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NCP1207A, NCP1207B PWM Current-Mode Controller for Free Running Quasi-Resonant Operation The NCP1207A/B combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching www.onsemi.com (QuasiResonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls MARKING below a predetermined level. As this happens at low peak current, no DIAGRAM audible noise can be heard. For the NCP1207A, an internal 8.0 s timer 8 prevents the freerun frequency to exceed 125 kHz (therefore below the 1207A SOIC8 150 kHz CISPR22 EMI starting limit), while the skip adjustment ALYW 8 D SUFFIX capability lets the user select the frequency at which the burst foldback CASE 751 1 takes place. For the NCP1207B, the internal timer duration is reduced to 1 8 4.5 s to allow operation at higher frequencies (up to 200 kHz). The Dynamic SelfSupply (DSS) drastically simplifies the 1207B SOIC7 ALYW transformer design in avoiding the use of an auxiliary winding to 8 D SUFFIX 1 CASE 751U supply the NCP1207A/B. This feature is particularly useful in 1 applications where the output voltage varies during operation (e.g. 8 battery chargers). Due to its highvoltage technology, the IC is directly connected to the highvoltage DC rail. As a result, the PDIP8 1207AP P SUFFIX shortcircuit trip point is not dependent upon any V auxiliary level. AWL CC CASE 626 YYWWG The transformer core reset detection is done through an auxiliary 8 1 winding which, brought via a dedicated pin, also enables fast 1 Overvoltage Protection (OVP). Once an OVP has been detected, the 1207A/B/AP = Device Code A = Assembly Location IC permanently latches off. L, WL = Wafer Lot Finally, the continuous feedback signal monitoring implemented Y, YY = Year with an overcurrent fault protection circuitry (OCP) makes the final W, WW = Work Week design rugged and reliable. or G = PbFree Package FreeRunning Borderline/Critical Mode QuasiResonant Operation CurrentMode with Adjustable SkipCycle Capability PIN CONNECTIONS No Auxiliary Winding V Operation CC Dmg 18 HV AutoRecovery Overcurrent Protection FB 2 7 NC Latching Overvoltage Protection 3 6 V CS CC External Latch Triggering, e.g. Via Overtemperature Signal GND 4 5 Drv 500 mA Peak Current Source/Sink Capability Undervoltage Lockout for V Below 10 V CC Internal 1.0 ms SoftStart ORDERING INFORMATION Internal 8.0 s Minimum T for NCP1207A, OFF Device Package Shipping 4.5 s Minimum T for NCP1207B OFF Adjustable Skip Level NCP1207ADR2G SOIC8 2500/Tape & Reel (PbFree) Internal Temperature Shutdown Direct Optocoupler Connection NCP1207APG PDIP8 50 Units / Rail (PbFree) SPICE Models Available for TRANsient Analysis These are PbFree and HalideFree Devices NCP1207BDR2G SOIC7 2500/Tape & Reel Typical Applications (PbFree) AC/DC Adapters for Notebooks, etc. For information on tape and reel specifications, Offline Battery Chargers including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Consumer Electronics (DVD Players, SetTop Boxes, TVs, etc.) Brochure, BRD8011/D. Auxiliary Power Supplies (USB, Appliances, TVs, etc.) Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: May, 2016 Rev. 14 NCP1207A/D