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FAN103 데이터시트(PDF) 2 Page - Fairchild Semiconductor

부품명 FAN103
상세설명  Primary Side Regulated (PSR) Flyback Converter
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN103 데이터시트(HTML) 2 Page - Fairchild Semiconductor

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AN-8033
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 5/6/10
2
2. Operation Principle of Primary-
Side Regulation
Figure 2 shows the simplified circuit diagram of a primary-
side regulated flyback converter and its typical waveforms
are shown in Figure 3. Generally, discontinuous
conduction mode (DCM) operation is preferred for
primary-side regulation since it allows better output
regulation. The key of primary-side regulation is how to
obtain output voltage and current information without
directly sensing them. Once these values are obtained, the
control can be accomplished by the conventional feedback
compensation method.
The operation principles of DCM flyback converter are as
follows:
During the MOSFET ON time (tON), input voltage
(VDL) is applied across the primary-side inductor (Lm).
Then, MOSFET current (Ids) increases linearly from
zero to the peak value (Ipk). During this time, the
energy is drawn from the input and stored in the
inductor.
When the MOSFET is turned off, the energy stored in
the inductor forces the rectifier diode (D) to be turned
on. During the diode conduction time (tD), the output
voltage (Vo), together with diode forward-voltage drop
(VF), are applied across the secondary-side inductor
(L
m×Ns
2/ N
p
2) and the diode current (ID) decreases
linearly from the peak value (I
pk× Np/Ns) to zero. At
the end of tD, all the energy stored in the inductor has
been delivered to the output.
When the diode current reaches zero, the transformer
auxiliary winding voltage (Vw) begins to oscillate by
the resonance between the primary-side inductor (Lm)
and the MOSFET output capacitor.
During the diode conduction time, the sum of output
voltage and diode forward-voltage drop is reflected to the
auxiliary winding side as (Vo+VF)× N
a/Ns. Since the diode
forward-voltage drop decreases as current decreases, the
auxiliary winding voltage reflects the output voltage best
at the end of diode conduction time where the diode
current diminishes to zero. By sampling the winding
voltage at the end of the diode conduction time, the output
voltage information can be obtained. The internal error
amplifier for output voltage regulation (EA_V) compares
the sampled voltage with internal precise reference to
generate an error voltage (VCOMV), which determines the
duty cycle of the MOSFET, as shown in Figure 2.
Meanwhile, the output current can be estimated through
calculation. Assuming that output current is same as the
average of the diode current in steady state, the output
current can be estimated as:
S
D
S
P
PK
O
t
2
t
N
N
I
I
=
(1)
The output current estimator picks up the peak value of the
drain current with a peak detection circuit and calculates
the output current using the diode conduction time (tD) and
switching period (ts). These output information is
compared with internal precise reference to generate error
voltage (VCOMI), which determines the duty cycle of the
MOSFET, as shown in the block diagram of Figure 2.
Among the two error voltages, VCOMV and VCOMI, the
smaller one actually determines the duty cycle. Therefore,
during constant voltage regulation mode, VCOMV determines
the duty cycle while VCOMI is saturated to HIGH. During
constant current regulation mode, VCOMI determines the duty
cycle while VCOMV is saturated to HIGH.
Figure 2. Primary-Side Regulated Flyback Converter
p
pk
s
N
I
N
pk
I
.
D avg
o
I
I
=
a
F
s
N
V
N
a
O
s
N
V
N
Figure 3. Key Waveforms of Primary-Side Regulated
Flyback Converter


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