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AN3400 Datasheet(PDF) 49 Page - STMicroelectronics

No. de pieza AN3400
Descripción Electrónicos  Analysis and simulation of a BJT complementary pair in a self-oscillating CFL solution
PDF  78 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3400 Datasheet(HTML) 49 Page - STMicroelectronics

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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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