ONSEMI NCP1618JDR2G PFC Controller, 9.5 V to 35 V Supply, 65 kHz, NSOIC-9

NCP1618 is an innovative high-voltage multimode power factor controller. The circuit naturally transitions from one operation mode to another depending the switching period duration so that the efficiency is optimized over the line/load range. In very?light?load conditions, the circuit can enter the soft?SKIP mode for minimized losses. Its protection features are soft? and fast?overvoltage protection, line?sag and brown?out detection, 2?level over current detection, bulk under?voltage detection, OVP2: redundant over?voltage protection using the ZCD pin, thermal shutdown. Typical applications are PC power supplies, all off?line appliances requiring power factor correction.

• Multimode operation for optimized operation over the line/load range
• Continuous conduction mode (CCM) in heavy?load conditions
• Frequency?clamped critical conduction mode (FCCrM) in medium? and light?load conditions
• DCM frequency reduction in light load conditions, minimum DCM frequency forced above 25KHz
• Valley turn?on in FCCrM, soft?SKIP mode in very light load conditions
• High?voltage start?up current source for VCC capacitor charge at start-up
• Internal compensation of the regulation loop, X2 cap discharge function
• Fast line/load transient compensation (dynamic response enhancer)
• Line range detection, pfcOK signal for enabling/disabling the downstream converter
• SOIC?9 NB package