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NCP1212 Folha de dados(PDF) 1 Page - ON Semiconductor |
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NCP1212 Folha de dados(HTML) 1 Page - ON Semiconductor |
1 / 22 page © Semiconductor Components Industries, LLC, 2004 October, 2004 − Rev. 2 1 Publication Order Number: NCP1212/D NCP1212 Current Mode PWM Controller for Both Forward and Flyback Converters NCP1212 is a high performance current mode PWM controller specifically designed for off−line and DC−to−DC converter applications. The device requires very few external components and offers designer additional protection for better system reliability. The device features a trimmed oscillator for precise Duty Cycle control, accurate bandgap voltage reference, high gain error amplifier, current sensing comparator and a high current totem pole output gate driver that ideally drives the external power MOSFET. Additionally, the device has built−in programmable Brownout Detect and Soft−Start features to enhance system reliability. Also, the 48%/82% selectable maximum turn on Duty Cycle control and external programmable switching frequency capabilities make this device an ideal controller for both forward and flyback configurations. This device is available in both PDIP−8 and space saving SOIC−8 packages. Features • Pb−Free Package is Available • Trimmed Oscillator Charge and Discharge Current for Precise Duty Cycle Control • Internal High Accuracy Bandgap Voltage Reference • Current Mode Operation up to 200 kHz • Inherent Feed Forward Compensation • Latching PWM for Cycle−by−Cycle Current Limiting • High Current Totem Pole Output Gate Driver • Low Startup and Operating Current • Internal Undervoltage Lockout with Hysteresis • Internal Leading Edge Blanking for Current Feedback • Direct Interface with Optocoupler for Secondary Sensing • Built−in Soft−Start Function, Programmable by External Capacitor • User Programmable 48%/82% Maximum Duty Cycle Selection • Output Overvoltage Protection Against Open Loop • AC Line Brownout Detect Protection • Output Overload Protection Irrespective of Auxiliary Voltage Level Typical Applications • ATX PC Power Supply • Universal Input Wall Mount Adaptors • CRT Monitor • All Flyback and Forward SMPS Systems PDIP−8 P SUFFIX CASE 626 1 8 1 8 SOIC−8 D SUFFIX CASE 751 18 5 3 4 (Top View) FB CS SS/DMAX PIN CONNECTIONS 7 6 2 VCC BOK CT GND DRV MARKING DIAGRAMS A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week N1212 ALYW NCP1212 AWL YYWW 1 8 Device Package Shipping† ORDERING INFORMATION NCP1212DR2 SOIC−8 2500 Tape & Reel NCP1212P PDIP−8 50 Units/Rail http://onsemi.com NCP1212PG PDIP−8 (Pb−Free) 50 Units/Rail †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 1 8 |
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Descrição semelhante - NCP1212 |
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