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NCP1631 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP1631 Datasheet(HTML) 8 Page - ON Semiconductor |
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8 / 24 page  NCP1631 www.onsemi.com 8 DRV1 VD D Regul Vcc Ou tp u t Buffer 1 Internal TS D OF F UVLO FB Vcontrol Rt Vton processing circuitry Vton ZCD2 GND DT SHDN OF F OSC Iref + − Vovp = Vref OVP OFF SHDN Error Amplifier Vref 0.955*Vref Vout low detect FFOLD Vcc 3V 5R REF5V BO OVP OFF OVLflag1 All the RS latches are RESET dom inant Stup ZCD1 Latch Vr ef 12% Vr ef UVP BO_NOK Vcc_OK pfcOK 230 mA VD D Vref pfcOK OVLflag1 Lstup 4R DT DRV1 Fault management OC P In−rush Ics CS SK I P ( 0.6 V cl amp vo ltag e i s acti vated) UVP In−rush Vcc < Vcc(r eset) Vcc(on) Vcc(off) OVP DRV2 Ou tp u t Buffer 2 Vcc BO_NOK Brown−out 50−ms delay DRV2 L SHDN OFF SKIP OC P STOP Vp wm2 STOP Vp wm1 STOP CLK1 CLK2 CLK1 CLK2 Vp wm1 Vp wm2 DRV1 DRV2 DRV1 DRV2 pfcOK IRt_low IRt_low In−rush In−rush In−rush BO_NOK Vcc_OK pfcOK Figure 2. Functional Block Diagram pfcOK/ REF5V R S Q VZCD1 VDMG1 VZCD2 VDMG2 VBO Zero current detection for phase 1 Zero current detection for phase 2 VBOcomp detection with VBO QZCD1 QZCD2 ICS > 210 mA ICS > 14 mA Current Sense Block (Building of ICS proportional to ICOIL) S R Q IFF VZCD1 VZCD2 ICH Oscillator block with interleaving and frequency foldback S R Q Lpwm1 S Q R Lpwm2 Thermal Shutdown ±20 mA IFF VREGUL IRt < 7 mA VBOcomp Generation of the oscillator charge current IFF as a function of VREGUL (frequency fold−back) Generation of the charge current for the internal timing capacitors (max on−time setting for the two phases) On−time control for the two phases |
Similar Part No. - NCP1631_16 |
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Similar Description - NCP1631_16 |
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