L6561

Overview

The L6561 is a transition mode power factor corrector (PFC) controller from STMicroelectronics, serving as an improved version of the L6560. It features a superior multiplier for wide input voltage ranges (85V to 265V) with excellent THD. Key electrical characteristics include a 1% precision internal reference voltage at 25°C, a typical micro-power start-up current of 50μA, and very low operating supply current of 4mA. The device operates in transition mode and includes a disable function on the ZCD pin for lower standby consumption.

Feature Summary

• Transition mode operation optimized for electronic lamp ballasts, AC-DC adaptors, and SMPS applications.
• Totem pole output stage capable of driving Power MOS or IGBT with source and sink currents of ±400mA.
• Integrated soft output over-voltage protection and on-chip current sense filter eliminating external low-pass filter requirements.
• Disable function on the ZCD pin ensures reduced current consumption in stand-by mode.

Applications

• Electronic lamp ballasts
• AC-DC adaptors
• Switched-mode power supplies (SMPS)
• Wide input voltage range power factor correction circuits

Procurement Notes

Verify component status carefully as the L6561 is listed as NRND (Not Recommended for New Designs). Confirm package availability, as DIP-8 and SO-8 variants exist with different packaging types such as tube or reel. Ensure design compatibility with legacy systems before procurement due to end-of-life implications.

Selection Notes

Select the L6561 for applications requiring transition mode PFC control with high efficiency and low standby power. Consider the L6562 if pin-to-pin compatibility is needed with enhanced gate driver capabilities. Evaluate thermal management requirements based on the specific package type and operating temperature range of -40°C to +150°C.

Part Context

The L6561 belongs to the L6561 series of PMICs under the Power Factor Correction category. It is realized in mixed BCD technology, offering benefits like precise internal references and low quiescent current. It is part of STMicroelectronics' portfolio for power management ICs designed for efficient energy conversion.

Replacement Considerations

The L6562 is a pin-to-pin compatible successor offering improved performance. The L6560 is the predecessor standard version. Verify functional equivalence and package compatibility when substituting these parts.

FAQ

What is the typical start-up current of the L6561?

The typical start-up current is 50μA, which is considered micro-power.

Does the L6561 require an external low-pass filter on the current sense?

No, the device has a very low operating quiescent current and an on-chip filter, eliminating the need for an external low-pass filter on the current sense.