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NCP1338DR2G Datasheet(PDF) 1 Page - ON Semiconductor |
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NCP1338DR2G Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 15 page © Semiconductor Components Industries, LLC, 2010 March, 2010 − Rev. 1 1 Publication Order Number: NCP1338/D 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 Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi−Resonant operation). The transformer core reset detection is done internally, without using any external signal, due to the Soxyless concept. The frequency is internally limited to 130 kHz, preventing the controller from operating above the 150 kHz CISPR−22 EMI starting limit. By monitoring the feedback pin activity, the controller enters skip mode as soon as the power demand falls below a predetermined level. As each restart is softened by an internal Soft−Skip t, and as the frequency cannot go below 25 kHz, no audible noise can be heard. The NCP1338 also features an efficient protective circuitry which, in presence of an overcurrent condition, disables the output pulses and enters a safe burst mode, trying to restart. Once the default has gone, the device auto−recovers. Also included is a bulk voltage monitoring function (known as brown−out protection), an adjustable overpower compensation, and a VCC OVP. The fault timer is reset by any of these 3 conditions to ensure that the controller immediately restarts when the condition disappears. Finally, an internal 4.0 ms soft−start eliminates the traditional startup stress. NCP1338 can be used in applications where the VCC supply voltage is delivered by an external dc voltage source. Features • Free−Running Borderline/Critical Mode Quasi−Resonant Operation • Current−Mode • Soft−Skip Mode with Minimum Switching Frequency for Standby • Auto−Recovery Short−Circuit Protection Independent of Auxiliary Voltage • Overvoltage Protection • Brown−Out Protection • Two Externally Triggerable Fault Comparators (one for a disable function, and the other for a permanent latch) • Internal 4.0 ms Soft−Start • 500 mA Peak Current Drive Sink Capability • 130 kHz Max Frequency • Internal Leading Edge Blanking • Internal Temperature Shutdown • Direct Optocoupler Connection • Dynamic Self−Supply with Levels of 12 V (On) and 10 V (Off) • SPICE Models Available for TRANsient and AC Analysis • These are Pb−Free Devices Typical Applications • AC−DC Adapters for Notebooks, etc. • Offline Battery Chargers • Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.) • Auxiliary Power Supplies (USB, Appliances, TVs, etc.) PDIP−7 P SUFFIX CASE 626B PIN CONNECTIONS Device Package Shipping† ORDERING INFORMATION NCP1338PG PDIP−7 (Pb−Free) 50 Units/Rail http://onsemi.com MARKING DIAGRAM A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week G, G = Pb−Free Package (Top View) FB BO CS GND DRV HV VCC NCP1338P AWL YYWWG 1 SOIC−7 D SUFFIX CASE 751U NCP1338DR2G SOIC−7 (Pb−Free) 2500 Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. 1 2 3 4 8 6 5 P1338 ALYWG G 1 8 7 (Note: Microdot may be in either location) |
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