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NCP1937A3DR2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1937A3DR2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 38 page NCP1937 www.onsemi.com 11 Table 4. ELECTRICAL CHARACTERISTICS: (VCC = 12 V, VBO/X2 = 120 V, VHV/X2 = 120 V, VFault = open, VRPFBHV = 20 V, VPFBLV = 2.4 V, VPControl = 4 V, VPCS/PZCD = 0 V, VQFB = 3 V, VPONOFF = 4 V, VQCS = 0 V, VQZCD = 0 V, VPSTimer = 0 V, RPFBHV = 200 kW, CVCC = 100 nF , CQCT = 220 pF, CPDRV = 1 nF, CQDRV = 1 nF, for typical values TJ = 25_C, for min/max values, TJ is – 40_C to 125_C, unless otherwise noted) Characteristics Unit Max Typ Min Symbol Pin Conditions QR FLYBACK GATE DRIVE Rise Time (10−90%) VQDRV from 10 to 90% 14 tQDRV(rise) – 40 80 ns Fall Time (90−10%) 90 to 10% of VQDRV 14 tQDRV(fall) – 20 40 ns Driver Resistance Source Sink 14 RQDRV(SRC) RQDRV(SNK) 13 7 W Current Capability Source Sink VQDRV = 2 V VQDRV = 10 V 14 IQDRV(SRC) IQDRV(SNK) – – 500 800 – – mA High State Voltage VCC = VCC(off) + 0.2 V, RQDRV = 10 kW VCC = 26 V, RQDRV = 10 kW 14 VQDRV(high) 8 10 – 12 – 14 V Low Stage Voltage VFault = 4 V 14 VQDRV(low) – – 0.25 V QR FLYBACK FEEDBACK Internal Pull−Up Current Source 10 IQFB 48 50 52 mA Feedback Input Open Voltage 10 VQFB(open) 4.8 5.0 5.2 V VQFB to Internal Current Setpoint Division Ratio 10 KQFB 3.95 4.0 4.15 – QFB Pull Up Resistor VPSTimer = 3 V; VQFB = 0.4 V 10 RQFB 365 400 435 k W Valley Thresholds Transition from 1st to 2nd valley Transition from 2nd to 3rd valley Transition from 3rd to 4th valley Transition from 4th valley to VCO Transition from VCO to 4th valley Transition from 4th to 3rd valley Transition from 3rd to 2nd valley Transition from 2nd to 1st valley VQFB decreasing VQFB decreasing VQFB decreasing VQFB decreasing VQFB increasing VQFB increasing VQFB increasing VQFB increasing 10 VH2D VH3D VH4D VHVCOD VHVCOI VH4I VH3I VH2I 1.316 1.128 0.846 0.752 1.316 1.504 1.692 1.880 1.400 1.200 0.900 0.800 1.400 1.600 1.800 2.000 1.484 1.272 0.954 0.848 1.484 1.696 1.908 2.120 V Skip Threshold VQFB decreasing 10 VQSKIP 0.35 0.40 0.45 V Skip Hysteresis VQFB increasing 10 VQSKIP(HYS) 25 50 75 mV Delay Exiting Skip Mode to 1st QDRV Pulse Apply 1 V step from VQSKIP 10 tdelay(QSKIP) – – 10 ms Maximum On Time 14 tonQR(MAX) 26 32 38 ms QR FLYBACK TIMING CAPACITOR QCT Operating Voltage Range VQFB = 0.5 V 7 VQCT(peak) 3.815 4.000 4.185 V On Time Control Source Current VQCT = 0 V 7 IQCT 18 20 22 mA Minimum voltage on QCT Input 7 VQCT(min) – – 90 mV Minimum Operating Frequency in VCO Mode VQCT = VQCT(peak) + 100 mV 7 fVCO(MIN) 23.5 27 30.5 kHz |
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