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AN3400 Datasheet(PDF) 49 Page - STMicroelectronics |
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AN3400 Datasheet(HTML) 49 Page - STMicroelectronics |
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49 / 78 page  AN3400 Modeling of the re-circulating phase preliminary to the PNP conduction time phase Doc ID 018840 Rev 1 49/78 where: System of equations 21 During the simulation phase, solutions for the VCn and VCp voltage functions have been calculated with the ODE45 simulator in a time interval as large as the length of the forcing signal Is opportunely modeled in order to take into consideration the effect of demagnetization current for the inductor Lp. For the PNP bipolar base current IBpnp, the following formula reported is valid during the whole re-circulating phase preliminary to the PNP conduction time: Equation 26 in which VCn-pnpric(t) is a discharging voltage on the Cn capacitor (that is ). CBp Cp Cn 2 D LP RS 1 S I I I I I I I = + = − = = for t6<t<t7; = S I Bp Cp Cn 2 E LP RS 2 S I I I I I I I = + = + = = for t7<t<t8; () ( ) ( ) () () () ( ) t V dt d C t V dt d C t I t I t I pnpric Cp pnpric Cn pnpric Cp pnpric Cn Bpnp − − − − ⋅ + ⋅ − = + = () () 0 t V dt d pnpric Cn < − |
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