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SB380 Datasheet(PDF) 4 Page - Fairchild Semiconductor

No. de pieza SB380
Descripción Electrónicos  Power Switch (FPS?? FSL1x7 to Low- Power Supplies
Download  12 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

SB380 Datasheet(HTML) 4 Page - Fairchild Semiconductor

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AN-9719
APPLICATION NOTE
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 11/2/10
4
3. Design Example
Flyback converters have two kinds of operation modes;
Continuous Conduction Mode (CCM) and Discontinuous
Conduction Mode (DCM). Each has its own advantages and
disadvantages. In general, DCM generates lower stress for
the rectifier diodes, since the diodes are operating at zero
current just before becoming reverse biased and the reverse
recovery loss is minimized. The transformer size can be
reduced using DCM because the average energy storage is
low compared to CCM. However, DCM causes high RMS
current, which severely increases the conduction loss of the
MOSFET for low line condition. For standby auxiliary
power supply applications with low output voltage and
minimal reverse recovery of Schottky diode, it is typical to
design the converter such that the converter operates in
CCM to maximize efficiency.
This section presents a design procedure using the Figure 1
schematic as a reference. An offline SMPS with 12W
nominal output power has been selected as the example.
[STEP-1] Define the System Specifications
When
designing
a
power
supply,
the
following
specifications should be determined first:
Line Voltage Range (
V
and
V
)
Line Frequency (
fL)
Nominal Output Power (
PO)
Estimate
Efficiencies
for
Nominal
Load
(
η).
The power conversion efficiency must be estimated to
calculate the input power for nominal load condition. If
no reference data is available, set
η = 0.7~0.75 for low-
voltage output applications and
η = 0.8~0.85 for high-
voltage output applications.
With the estimated efficiency, the input power for peak
load condition is given by:
η
(1)
(Design Example)
The specifications of the target
system are:
V
90V
V
264V
Line frequency (
f ) = 60Hz
Nominal output power (
P ) = 12W (12V/1A)
Estimated efficiency (
η) = 0.8
η
12
0.8
15
[STEP-2] Determine Input Capacitor (CIN) and Input
Voltage Range
It is typical to select the input capacitor as 2~3
μF per watt
of peak input power for the universal input range (85-
265VRMS) and 1μF per watt of peak input power for the
European input range (195V-265VRMS). With the input
capacitor chosen, the minimum input capacitor voltage at
nominal-load condition is obtained as:
· 1
·
(2)
where DCH is the input capacitor charging duty ratio defined
in Figure 8, which is typically about 0.2.
The maximum input capacitor voltage is given as:
√2
(3)
Figure 8. Input Capacitor Voltage Waveform
(Design Example)
By choosing 20
μF for input
capacitor, the minimum input voltage for nominal load
is obtained as:
· 1
·
2 · 90
15 · 1
0.2
20 · 10
·60
79
The maximum input voltage is obtained as:
√2 ·
√2 · 264
373
[STEP-3] Determine the Reflected Output Voltage (VRO)
When the MOSFET is turned off, the input voltage (VIN),
together with the output voltage reflected to the primary
(VRO), are imposed across the MOSFET, as shown in Figure
9. With a given V
RO, the maximum duty cycle (DMAX) and
the nominal MOSFET voltage (VDS
NOM) are obtained as:
(4)
(5)
·
(6)


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