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VB409SP Datasheet(PDF) 6 Page - STMicroelectronics

Part # VB409SP
Description  HIGH VOLTAGE REGULATOR POWER I.C.
PDF  9 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VB409SP Datasheet(HTML) 6 Page - STMicroelectronics

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VB409 / VB409SP
1
AVERAGE POWER CALCULATION IN WORST
CASE
As before explained, the device also senses the
preregulator voltage (Vcap), so that as soon as the
capacitor reaches its maximum voltage, the
trilinton reduces the current so limiting furtherly
power dissipation. On the contrary if the capacitor
doesn’t reach the maximum value, the trilinton
supplies current at a steady value (Imax) during the
whole conduction angle. This is obviously the
worst
case,
in
which
the
average
power
dissipation is maximum.
VIN
t
IIN
ICL(in)
Assuming that
are the conduction angles, it results:
As for t1:
it follows:
Where
0
t1
[,
]
t2 T
2
---
[, ]
=
P AV
1
T
--
VIN IIN
⋅
() t
d
0
T
∫⋅
=
=
1
T
--
VIN ICL in
()
⋅
() t
d
0
t1
∫
V IN I CL in
()
⋅
() t
d
t2
T
2
--
∫
+
⋅
ICL in
()
Vmax
⋅
T
---------------------------
2
π
T
----- t
⋅
()
sin
t
d
0
t1
∫
2
π
T
----- t
⋅
()
sin
t
d
t2
T
2
---
∫
+
⋅
==
I CL in
()
V max
⋅
T
---------------------------
2
2
π
T
----- t
⋅
()
sin
t
d
0
t1
∫
⋅
=
2
I CL i n
()
Vmax
⋅
T
---------------------------
T
2
π
-----
2
π
T
----- t1
⋅
()
cos
–
0
cos
+
[]
⋅⋅
=
=
=
ICL in
()
V max
⋅
π
--------------------------- 11
2
π
T
----- t1
⋅
()
sin
2
–
–
ICL in
()
Vmax
⋅
π
---------------------------
11
V1
Vmax
----------


2
–
–
⋅
V 1
Vmax
----------
2
π
T
----- t1
⋅
()
sin
=
PAV =
V1
vmax
0
t1
t2
T/2
T
t
V IN
Vmax
2
π
T
----- t
⋅
()
sin
⋅
=
0
t
T
2
---
≤≤
T
2
---
tT
≤≤
0
IIN
ICL in
()
⋅
=
0
tt1
≤≤
t2
t
T
2
--
≤≤
0
elsewhere
V 1
Vref 1
1
R1
R2
--------
+
()
⋅
=
=
Figure 3a
Figure 3b
t
Vcap



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