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L6563ATR Datenblatt(PDF) 24 Page - STMicroelectronics

Teilenummer L6563ATR
Bauteilbeschribung  ADVANCED TRANSITION-MODE PFC CONTROLLER
PDF  37 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6563ATR Datenblatt(HTML) 24 Page - STMicroelectronics

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Application information
L6563 - L6563A
24/37
5.
Check that the maximum current sourced by the TBO pin (pin 6) does not exceed the
maximum specified (0.25mA):
Equation 10
In the following Mathcad® sheet, as an example, the calculation is shown for the circuit
illustrated in Figure 39 shows the internal block diagram of the tracking boost function.
Design data
Vin1 := 88V
Vo1:= 200V
Vin2 := 264V
Vo2:= 385V
Vox ;= 400V
∆Vo ;= 40V
Step 1
choose: Vinx: = 270V
Step 2
Step 3
I
TBOmax
3
R
T
------- 0.25
10
3
–
⋅
≤
=
Vin
clamp:
Vox
Vo
1
–
Vo
2
Vo
1
–
---------------------------
Vin
2
⋅
=
Vox
Vo
2
–
Vo
2
Vo
1
–
---------------------------
Vin
1
⋅
–
Vinclamp = 278.27V
k:
3
2Vin
x
⋅
--------------------------
=
k = 7.857 x 10-3
R1:
Vo
∆
20
-----------
10
6
⋅
=
R1 = 2 x 106
Ω



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