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NCP1338 PWM Current-Mode Controller for Free Running Quasi-Resonant Operation The NCP1338 combines a true current mode modulator and a demagnetization detector which ensures full Borderline/Critical www.onsemi.com Conduction Mode in any load/line conditions together with minimum drain voltage switching (QuasiResonant operation). The MARKING transformer core reset detection is done internally, without using any DIAGRAM external signal, due to the Soxyless concept. The frequency is 7 internally limited to 130 kHz, preventing the controller from operating above the 150 kHz CISPR22 EMI starting limit. NCP1338P PDIP7 By monitoring the feedback pin activity, the controller enters skip AWL P SUFFIX mode as soon as the power demand falls below a predetermined YYWWG CASE 626B level. As each restart is softened by an internal SoftSkip , and as 1 the frequency cannot go below 25 kHz, no audible noise can be heard. 8 The NCP1338 also features an efficient protective circuitry which, P1338 SOIC7 in presence of an overcurrent condition, disables the output pulses ALYW D SUFFIX and enters a safe burst mode, trying to restart. Once the default has CASE 751U gone, the device autorecovers. Also included is a bulk voltage 1 monitoring function (known as brownout protection), an adjustable overpower compensation, and a V OVP. The fault timer is reset by A = Assembly Location CC any of these 3 conditions to ensure that the controller immediately WL, L = Wafer Lot YY, Y = Year restarts when the condition disappears. Finally, an internal 4.0 ms WW, W = Work Week softstart eliminates the traditional startup stress. NCP1338 can be G, = PbFree Package used in applications where the V supply voltage is delivered by an CC (Note: Microdot may be in either location) external dc voltage source. Features PIN CONNECTIONS FreeRunning Borderline/Critical Mode QuasiResonant Operation 1 8 CurrentMode BO HV SoftSkip Mode with Minimum Switching Frequency for Standby 2 FB AutoRecovery ShortCircuit Protection Independent of Auxiliary 3 6 VCC Voltage CS 4 5 Overvoltage Protection GND DRV Brown Out Protection (Top View) Two Externally Triggerable Fault Comparators (one for a disable function, and the other for a permanent latch) ORDERING INFORMATION Internal 4.0 ms SoftStart 500 mA Peak Current Drive Sink Capability Device Package Shipping 130 kHz Max Frequency NCP1338PG PDIP7 50 Units/Rail Internal Leading Edge Blanking (PbFree) Internal Temperature Shutdown NCP1338DR2G SOIC7 2500 Tape & Reel Direct Optocoupler Connection (PbFree) Dynamic SelfSupply with Levels of 12 V (On) and 10 V (Off) For information on tape and reel specifications, SPICE Models Available for TRANsient and AC Analysis including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification These are PbFree Devices Brochure, BRD8011/D. Typical Applications AC DC Adapters for Notebooks, etc. 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. 2 NCP1338/D