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AN2794 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza AN2794
Descripción Electrónicos  This application note provides design guidelines
PDF  39 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2794 Datasheet(HTML) 13 Page - STMicroelectronics

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AN2794
Design considerations
Doc ID 14827 Rev 2
13/39
●
HF transformer design
The design method is based on the Kg core geometry approach. The design can be done
according to the specifications in Table 3.
The first step is to compute the transformer apparent power given by:
Equation 28
The second step is the electrical condition parameter calculation Ke:
Equation 29
where Kf=4 is the waveform coefficient (for square waves).
Equation 30
The next step is to calculate the core geometry parameter:
Equation 31
Table 3.
HF transformer design parameters
Specification
Symbol
Value
Nominal input voltage
Vin
24 V
Maximum input voltage
Vinmax
28 V
Minimum input voltage
Vinmin
20 V
RMS input current
Iin
41.4 A
Nominal output voltage
Vout
350 V
Output current
Iout
2.86 A
Switching frequency
f
100 kHz
Efficiency
η
98%
Regulation
α
0.05%
Max operating flux density
Bm
0.05T
Window utilization
Ku
0.3
Duty cycle
Dmax
0.45
Temperature rise
Tr
30 °C
W
2021
I
V
)
1
1
(
P
P
P
0
0
0
0
t
=
+
η
=
+
η
=
()4
2
m
2
2
f
e
10
B
f
K
145
.
0
K
-
•
•
•
=
()
5800
10
)
05
.
0
(
)
000
.
100
(
)
4
(
145
.
0
K
4
2
2
2
e
=
=
-
5
e
t
g
cm
348
.
0
K
2
P
K
=
α
=



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