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AN3400 데이터시트(PDF) 23 Page - STMicroelectronics |
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AN3400 데이터시트(HTML) 23 Page - STMicroelectronics |
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23 / 78 page ![]() AN3400 Steady-state stage-wise circuit analysis Doc ID 018840 Rev 1 23/78 System of equations 6 where ICBp and VCBp are, respectively, the current and voltage signal of the forward biased C-B junction diode of the PNP bipolar. During this phase, in general, VEBp(t) is so that 0<VEBp(t)<VEBp-on for the PNP bipolar E-B junction diode but if it were VEBp(t)<0 the device would work in reverse active region since it is VCBp(t)>0. Therefore, in this last case, currents and voltages on the driving network are depicted by the information in Figure 14. Figure 14. Fifth stage: first re-circulating phase before PNP conduction time with PNP device working in reverse active region () ()t V t V C − = () ( ) () on EBp 2 D CBp EBp V t V t V t V − < − = where () on CBp CBp V t V − > and () on 2 D 2 D V t V − > () ()dt t I C 1 V t V 7 t 6 t Cn n a 2 Cnor Cn ∫ − = where () − = 6 Cn a 2 Cnor t V V () ()dt t I C 1 V t V 7 t 6 t Cp p a 2 Cpor Cp ∫ + = where () − = 6 Cp a 2 Cpor t V V () () () t V dt d C t I Cn n Cn ⋅ − = () () ()t V dt d C t I Cp p Cp ⋅ = () ( ) () ( ) ( ) ()t I t I t I t I t I t I RS 2 D LP Cp Cn CBp = − = + = ( ) () () ( ) ()t V t V t V t V t V EBp EBn Rb Cp Cn − = = + with () ( ) 0 t V t V BEn EBn > − = AM09805v1 L c Cp Cn Cs Rs Rb Ls VRs IRs VCn VCp ICn ICp IRb VRb ID2 ILP Lp VDD Q1 Q2 D1 D2 VCs VC GND PNP device in reverse active region PNP device in reverse active region First re-circulating phase before PNP conduction IBpnp VD2 ICpnp IEpnp Q2 IBpnp I |
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