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AN2435 Datasheet(PDF) 13 Page - STMicroelectronics

Part # AN2435
Description  TM sepic converter in PFC pre-regulator
PDF  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2435 Datasheet(HTML) 13 Page - STMicroelectronics

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AN2435
Practical design example of a sepic converter
13/25
Figure 9.
Equivalent current source of the sepic converter
Figure 10.
Small signal model for the TM sepic converter
2
Practical design example of a sepic converter
A practical example of a sepic converter is described below.
2.1
Design specifications
For the input data, the design specifications are needed.
C1
Load
ID1AVG
C2
Load
Pk
I
e
ˆ
2 ⋅
2
r
ACRMS
V
g
ˆ
2 ⋅
+
-
O
Vˆ
Table 1.
Design specification
Quantity
Value
Mains voltage range: VINMIN (RMS) – VINMAX (RMS)
175 VACRMS - 265 VACRMS
Regulated DC output voltage
200 V
Rated Output Power: PO
65 W
Minimum switching frequency: fswmin
45 kHz
Maximum over-voltage admitted
: ∆V
OVP
40 V
Maximum output voltage ripple
∆V
O
20 V
Expected efficiency:
η
90 %
Maximum mains RMS current
I
INRMSMAX
P
O
η V
ACMIN
•
----------------------------
420mA
==



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