New PFC boost controllers from STMicro saves a lot of external circuitry

Maintaining power factor at 1 or closest to 1 is important in lot of inductive and capacitive loaded high-power switching power supplies or any such power systems. There is also regulations such as IEC 61000-3-2, IEC 61010-1 or IEC 62368-1, which demands use of power factor correction (PFC) system at power supply input end. The PFC boost converter provides continuous current while maintaining lowest phase difference with voltage. There are good number of vendors supplying power factor correction boost controllers in the market, added to this list is new STMicroelectronics' L4985A/B and L4986A/B power-factor correction (PFC) boost controllers chips where they have on chip 800V startup circuitry and other features. This built-in feature saves from the use of additional circuit. It also has internal logic to discharge stored energy from the input capacitors when input AC line is switched off. This particular feature saves power what used to be dissipated by a traditional discharge resistor and also meets safety regulations such as IEC 61010-1 or IEC 62368-1. SO-8 packaged L4985A/B and SSOP-10 packaged L4986A/B power-factor correction (PFC) boost controllers suggested for multiple applications such as desktop PCs, servers, game consoles, and televisions, industrial and medical switched-mode power supplies (SMPS), and e-scooter chargers. These devices can be used as PFC...