NCP1618HDR2G

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