Overview
The L6566BTR is an extremely versatile current-mode primary controller IC designed by STMicroelectronics. It is specifically tailored for high-performance offline flyback converters and can also be used in single-stage single-switch input-current-shaping converters. This IC supports both fixed-frequency (FF) and quasi-resonant (QR) operation, allowing users to select the mode based on application needs. It features an externally programmable oscillator that defines the converter's switching frequency in FF mode and the maximum allowed switching frequency in QR mode.
Key Specifications
| Attribute | Value |
|---|---|
| Package Style | SOIC-16N |
| Mounting Method | Surface Mount |
| Input Voltage | Up to 23 V |
| Quiescent Current | < 3 mA |
| Switching Frequency | 10 kHz ~ 300 kHz |
| Gate Driver Current | -600/+800 mA |
| High-Voltage Start-Up | 700 V |
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 (< 3 mA)
- Adaptive UVLO (Under-Voltage Lockout)
- Line feedforward for constant power capability vs mains voltage
- Pulse-by-pulse OCP (Overcurrent Protection), shutdown on overload (latched or autorestart)
- Transformer saturation detection
- Programmable frequency modulation for EMI reduction
- Latched or autorestart OVP (Overvoltage Protection)
- Brownout protection
- -600/+800 mA totem pole gate driver with active pull-down during UVLO
Applications
- Hi-end AC-DC adapter/charger
- LCD TV/monitor, PDP
- Digital consumer, IT equipment
- Single-stage PFC (Power Factor Correction)
Q & A
- What is the primary function of the L6566BTR IC?
The L6566BTR is a current-mode primary controller IC designed for high-performance offline flyback converters and single-stage single-switch input-current-shaping converters.
- What are the supported operation modes of the L6566BTR?
The L6566BTR supports both fixed-frequency (FF) and quasi-resonant (QR) operation.
- What is the maximum input voltage for the L6566BTR?
The maximum input voltage for the L6566BTR is up to 23 V.
- What is the quiescent current of the L6566BTR?
The quiescent current of the L6566BTR is less than 3 mA.
- What is the range of the switching frequency for the L6566BTR?
The switching frequency range for the L6566BTR is from 10 kHz to 300 kHz.
- What are the key protection features of the L6566BTR?
The key protection features include pulse-by-pulse OCP, transformer saturation detection, programmable frequency modulation for EMI reduction, latched or autorestart OVP, and brownout protection.
- What is the package style of the L6566BTR?
The package style of the L6566BTR is SOIC-16N.
- What are some typical applications of the L6566BTR?
Typical applications include hi-end AC-DC adapters/chargers, LCD TVs/monitors, digital consumer and IT equipment, and single-stage PFC.
- Does the L6566BTR have high-voltage start-up capability?
Yes, the L6566BTR has an on-board 700 V high-voltage start-up capability.
- How does the L6566BTR manage light loads?
The L6566BTR features advanced light load management, including burst-mode operation at no load or very light load conditions.
