PBMC33260

The MC33260 is a Power Factor Controller (PFC) IC developed to control Power Factor Active Solutions. Most off-line appliances use a bridge rectifier connected to a huge bulk capacitor to draw raw DC voltage from the utility AC line. PBMC33260 process can result in high current spikes and poor power factor ratios, both of which can force the energy manufacturers to expand their distribution network. To control and minimize PBMC33260 and to limit the mains harmonic pollution generated, the IEC1000-3-2 standard was created. All appliance manufacturers must comply to this standard by the year 2001.

Active Solutions of PBMC33260 are the most effective and easily implemented methods to comply with the IEC1000-3-2 legislative requirement. They consist of inserting a Power Factor Correction pre-regulator between the rectifier bridge and bulk capacitor. PBMC33260 interface is in essence a Step-Up converter that outputs a constant voltage while drawing a sinusoidal current from the mains. The MC33260 is equipped with important safety features such as overvoltage, undervoltage and over current protection, and zero currentdetection that increase the reliability of the pre-regulation operation. The MC33260 also detects any direct uncontrolled charges of the output capacitor from the mains which occur when the output voltage is lower than the input voltage (start-up, overload, etc). Furthermore, fewer external components are required for the pre-regulation operation. Most importantly, the MC33260 features an innovative mode called the 'Follower Boost' mode where the voltage output from the PFC pre-converter is not forced to a constant regulation level, but to a value dependent on the AC line amplitude. Use of this new technique leads to a significant reduction in the size of both the power MOSFET and the inductor which ultimately leads to a significant system cost reduction. As an example, in a 200W universal mains application, the MOSFET conduction losses and the inductor ferrite size can be halved. That is why the MC33260 is the controller for a simple, robust and cost effective PFC solution. The MC33260 is the only PFC IC in the industry that works in both the Traditional and Follower Boost modes.