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NCP1251ASN65T1G Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP1251ASN65T1G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 24 page NCP1251 www.onsemi.com 6 ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, Max TJ = 150°C, VCC = 12 V unless otherwise noted) Symbol Unit Max Typ Min Pin Rating INTERNAL OSCILLATOR fOSC Oscillation frequency (65 kHz version) − 61 65 71 kHz fOSC Oscillation frequency (100 kHz version) − 92 100 108 kHz Dmax Maximum duty−cycle − 76 80 84 % fjitter Frequency jittering in percentage of fOSC − ±5 % fswing Swing frequency − 240 Hz FEEDBACK SECTION Rup Internal pull−up resistor 2 20 k W Req Equivalent ac resistor from FB to GND 2 16 k W Iratio Pin 2 to current setpoint division ratio − 4.2 Vfreeze Feedback voltage below which the peak current is frozen 2 1.05 V FREQUENCY FOLDBACK Vfold Frequency foldback level on the feedback pin – [45% of maximum peak current − 1.5 V VfoldF Frequency foldback level on the feedback pin – [59% of maximum peak current (F version only) − 1.9 V Ftrans Transition frequency below which skip−cycle occurs − 22 26 30 kHz Vfold,end End of frequency foldback feedback level, Fsw = Fmin 350 mV VfoldF,end End of frequency foldback feedback level, Fsw = Fmin (F version only) 1.5 V Vskip Skip−cycle level voltage on the feedback pin − 300 mV Skip hysteresis Hysteresis on the skip comparator – (Note 5) − 30 mV INTERNAL SLOPE COMPENSATION Vramp Internal ramp level @ 25 °C – (Note 7) 4 2.5 V Rramp Internal ramp resistance to CS pin 4 20 k W PROTECTIONS Vlatch Latching level input 3 2.7 3 3.3 V Tlatch−blank Blanking time after drive turn off 1 1.0 ms Tlatch−count Number of clock cycles before latch confirmation − 4.0 Tlatch−del OVP detection time constant 1 600 ns Timer Internal auto−recovery fault timer duration − 100 130 160 ms VOVP Latched Over voltage protection on the VCC rail 5 24 25.5 27 V TOVPdel Delay before OVP on VCC confirmation 5 20 ms Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 4. For design robustness, we recommend to inject 60 mA as a minimum at the lowest input line voltage. 5. Guaranteed by design 6. See characterization table for linearity over negative bias voltage 7. A 1 M W resistor is connected from pin 3 to the ground for the measurement. |
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