Overview
The L6565DTR, produced by STMicroelectronics, is a current-mode primary controller IC designed for building offline Quasi-resonant ZVS (Zero Voltage Switching at switch turn-on) flyback converters. This IC is optimized for high efficiency and compliance with various energy standards. It features quasi-resonant operation achieved through a transformer demagnetization sensing input that triggers the MOSFET's turn-on. The device includes line voltage feedforward to maintain constant power delivery despite mains voltage changes and a frequency foldback mechanism to optimize standby efficiency. It also boasts ultra-low start-up and quiescent currents, making it compliant with Blue Angel, Energy Star, and Energy 2000 standards.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (Vcc) | 10.3 | - | 18 | V |
| Turn-on Threshold (VccOn) | 12.5 | 13.5 | 14.5 | V |
| Turn-off Threshold (VccOff) | 8.7 | 9.5 | 10.3 | V |
| Hysteresis (Hys) | 3.65 | 4 | 4.3 | V |
| Start-up Current (Istart-up) | 45 | 70 | - | µA |
| Quiescent Current (Iq) | 2.3 | 3.5 | - | mA |
| Operating Temperature (Tj) | -40 | - | 150 | °C |
| Storage Temperature (Tstg) | -55 | - | 150 | °C |
| Gate Driver Peak Current (IGD) | - | - | ±700 | mA |
| Zero Current Detector Input (IZCD) | -10 | - | 50 | mA |
Key Features
- Quasi-resonant (QR) Zero-Voltage-Switching (ZVS) topology for high efficiency
- Line voltage feedforward to deliver constant power vs. mains change
- Frequency foldback for optimum standby efficiency
- Ultra-low start-up current (< 70µA) and quiescent current (< 3.5mA)
- Disable function (ON/OFF control)
- 1% precision internal reference voltage (@ Tj = 25°C)
- ±400mA totem pole gate driver with UVLO pull-down
- Pulse-by-pulse and hiccup-mode overcurrent protection (OCP)
- Blue Angel, Energy Star, and Energy 2000 compliant
Applications
- TV/Monitor SMPS
- AC-DC adapters/chargers
- Digital consumer electronics
- Printers, fax machines, photocopiers, and scanners
- Industrial and personal electronics
Q & A
- What is the primary function of the L6565DTR IC?
The L6565DTR is a current-mode primary controller IC designed to build offline Quasi-resonant ZVS flyback converters.
- How does the L6565DTR achieve quasi-resonant operation?
Quasi-resonant operation is achieved through a transformer demagnetization sensing input that triggers the MOSFET's turn-on.
- What is the purpose of the line voltage feedforward feature?
The line voltage feedforward feature compensates for power capability variations with mains voltage changes, ensuring constant power delivery.
- What are the benefits of the frequency foldback mechanism?
The frequency foldback mechanism optimizes standby efficiency by automatically lowering the operating frequency at light loads.
- What are the typical start-up and quiescent currents of the L6565DTR?
The typical start-up current is less than 70µA, and the quiescent current is less than 3.5mA.
- Does the L6565DTR have overcurrent protection?
Yes, it features pulse-by-pulse and hiccup-mode overcurrent protection (OCP).
- Is the L6565DTR compliant with any energy efficiency standards?
Yes, it is compliant with Blue Angel, Energy Star, and Energy 2000 standards.
- What is the operating temperature range of the L6565DTR?
The operating temperature range is from -40°C to 150°C.
- What is the storage temperature range of the L6565DTR?
The storage temperature range is from -55°C to 150°C.
- What are some common applications of the L6565DTR?
Common applications include TV/Monitor SMPS, AC-DC adapters/chargers, digital consumer electronics, and printers, fax machines, photocopiers, and scanners.
