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NCP1253 Datasheet(PDF) 5 Page - ON Semiconductor |
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NCP1253 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 15 page NCP1253 www.onsemi.com 5 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 CURRENT COMPARATOR Vfold Default internal voltage set point for frequency foldback trip point – 45% of Vlimit 4 357 mV Vfreeze Internal peak current setpoint freeze ( ≈31% of Vlimit) 4 250 mV TDEL Propagation delay from current detection to gate off−state 4 100 150 ns TLEB Leading Edge Blanking Duration 4 300 ns TSS Internal soft−start duration activated upon startup, auto−recovery − 4 ms 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−ratio − 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(FB) 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 Ftrans Transition frequency below which skip−cycle occurs − 22 26 30 kHz Vfold,end End of frequency foldback feedback level, Fsw = Fmin 350 mV Vskip Skip−cycle level voltage on the feedback pin − 300 mV Skip hysteresis Hysteresis on the skip comparator − 30 mV INTERNAL SLOPE COMPENSATION Vramp Internal ramp level @ 25 °C (Note 4) 4 2.5 V Rramp Internal ramp resistance to CS pin 4 20 k W 4. A 1 M W resistor is connected from pin 4 to the ground for the measurement. PROTECTIONS VOVP Latched Overvoltage Protection on the VCC rail 5 24 25.5 27 V TOVPdel Delay before OVP confirmation on the VCC rail 5 20 ms Timer Internal auto−recovery fault timer duration − 100 130 160 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. |
Similar Part No. - NCP1253_14 |
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Similar Description - NCP1253_14 |
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