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NCP1012ST65T3G Datasheet(PDF) 3 Page - ON Semiconductor |
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NCP1012ST65T3G 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 typic- ally 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 GND The IC Ground -- 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 GND The IC Ground -- 4 8 GND The IC Ground -- 65, 100 or 130 kHz Clock Overload? UVLO Management GND NC VCC FB Drain GND GND Figure 2. Simplified Internal Circuit Architecture 2 1 3 4 IVCC I? Vclamp* 4V 18 k Error flag armed? EMI Jittering VCC Startup Source Drain Flip--Flop DCmax = 65% Reset Reset High when VCC < 3V 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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