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NCP1337 PWM Current-Mode Controller for Free Running Quasi-Resonant Operation The NCP1337 combines a true current mode modulator and a demagnetization detector which ensures full Borderline/Critical Conduction Mode in any load/line conditions together with www.onsemi.com minimum drain voltage switching (QuasiResonant operation). The transformer core reset detection is done internally, without using MARKING any external signal, due to the Soxyless concept. The frequency is DIAGRAM internally limited to 130 kHz, preventing the controller to operate 7 above the 150 kHz CISPR22 EMI starting limit. By monitoring the feedback pin activity, the controller enters skip NCP1337P PDIP7 mode as soon as the power demand falls below a predetermined AWL P SUFFIX YYWWG level. As each restart is softened by an internal SoftSkip , and as CASE 626B the frequency cannot go below 25 kHz, no audible noise can be 1 heard. The NCP1337 also features an efficient protective circuitry which, 8 in presence of an overcurrent condition, disables the output pulses P1337 SOIC7 and enters a safe burst mode, trying to restart. Once the default has ALYW D SUFFIX gone, the device autorecovers. Also included is a bulk voltage CASE 751U monitoring function (known as brownout protection), an adjustable 1 overpower compensation, and a V OVP. The controller CC immediately restarts after any of these conditions, unless the fault A = Assembly Location timer has timed out. Finally, an internal 4.0 ms softstart eliminates WL, L = Wafer Lot YY, Y = Year the traditional startup stress. WW, W = Work Week G, = PbFree Package Features (Note: Microdot may be in either location) FreeRunning Borderline/Critical Mode QuasiResonant Operation CurrentMode PIN CONNECTIONS SoftSkip Mode with Minimum Switching Frequency for Standby 1 8 AutoRecovery ShortCircuit Protection Independent of Auxiliary BO HV Voltage 2 FB Overvoltage Protection 3 6 BrownOut Protection VCC CS 4 5 Two Externally Triggerable Fault Comparators (one for a disable GND DRV function, and the other for a permanent latch) (Top View) Internal 4.0 ms SoftStart 500 mA Peak Current Drive Sink Capability ORDERING INFORMATION 130 kHz Max Frequency Internal Leading Edge Blanking Device Package Shipping Internal Temperature Shutdown NCP1337PG PDIP7 50 Units/Rail Direct Optocoupler Connection (PbFree) Dynamic SelfSupply with Levels of 12 V (On) and 10 V (Off) NCP1337DR2G SOIC7 2500 Tape & Reel SPICE Models Available for TRANsient and AC Analysis (PbFree) These are PbFree Devices For information on tape and reel specifications, including part orientation and tape sizes, please Typical Applications refer to our Tape and Reel Packaging Specification ACDC Adapters for Notebooks, etc. Brochure, BRD8011/D. Offline Battery Chargers Consumer Electronics (DVD Players, SetTop Boxes, TVs, etc.) Auxiliary Power Supplies (USB, Appliances, TVs, etc.) Semiconductor Components Industries, LLC, 2014 1 Publication Order Number: December, 2014 Rev. 6 NCP1337/D