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AN3400 Datasheet(PDF) 28 Page - STMicroelectronics

Part # AN3400
Description  Analysis and simulation of a BJT complementary pair in a self-oscillating CFL solution
PDF  78 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3400 Datasheet(HTML) 28 Page - STMicroelectronics

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Steady-state stage-wise circuit analysis
AN3400
28/78
Doc ID 018840 Rev 1
Figure 18.
Seventh stage: PNP storage phase
According to the agreement of the previous image, the following equations are valid in the
driving section during the PNP storage time for t10<t<t11:
System of equations 9
where IBpnp-off is the coming-in current during the storage time of the PNP bipolar.
●
Stage 8: t11<t<t12: (dead time after the PNP conduction phase:
-VCpnpoff-char-VEBsatpnp <V(t)<0 with
)
At t11 instant, the current ILP in the load inductor has started to decay and the resonant
current is commutated from the PNP bipolar Q2 to the snubber capacitor Cs that charges.
As a result, the voltage on the common emitter node of the two switches increases linearly
AM09809v1
IBpnp
ICpnp
IEpnp
VECp
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
PNP storage phase
()
( )t
V
t
V
C
−
=
()
sat
EBp
EBp
V
t
V
−
=
()
sat
ECp
ECp
V
t
V
−
≥
()
()dt
t
I
C
1
V
t
V
11
t
10
t
Cn
n
2
Cnos
Cn
∫
−
=
where
()
−
=
10
Cn
2
Cnos
t
V
V
()
()dt
t
I
C
1
V
t
V
11
t
10
t
Cp
p
2
Cpos
Cp
∫
−
=
where
()
−
=
10
Cp
2
Cpos
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
Epnp
LP
Cn
Cp
off
Bpnp
=
−
=
−
=
−
where
()
( )t
I
t
I
Cpnp
LP
=
()
()
()
()
()t
V
t
V
t
V
t
V
t
V
EBp
EBn
Rb
Cp
Cn
−
=
=
+
with
()
( ) 0
t
V
t
V
BEn
EBn
>
−
=
( )
()
()
( )t
V
t
V
t
V
t
V
EBp
Cp
RS
C
+
+
−
=
()
() 0
t
V
dt
d
>



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