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NCP1217 Datasheet(PDF) 1 Page - ON Semiconductor |
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NCP1217 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 19 page Semiconductor Components Industries, LLC, 2010 December, 2010 -- Rev. 7 1 Publication Order Number: NCP1217/D NCP1217, NCP1217A Enhanced PWM Current--Mode Controller for High--Power Universal Off--Line Supplies Housed in an SO--8 or PDIP--7 package, the NCP1217 represents the enhanced version of the NCP1203--based controllers. Due to its high drive capability, NCP1217 drives large gate--charge MOSFETs, which together with internal ramp compensation and built--in overvoltage protection, ease the design of modern AC/DC adapters. NCP1217 offers a true alternative to UC384X--based designs. With an internal structure operating at different fixed frequencies (65–100–133 kHz), the controller features a high--voltage startup FET, which ensures a clean and loss less startup sequence. Its current--mode control topology provides an excellent input audio--susceptibility and inherent pulse--by--pulse control. Internal ramp compensation easily prevents subharmonic oscillations from taking place in continuous conduction mode designs. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so--called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at a user adjustable low peak current, no acoustic noise takes place. The NCP1217 features two efficient protective circuitries: 1) In presence of an overcurrent condition, the output pulses are disabled and the device enters a safe burst mode, trying to restart. Once the default has gone, the device auto--recovers. 2) If an external signal (e.g. a temperature sensor) pulls Pin 1 above 3.2 V, output pulses are immediately stopped and the NCP1217 stays latched in this position. Reset occurs when the VCC collapses to ground, e.g. the user unplugs the power supply. Features Current--Mode with Adjustable Skip--Cycle Capability Built--in Internal Ramp Compensation Auto--Recovery Internal Output Short--Circuit Protection Internal 1.0 ms Soft--Start (NCP1217A Only) Limited Duty--Cycle to 50% (NCP1217A Only) Full Latchoff if Adjustment Pin is Brought High Extremely Low No--Load Standby Power Internal Temperature Shutdown 500 mA Peak Current Capability Fixed Frequency Versions at 65 kHz, 100 kHz and 133 kHz Direct Optocoupler Connection Internal Leading Edge Blanking SPICE Models Available for TRANsient and AC Analysis These are Pb--Free Devices Typical Applications High Power AC/DC Converters for TVs, Set--Top Boxes, etc. Offline Adapters for Notebooks Telecom DC--DC Converters All Power Supplies MARKING DIAGRAMS xxxx = Specific Device Code A = Assembly Location L, WL = Wafer Lot Y, YY = Year W, WW = Work Week G or G = Pb--Free Package http://onsemi.com PDIP--8 N SUFFIX CASE 626 1 8 SOIC--8 D1, D2 SUFFIX CASE 751 18 5 3 4 (Top View) Adj CS HV PIN CONNECTIONS 7 6 2 NC FB GND Drv VCC See detailed ordering and shipping information in the ordering information section on page 17 of this data sheet. ORDERING INFORMATION 17xxx ALYW G 1 8 1 8 P1217xxxx AWL YYWWG 1 See detailed device marking information in the ordering information section on page 17 of this data sheet. DEVICE MARKING INFORMATION |
Similar Part No. - NCP1217_10 |
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Similar Description - NCP1217_10 |
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