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FAN6300H Datasheet(PDF) 4 Page - Fairchild Semiconductor

No. de pieza FAN6300H
Descripción Electrónicos  Highly Integrated Quasi-Resonant PWM Controller
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6300H Datasheet(HTML) 4 Page - Fairchild Semiconductor

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AN-6300
APPLICATION NOTE
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2 • 5/21/10
4
To determine the primary-side inductance (LP), the
following variables should be determined beforehand:
The minimum switching frequency (
fs,min): The
maximum average input current occurs at the
minimum input voltage and full-load condition.
Meanwhile, the switching frequency is at minimum
value during QR operation.
The falling time of the MOSFET drain voltage (tf):
As shown in Figure 4, the falling time of MOSFET
drain voltage is half of the resonant period of the
MOSFET effective output capacitance and primary-
side inductance. If a resonant capacitor is added to be
paralleled with Coss, tf can be increased and EMI can
be reduced. However, this forces a switching loss
increase. The typical value of tf for NB adaptor
application is about 0.5~1μs.
After determining fs,min and tf, the maximum duty cycle is
calculated as:
××
od
max
s,min
f
od
in
nV +V
D(1 - f
t )
n V +V +V
()
=
()
(3)
where Vin,min is specified at low-line and full-load.
According to Equation 1, the maximum average input
current Iin,max is determined as
oo
in,max
in,min
VI
I
V
η
=
(4)
According to Figure 3, Iin,max can be obtained as:
=
pk
in,max
max ds,max
1
ID I
2
(5)
Ids,max
pk can be determined as:
=
pk
in,min
max
ds,max
ms,min
VD
I
Lf
(6)
In Equation 5, replace Ids,max
pk by Equation 6, then
combine Equations 4 and 5 to obtain LP:
2
in,min
max
P
in s,min
(V
D
L
2P f
)
=
(7)
where Pin, and Dmax are specified in Equations 1 and 3,
respectively, and fs,min is the minimum switching
frequency.
Once LP is determined, the RMS current of the MOSFET
in normal operation are obtained as:
rms
peak
max
ds,max
ds,max
D
II
3
=
(8)
[d] Determine the Proper Core and the
Minimum Primary Turns
When designing the transformer, consider the maximum
flux density swing in normal operation (Bmax). The
maximum flux density swing in normal operation is
related to the hysteresis loss in the core, while the
maximum flux density in transient is related to the core
saturation.
From Faraday’s law, the minimum number of turns for the
transformer primary side is given by:
×
pk
6
Pds,max
P,min
max
e
LI
N10
BA
=
(9)
where:
LP
is
specified
in
Equation
7;
Ids,max
pk is the peak drain current specified in Equation 6;
Ae is the cross-sectional area of the core in mm
2; and
Bmax is the maximum flux density swing in tesla.
Generally, it is possible to use Bmax =0.25~0.30 T.
Determine the Number of Turns for Auxiliary
Winding
The number of turns for auxiliary winding (Na) can be
obtained by:
DD
D1
a
od
V+V
N=
V+V
(10)
where:
VDD is
the
operating
voltage
for
VDD
pin;
VD1 is the forward voltage drop of D1 in Figure 5; and
Vo and Vd as determined in Equation 2.


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