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NCP1239ED65R2G Datasheet(PDF) 4 Page - ON Semiconductor |
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NCP1239ED65R2G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 26 page NCP1239 www.onsemi.com 4 Figure 2. Simplified Block Diagram Vcc Drv LEB GND CS FB HV Dual HV startup current source HV sample 600−ns time constant Up counter 4 RST OVP/OTP gone? Fault Vfault(clamp) VFault(OTP) VFault(OVP) IOTP Option for OVP_VCC Up counter 4 RST VLimit2 LEB 120 ns 300 ns VLimit1 Soft−start Ramp 8 ms SS end Vdd / 4 Rup Vskip Overcurrent Soft−start PWM Oscillator 65 kHz / 100 kHz Compensation Slope Stop Foldback Jitter S R Q Q OCP_flag PWM OCP Timer 64 ms OCP_flag Skip HV detection & sampling BO Vcc logic management 20us time constant TSD VCC(OVP) OVP_VCC OVP_VCC (option) Vdd Vdd Vcc(reset) UVLO S R Q Q Vcc(reset) Latch Protection Mode Reset Vcc(reset) Timer 1 s Auto−recovery S R Q Q Clamp Clock BO Latch TSD Skip Clock + NC BO end BO end UVLO Vdd Ibias OCP Fault gone? BO TSD TSD end Iopp HV sample Dmax OPP Current Generation |
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