

The L6566B provides various protection functions such as 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, and a second-level OCP that is invoked when the transformer saturates or the secondary diode fails short. Additionally, it includes a latched disable input, allowing easy implementation of OTP with an external NTC, and an internal thermal shutdown to prevent IC overheating.
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