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NCP1249AD65R2G Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP1249AD65R2G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 31 page NCP1249A, NCP1249B http://onsemi.com 6 Table 4. 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 REMOTE SECTION V_REM_on Remote pin voltage below which is the off−mode deactivated (VREM going down) (VCC = 0 V) 2 1 1.5 2 V V_REM_off Remote pin voltage above which is the off−mode activated (VREM going up) 2 7.2 8 8.8 V REM_Timer Remote timer duration 2 70 − 140 ms R_SW_REM Internal remote pull down switch resistance 2 1000 − 3000 W I_REM_leak Remote input leakage current (VREM = 9 V) (Note 1) 2 − 0.02 1 mA FEEDBACK SECTION Rup(FB) Internal pull−up resistor 3 17 kW Req Equivalent ac resistor from FB to gnd 3 10 15 20 kW Iratio Pin 3 to current setpoint division ratio 3,4 4 − Vfreeze_FB Feedback voltage below which the peak current is frozen 3 1 V FREQUENCY FOLDBACK Vfold_FB Frequency foldback level on the feedback pin – ≈47% of maximum peak current 3 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 3 1.5 V Vskip Skip−cycle level voltage on the feedback pin 3 400 mV Skip hysteresis Hysteresis on the skip comparator – note 1 3 30 mV INTERNAL SLOPE COMPENSATION Vramp Internal ramp level @ 25°C – note 3 4 2.5 V Rramp Internal ramp resistance to CS pin 4 20 kW PROTECTIONS Vlatch Latching level input 5 2.7 3 3.3 V Tlatch−blank Blanking time after drive turn off 5 1 ms Tlatch−count Number of clock cycles before latch confirmation − 4 − Tlatch−del OVP detection time constant 5 600 ns VOVL Feedback voltage at which an overload is considered – OPP pin is grounded 3 3.2 V VSC Feedback voltage above which a short−circuit is considered 3 3.9 4.1 4.3 V Timer1 Fault timer duration when 3.2 < VFB < 4.1 V − overload − 100 200 300 ms Timer2 Fault timer duration when VFB > 4.1 V is Timer1/4 – short−circuit condition − 25 50 75 ms VOVP Latched Over voltage protection on the Vcc rail 8 26 27.5 29 V TOVP_del Delay before OVP on Vcc confirmation 8 20 30 ms TA−rec_timer Auto−recovery timer duration − 0.7 − − s TEMPERATURE SHUTDOWN TTSD Temperature shutdown TJ going up − 150 °C TTSD(HYS) Temperature shutdown hysteresis − 30 °C 2. Guaranteed by design 3. See characterization table for linearity over negative bias voltage – we recommend keeping the level on pin 5 below −300 mV. 4. A 1−MW resistor is connected from pin 4 to the ground for the measurement. |
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