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NCP12401EBAAA1 Datasheet(PDF) 4 Page - ON Semiconductor |
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NCP12401EBAAA1 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 44 page NCP12401 www.onsemi.com 4 SIMPLIFIED INTERNAL BLOCK SCHEMATIC Figure 2. Simplified Internal Block Schematic freq folback jittering Skip _CMP SkipB 4uMho Ramp_OTA CSref Soft Start timer Reset Q Set Qb Clamp Fault timer TSD FB CS DRV GND VCC Fault Ilimit_CMP PWM_CMP SoftStart_CMP LEB 250 ns LEB 120 ns CSstop_CMP TSD Latch Enable RESET SS _end Ilimit Vfb(reg) MAX_ton MAX_ton Brown_Out Reset Q Set Qb PWM IC stop V to I Iopc = 0.5u*(Vhv −125) Off_mode_CMP1 ICstart FBbuffer VCC UVLO_CMP FAULT VccOVP OTP OTP_CMP OVP_CMP HV Brown_In VccOVP_CMP Vdd Set Q Rese t Qb Latch Brown_Out RESET OVP AC_Off UVLO VCC Vcc_Int IC stopB Vhv DC sample OM & X2 & Vcc Vdd reg Vdd Vcc regulator PowerOnReset _CMP control Dual HV start −up current source TSD RESET Vfb < 1.64 V fix current setpoint 210mV X 2 discharge 11 V regulator ON_CMP STOP_CMP VccON VccMIN GoToOffMode timer 500ms Set Q Reset Qb Off_mode_CMP2 FM input OSC 65kHz PFM input Square output Saw output ton_max output 3. 0V Vdd 4 events timer LEB 1 us OVP_CMP DRV 4 events timer 600ns timer 55 us Filter 300 us Filter 10 us Filter |
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