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AN-4150 Datasheet(PDF) 7 Page - Fairchild Semiconductor

Part # AN-4150
Description  Design Guidelines for Flyback Converters
Download  16 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

AN-4150 Datasheet(HTML) 7 Page - Fairchild Semiconductor

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AN-4150
APPLICATION NOTE
© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSQ-Series Rev. 1.0.0 10/23/06
7
Figure 11. Typical B-H Characteristics of Ferrite Core
(TDK/PC40)
Table 1. Core Quick selection Table (for Universal Input
Range, fs=55kHz and Single Output)
[STEP-7] Determine the Number of Turns for Each Output
Figure 12 shows the simplified diagram of the transformer.
First, determine the turns ratio (n) between the primary side
and the feedback-controlled secondary side as a reference.
where Np and Ns1 are the number of turns for primary side
and reference output, respectively, Vo1 is the output voltage
and VF1 is the diode (DR1) forward voltage drop of the refer-
ence output.
Then, determine the proper integer for Ns1 so that the
resulting Np is larger than the Np
min obtained from Equation
14. The number of turns for the other output (n-th output) is
determined by:
The number of turns for Vcc winding is determined as:
where Vcc* is the nominal value of the supply voltage of the
FPS device and VFa is the forward voltage drop of Da as
defined in Figure 12. It is typical to set Vcc* 3~4V below Vcc
maximum rating (refer to the datasheet).
Figure 12. Simplified Diagram of the Transformer
With the determined turns of the primary side, the gap length
of the core is obtained as:
where AL is the AL-value with no gap in nH/turns
2; A
e is the
cross-sectional area of the core in mm2, as shown in Figure
10; Lm is specified in Equation 7; and Np is the number of
turns for the primary-side of the transformer.
Output
Power
EI Core
EE Core
EPC Core
EER Core
0-10W
EI12.5
EI16
EI19
EE8
EE10
EE13
EE16
EPC10
EPC13
EPC17
10-20W
EI22
EE19
EPC19
20-30W
EI25
EE22
EPC25
EER25.5
30-50W
EI28
EI30
EE25
EPC30
EER28
50-70W
EI35
EE30
EER28L
100
500
400
300
200
800
1600
0
0
Magnetic field H (A/m)
Magnetization Curves (typical)
Material :PC40
100
°C
120
°C
60
°C
25
°C
n
NP
Ns1
---------
VRO
Vo1 VF1
+
--------------------------
==
(EQ 15)
Nsn
()
Von
()
VFn
()
+
Vo1 VF1
+
---------------------------------
=Ns1
turns
() (EQ 16)
Na
Vcc*VFa
+
Vo1 VF1
+
----------------------------
=Ns1
turns
()
(EQ 17)
Np
N
S1
-
V
RO
+
D
R1
N
a
D
a
N
S(n)
D
R(n)
+
V
O(n)
-
+
V
O1
-
+ V
F(n) -
+ V
F1 -
- V
Fa +
+
V
cc
*
-
G
0.4
π
× A
e
NP
2
10
9L
m
-----------------
1
AL
------
⎝⎠
⎜⎟
⎛⎞
=mm
() (EQ 18)


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