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AN3400 bảng dữ liệu(PDF) 21 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Analysis and simulation of a BJT complementary pair in a self-oscillating CFL solution
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AN3400
Steady-state stage-wise circuit analysis
Doc ID 018840 Rev 1
21/78
to the minimum value whereas the voltage on the capacitor Cn keeps nearly constant.
The final instant t6, from which the ICp capacitor current changes polarity, marks the
change of the V(t) signal polarity and one-half of its period. In this stage, currents and
voltages on the driving network are represented by the information in Figure 12, in
which the charging/discharging effects of the reverse biased B-E junction capacitances,
respectively, for the NPN and PNP devices, are neglected and so it is possible to
approximate
and
.
Figure 12.
Fourth stage: dead time after NPN conduction phase
According to the agreement of the previous image, the following equations are valid in the
driving section during the dead time after the NPN conduction phase for t5<t<t6:
System of equations 5
 
()
( )t
I
t
I
CCBn
Bnpn
≅
()
()t
I
t
I
CBCp
Bpnp
≅
AM09803v1
L
c
Cp
Cn
Cs
Rs
Rb
Ls
VRs
IRs
VCn
VCp
ICn
ICp
IRb
VRb
ILP
Lp
VDD
Q1
Q2
D1
D2
VCs
VC
GND
Dead time phase after NPN
conduction
ICCBn
VCEn
ICs
ICBCp
NPN base-collector junction
capacitance charge
PNP collector-base
junction capacitance
discharge
ICCBn
V
NPN base-collector junction
capacitance charge
PNP collector-base
junction capacitance
discharge
G
ICBCp
C
()
( )t
V
t
V
C
=
()
sat
CEn
CEn
V
t
V
−
>
()
()
()
( )
()
( ) 0
t
V
0
t
V
t
V
V
t
V
t
V
BEn
CS
CCBn
DD
EBn
BEn
<
⇒
>
−
−
−
=
=
−
()
()
()
()
( ) 0
t
V
0
t
V
t
V
t
V
t
V
EBp
CS
CBCp
BEp
EBp
<
⇒
>
−
=
=
−
()
()dt
t
I
C
1
V
t
V
6
t
5
t
Cn
n
1
Cnod
Cn
∫
−
=
where
()
−
=
5
Cn
1
Cnod
t
V
V
()
()dt
t
I
C
1
V
t
V
6
t
5
t
Cp
p
1
Cpod
Cp
∫
−
=
where
()
−
=
5
Cp
1
Cpod
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
CS
LP
CBCp
CCBn
RS
−
=
+
=
()
()
()
t
V
dt
d
Cs
t
I
CS
CS
⋅
−
=
( )
()
()
()
( )t
V
t
V
t
V
t
V
t
V
EBn
BEp
Rb
Cp
Cn
+
=
=
+
()
( )
()
( )t
V
t
V
t
V
t
V
EBn
Cn
RS
C
−
+
−
=



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