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NCP1014AP100 Datasheet(PDF) 3 Page - ON Semiconductor |
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NCP1014AP100 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 24 page NCP1010, NCP1011, NCP1012, NCP1013, NCP1014 http://onsemi.com 3 PIN FUNCTION DESCRIPTION Pin No. (SOT−223) Pin No. (PDIP−7, PDIP−7/Gull Wing) Pin Name Function Description 1 1 VCC Powers the Internal Circuitry This pin is connected to an external capacitor of typi- cally 10 mF. The natural ripple superimposed on the VCC participates to the frequency jittering. For im- proved standby performance, an auxiliary VCC can be connected to Pin 1. The VCC also includes an active shunt which serves as an opto fail−safe protection. − 2 NC − − − 3 NC − − 2 4 FB Feedback Signal Input By connecting an optocoupler to this pin, the peak current setpoint is adjusted accordingly to the output power demand. 3 5 Drain Drain Connection The internal drain MOSFET connection. − − − − − − 7 NC − This unconnected pin ensures adequate creepage distance. 4 8 GND The IC Ground − 65, 100 or 130 kHz Clock Overload? UVLO Management NC NC VCC FB Drain NC GND Figure 2. Simplified Internal Circuit Architecture 2 1 3 4 IVCC I? Vclamp* 4 V 18 k Error flag armed? EMI Jittering VCC Startup Source Drain Flip−Flop DCmax = 65% Reset Reset High when VCC t 3 V Driver S Q R − + Iref = 7.4 mA IVCC Set Q VCC 8 Rsense 250 ns L.E.B. 7 5 − + + − Soft−Start Startup Sequence Overload 0.5 V Drain *Vclamp = VCCOFF + 200 mV (8.7 V Typical) |
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