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FAN100 Datasheet(PDF) 10 Page - Fairchild Semiconductor

No. de pieza FAN100
Descripción Electrónicos  Primary-Side-Control PWM Controller
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN100 Datasheet(HTML) 10 Page - Fairchild Semiconductor

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© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN100 Rev. 1.0.2
10
Functional Description
0 shows the basic circuit diagram of a primary-side
regulated flyback converter and its typical waveforms
are shown in 0. Generally, discontinuous conduction
mode (DCM) operation is preferred for primary-side
regulation since it allows better output regulation. 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. While the diode is conducting, the output voltage
(Vo), together with diode forward-voltage drop (VF), is
applied across the secondary-side inductor (Lm×Ns
2/
Np
2) and the diode current (ID) decreases linearly from
the peak value (Ipk× Np/Ns) to zero. At the end of
inductor current discharge time (tDIS), 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 effective capacitor loaded across the MOSFET.
During the inductor current discharge time, the sum of
output voltage and diode forward-voltage drop is
reflected to the auxiliary winding side as (Vo+VF)× Na/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. Thus,
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 error voltage
(VCOMV), which determines the duty cycle of the
MOSFET in CV mode.
Meanwhile, the output current can be estimated using
the peak drain current and inductor current discharge
time since output current is the same as average of the
diode current in steady state.
The output current estimator detects the peak value of
the drain current with a peak detection circuit and
calculates the output current using the inductor
discharge time (tDIS) and switching period (ts). This
output information is compared with the internal precise
reference to generate error voltage (VCOMI), which
determines the duty cycle of the MOSFET in CC mode.
With
Fairchild’s
innovative
technique,
TRUECURRENT™, constant current (CC) output can
be precisely controlled.
Of the two error voltages, VCOMV and VCOMI, the smaller
determines the duty cycle. 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 23. Simplified PSR Flyback Converter Circuit
P
pk
S
N
I
N
pk
I
.
Davg
o
I
I
=
A
F
S
N
V
N
A
O
S
N
V
N
Figure 24. Key Waveforms of DCM Flyback
Converter


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