NCP1231 Datasheet | onsemi

features offered by the NCP1231 is an event management scheme that can disable the front- end PFC circuit during standby, thus reducing the no load power consumption. The NCP1231 itself goes into cycle skipping at light loads while limiting peak current (to 25% of nominal peak) so that no acoustic noise is generated and while in the skip cycle mode. The NCP1231 also features an internal latching function that can be used for Overvoltage Protection (OVP). The latch is triggered when the voltage on Pin 8 rises above 4.0 V. During an OVP condition, the output drive pulses are immediately stopped and the NCP1231 stays in the latched off condition until VCC drops below 4.0 V (VCCreset). In addition, Pin 8 also serves as a Brown- Out input which provides the necessary safety feature when the SMPS faces low mains situations. Features http://onsemi. MARKING DIAGRAMS 8 SOIC- 8 D SUFFIX CASE 751 1 8 PDIP- 8 P SUFFIX CASE 626 1 1 1231Pzz AWL YYWWG 231Dx y ALYW G - - - - - - - - - - - - - - - Current- Mode Operation with Internal Ramp pensation Extremely Low Startup Current of 30 m A Typical Skip- Cycle Capability at Low Peak Currents Adjustable Soft- Start Overvoltage and Brown- Out Protection Short- Circuit Protection Independent of Auxiliary Level Internal Frequency Dithering for Improved EMI Signature Go- To- Standby Signal for PFC Front Stage Extremely Low No- Load, Noiseless, Standby Power Internal Leading Edge Blanking +500 m A/- 800 m A Peak Current Drive Capability Available in Three Frequency Options: 65 k Hz, 100 k Hz, and 133 k Hz Direct Optocoupler Connection SPICE Models Available for TRANsient and AC Analysis Pb- Free Packages are Available 231Dxy = Device Code x = 1 or 6 y = 0 or 3 1231Pzz = Device Code zz = 65, 100 or 133 A = Assembly Location L, WL = Wafer Lot Y, YY = Year W, WW = Work Week G or G = Pb- Free Package PIN CONNECTIONS PFC_VCC FB CS GND 1 8 BO/OVP SS VCC DRV Typical Applications ORDERING INFORMATION See detailed ordering and shipping information in the...