Overview
The L6566BHTR, produced by STMicroelectronics, is an extremely versatile current-mode primary controller IC designed for high-performance offline flyback converters. It is particularly suited for applications requiring compliance with regulations such as EN61000-3-2 or JEITA-MITI, especially in single-stage, single-switch, input-current-shaping converters (single-stage PFC). The device supports both fixed-frequency (FF) and quasi-resonant (QR) operation modes, allowing users to select the mode based on application needs.
Key Specifications
| Parameter | Description |
|---|---|
| Package | SO16N |
| Marketing Status | Active |
| Grade | Industrial |
| RoHS Compliance Grade | Ecopack2 |
| High Voltage Startup | 840 V |
| Quiescent Current | < 3 mA |
| Gate Driver | -600/+800 mA totem pole with active pull-down during UVLO |
| Operating Temperature (°C) | -40 to 150 |
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
- Programmable soft-start and leading-edge blanking on the current sense input
- Slope compensation (in FF mode only)
- Shutdown function for externally controlled burst-mode operation or remote ON/OFF control
Applications
- Industrial SMPS
- SMPS running off rectified 3-phase input lines
- Hi-end AC-DC adapters/chargers
- LCD TV/monitor, PDP
- Digital consumer and IT equipment
Q & A
- What are the supported operation modes of the L6566BHTR?
The L6566BHTR supports both fixed-frequency (FF) and quasi-resonant (QR) operation modes.
- What is the high voltage startup capability of the L6566BHTR?
The device has an on-board 840 V high voltage startup capability.
- How does the L6566BHTR manage light loads?
The device features advanced light load management, including controlled burst-mode operation and low quiescent current.
- What protection features are included in the L6566BHTR?
The device includes input undervoltage protection, output OVP, pulse-by-pulse OCP, transformer saturation detection, and brownout protection.
- Can the frequency modulation be programmed for EMI reduction?
Yes, the frequency modulation can be programmed for EMI reduction.
- What is the package type of the L6566BHTR?
The device is packaged in an SO16N package.
- What is the operating temperature range of the L6566BHTR?
The operating temperature range is from -40°C to 150°C.
- Does the L6566BHTR support remote ON/OFF control?
Yes, the device supports remote ON/OFF control through a shutdown function.
- How does the L6566BHTR handle transformer demagnetization?
The device uses a transformer demagnetization sensing input to trigger MOSFET turn-on in QR mode.
- Is slope compensation available in both operation modes?
No, slope compensation is available only in fixed-frequency (FF) mode.
