Overview
The L6561 is an enhanced Transition Mode Power Factor Corrector (PFC) integrated circuit produced by STMicroelectronics. It is designed to improve upon the previous L6560 model, offering superior performance and compatibility. The L6561 is particularly suited for low to medium power applications, such as lamp ballasts, low-end monitors, and other devices requiring efficient power factor correction.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Supply Current | - | 4 | - | mA |
| Start-Up Current | - | 50 | - | µA |
| Internal Reference Voltage Precision (@ Tj = 25°C) | - | 1% | - | - |
| Output Totem Pole Peak Current (2µs) | - | ±700 | - | mA |
| Junction Temperature Operating Range | -40 | - | 150 | °C |
| Storage Temperature Range | -55 | - | 150 | °C |
| Power Dissipation @Tamb = 50 °C (DIP-8/SO-8) | 0.65/0.45 | - | - | W |
| OVP Triggering Current | 35 | 40 | 45 | µA |
Key Features
- Very Precise Adjustable Output Overvoltage Protection: The L6561 features dynamic and static overvoltage protection to ensure safe operation.
- Micro Power Start-Up Current: With a typical start-up current of 50µA, it allows for simple and low-power start-up circuits.
- Internal Start-Up Timer and Zero Current Detection: These features are crucial for Transition Mode operation, ensuring efficient and accurate power factor correction.
- Disable Function: Allows the device to be shut down, reducing current consumption.
- Internal Reference Voltage with 1% Precision: Ensures accurate voltage regulation.
- Transition Mode Operation: Optimized for low to medium power applications, it helps in achieving high power factor and low harmonic distortion.
- Undervoltage Lockout with Hysteresis: Protects the device from operating under unsafe voltage conditions.
Applications
The L6561 is suitable for various applications requiring efficient power factor correction, including:
- Lamp ballasts
- Low-end monitors and displays
- Power supplies for consumer electronics
- Industrial control systems
- Any device needing low to medium power PFC solutions
Q & A
- What is the typical start-up current of the L6561?
The typical start-up current of the L6561 is 50µA.
- What is the precision of the internal reference voltage at 25°C?
The internal reference voltage has a precision of 1% at 25°C.
- What are the package options available for the L6561?
The L6561 is available in DIP-8 and SO-8 packages.
- What is the operating junction temperature range of the L6561?
The operating junction temperature range is -40°C to 150°C.
- Does the L6561 have overvoltage protection?
Yes, the L6561 features both dynamic and static overvoltage protection.
- What is the purpose of the Zero Current Detection circuit in the L6561?
The Zero Current Detection circuit is crucial for Transition Mode operation, helping to shape the input current in a sinusoidal fashion in-phase with the input voltage.
- Can the L6561 be disabled to reduce power consumption?
Yes, the L6561 has a disable function that allows it to be shut down, reducing its current consumption.
- What is the typical operating supply current of the L6561?
The typical operating supply current is 4mA.
- What are some common applications of the L6561?
Common applications include lamp ballasts, low-end monitors, and power supplies for consumer electronics.
- How does the L6561 achieve high power factor and low harmonic distortion?
The L6561 achieves high power factor and low harmonic distortion through its Transition Mode operation, which shapes the input current to be sinusoidal and in-phase with the input voltage.
