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NCP4326 Datasheet(PDF) 1 Page - ON Semiconductor |
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NCP4326 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 30 page © Semiconductor Components Industries, LLC, 2005 September, 2005 − Rev. 1 1 Publication Order Number: NCP4326/D NCP4326 Secondary Controller for Multi−Output Quasi−Resonant Switchmode Power Supplies This secondary controller significantly improves the overall efficiency and cross−regulation figures when used in a Switchmode Power Supply. Compared to traditional regulation schemes, the NCP4326 provides superior performance in cross−regulation by individually regulating outputs. Powered from a main winding, the device actuates two independent switches that precisely adjust the considered outputs to resistor−selectable voltages. This controller also integrates a precision reference voltage, which together with a dedicated operational amplifier reduces the feedback loop elements to the minimum. In the end three independent output voltages can be controlled by a single device. A skip cycle feature improves the stand by power in light load condition. Finally, dedicated shutdown pins offer an easy mean to disable the secondary outputs in applications where a low standby power performance is key. Features • 0% to 100% Duty Cycle Range • Integrated Shunt Regulator for Optocoupler Control • Internal Voltage Reference (1.25 V, 1% @ 25°C) • 2 Independent Power MOSFET Drivers • Enable/Disable for Each Driver • Independent Soft−Starts on both Output Drivers • Independent Skip Cycle on both Output Drivers • Standby Pin • 580 / 650 mA Peak Current Source/Sink Driver Capability • Synchronization Pin • 5 V Undervoltage Lock−Out on Vcc • Pb−Free Package is Available Applications • Consumer Electronics Applications: DVD, Set Top Box, CDR, Game Console • Any Multi−Output Voltage Quasi−Resonant SMPS http://onsemi.com MARKING DIAGRAM SOIC−16 D SUFFIX CASE 751B NCP4326DG AWLYWW 1 A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week G = Pb−Free Device (Bottom View) Device Package Shipping{ ORDERING INFORMATION NCP4326DR2 3000 Tape & Reel SOIC−16 †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. PIN CONNECTIONS CP1 FB1 EN2 CP2 FB2 Ct Sync CPm EN1 GND Flux DRV1 Vcc DRV2 STBY FBm 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NCP4326DR2G 3000 Tape & Reel SOIC−16 (Pb−Free) |
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