STMicroelectronics L6561 Power Factor Corrector

The L6561 from STMicroelectronics is a versatile Power Factor Correction (PFC) controller IC that is designed to construct a reliable and efficient power factor correction stage. It is particularly suitable for applications that require compliance with the IEC61000-3-2 standard. The L6561 is based on a proprietary "Transition-Mode" control technique, offering a cost-effective solution for power supplies ranging up to 200W.

Key Features

• Transition-mode PFC
• Low power (<200 mW) startup current
• Low (<50 µA) quiescent current
• Direct drive of the power MOSFET
• Source/sink output stage
• Overvoltage protection (OVP)
• Disable function
• 1% (@Tj = 25°C) precision internal reference voltage
• Under-Voltage Lockout (UVLO) with hysteresis
• Very low operating supply current
• High current totem pole output
• Internally trimmed bandgap reference
• Low start-up current (<0.5 mA)

Applications

The L6561 is ideal for a wide range of applications that require improved power factor and reduced total harmonic distortion. These applications include:

• Electronic ballasts for fluorescent lighting
• Adapters and chargers for mobile devices
• Standby power supplies for desktop and notebook computers
• Entry-level ATX power supplies for desktop computers
• Flat TVs and monitors
• Auxiliary supplies for motor control

Product Benefits

The L6561 enhances system reliability and power efficiency, which are critical in high-performance power supply designs. Its transition-mode operation enables reduced power dissipation and smaller heatsink requirements, leading to a more compact design. Additionally, the extensive protection features, including OVP and UVLO, ensure safe operation under abnormal conditions, contributing to the longevity of the end product.