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IR3621 Datasheet(PDF) 6 Page - International Rectifier |
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IR3621 Datasheet(HTML) 6 Page - International Rectifier |
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6 / 29 page  6 IR3621&(PbF) www.irf.com Figure 3 - IR3621Block Diagram BLOCK DIAGRAM PBias2 Bias Generator LDrv2 Two Phase Oscillator 0.8V 3V Ramp1 Sync Gnd HDrv2 VcH2 SS1 / SD Comp2 Error Amp2 PWM Comp2 POR VOUT3 28uA Reset Dom LDrv1 VCL HDrv1 VcH1 Fb1 Comp1 Error Amp1 PWM Comp1 Reset Dom Set1 Set2 Ramp2 64uA Max UVLO VcH2 VcH1 Fb2 PGnd2 Vcc Rt 0.8V SS2 / SD VP2 VREF PGood / OVP PGood R S Q Q S R VSEN1 VSEN2 OCSet2 OVP HDrv OFF / LDrv ON Thermal Shutdown PGnd1 OCSet1 28uA 64uA Hiccup Hiccup Control SS1 SS2 Mode Regulator Mode Control POR Mode 0.8V SS2 Mode 20uA 20uA POR 0.8V PBias1 0.3V SS1 Q R S PBias1 SS1 SS2 3uA 3uA POR 0.3V SS2 Q R S POR |
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