MC33260

• Standard Constant Output Voltage or "Follower Boost" Mode
• Switch Mode Operation: Voltage Mode
• Latching PWM for CyclebyCycle OnTime Control
• Constant OnTime Operation That Saves the Use of an Extra Multiplier
• Totem Pole Output Gate Drive
• Undervoltage Lockout with Hysteresis
• Low StartUp and Operating Current
• Improved Regulation Block Dynamic Behavior
• Synchronization Capability
• Internally Trimmed Reference Current Source
• Overvoltage Protection: Output Overvoltage Detection
• Undervoltage Protection: Protection Against Open Loop
• Effective Zero Current Detection
• Accurate and Adjustable Maximum OnTime Limitation
• Overcurrent Protection
• ESD Protection on Each Pin

The MC33260 is a controller for Power Factor Correction preconverters meeting international standard requirements in electronic ballast and offline power conversion applications. Designed to drive a free frequency discontinuous mode, it can also be synchronized and in any case, it features very effective protections that ensure a safe and reliable operation.

This circuit is also optimized to offer extremely compact and cost effective PFC solutions. While it requires a minimum number of external components, the MC33260 can control the follower boost operation that is an innovative mode allowing a drastic size reduction of both the inductor and the power switch. Ultimately, the solution system cost is significantly lowered.

Also able to function in a traditional way (constant output voltage regulation level), any intermediary solutions can be easily implemented. This flexibility makes it ideal to optimally cope with a wide range of applications.

The MC33260 has the following features including (1)Standard Constant Output Voltage or "Follower Boost" Mode;(2)Switch Mode Operation: Voltage Mode;(3)WUndervoltage Lockout with Hysteresis;(4)Internally Trimmed Reference Current Source;(5)Improved Regulation Block Dynamic Behavior;(6)Latching PWM for CyclebyCycle OnTime Control.

The MC33260 is a controller for Power Factor Correction preconverters meeting international standard requirements in electronic ballast and offline power conversion applications.Designed to drive a free frequency discontinuous mode, it can also be synchronized and in any case, it features very effective protections that ensure a safe and reliable operation.This circuit is also optimized to offer extremely compact and cost effective PFC solutions. While it requires a minimum number of external components, the MC33260 can control the follower boost operation that is an innovative mode allowing a drastic size reduction of both the inductor and the power switch. Ultimately, the solution system cost is significantly lowered.Also able to function in a traditional way (constant output voltage regulation level), any intermediary solutions can be easily implemented. This flexibility makes it ideal to optimally cope with a wide range of applications.

The MC33260 is optimized to just as well drive a free running as a synchronized discontinuous voltage mode.MC33260 also features valuable protections (overvoltage and undervoltage protection, overcurrent limitation, ...) that make the PFC preregulator very safe and reliable while requiring very few external components. In particular, MC33260 is able to safely face any uncontrolled direct charges of the output capacitor from the mains which occur when the output voltage is lower than the input voltage (startup, overload, ...).This technique results in a high harmonic content and in poor power factor ratios. In effect, the simple rectification technique draws power from the mains when the instantaneous ac voltage exceeds the capacitor voltage. This occurs near the line voltage peak and results in a high charge current spike. Consequently, a poor power factor (in the range of 0.5 0.7) is generated, resulting in an apparent input power that is much higher than the real power.