Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

FAN103MY Datenblatt(PDF) 10 Page - Fairchild Semiconductor

Teilenummer FAN103MY
Bauteilbeschribung  Primary-Side-Regulation PWM Controller
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN103MY Datenblatt(HTML) 10 Page - Fairchild Semiconductor

Back Button FAN103MY Datasheet HTML 6Page - Fairchild Semiconductor FAN103MY Datasheet HTML 7Page - Fairchild Semiconductor FAN103MY Datasheet HTML 8Page - Fairchild Semiconductor FAN103MY Datasheet HTML 9Page - Fairchild Semiconductor FAN103MY Datasheet HTML 10Page - Fairchild Semiconductor FAN103MY Datasheet HTML 11Page - Fairchild Semiconductor FAN103MY Datasheet HTML 12Page - Fairchild Semiconductor FAN103MY Datasheet HTML 13Page - Fairchild Semiconductor FAN103MY Datasheet HTML 14Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN103 • Rev. 1.0.1
10
Functional Description
0 shows the basic circuit diagram of a primary-side
regulated flyback converter with typical waveforms
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), are
applied across the secondary-side inductor (Lm
×Ns2/
Np2) 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 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 same as average of the
diode current in steady state.
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 inductor
discharge time (tDIS) 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 in CC mode.
Among the two error voltages, VCOMV and VCOMI, the
small one 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.
+
V
DL
-
L
m
+
V
O
-
N
p:Ns
I
ds
I
D
D
Primary-Side Regulation
Controller
+
V
w
-
VDD
Gate
Vs
CS
+V
F -
N
A
L
O
A
D
I
o
Io
Estimator
Vo
Estimator
t
DIS
Detector
PWM
Control
R
CS
VAC
Ref
Ref
EA_V
EA_I
V
COMV
V
COMI
R
S1
R
S2
Figure 21. 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 22.
Key Waveforms of DCM Flyback
Converter


Ähnliche Teilenummer - FAN103MY

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Fairchild Semiconductor
FAN103MY FAIRCHILD-FAN103MY Datasheet
667Kb / 16P
   Primary-Side-Regulation PWM Controller (PWM-PSR)
More results

Ähnliche Beschreibung - FAN103MY

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
ON Semiconductor
FL663 ONSEMI-FL663 Datasheet
406Kb / 15P
   Primary-Side-Regulation PWM Controller
June 2015 Rev. 1.0
logo
Fairchild Semiconductor
FAN103 FAIRCHILD-FAN103_10 Datasheet
667Kb / 16P
   Primary-Side-Regulation PWM Controller (PWM-PSR)
logo
ON Semiconductor
FL7740 ONSEMI-FL7740 Datasheet
657Kb / 16P
   Constant-Voltage Primary-Side-Regulation PWM Controller
April 2017 - Rev. P0
FL6630 ONSEMI-FL6630 Datasheet
453Kb / 14P
   Single-Stage Primary-Side-Regulation PWM Controller
May 2015 Rev. 1.0
FL7740 ONSEMI-FL7740_18 Datasheet
344Kb / 14P
   Constant-Voltage Primary-Side-Regulation PWM Controller
February 2018 - Rev. 3
FL7734 ONSEMI-FL7734 Datasheet
380Kb / 14P
   Single-Stage Primary-Side-Regulation PWM Controller
November 2014 Rev. 1.0
FL7730 ONSEMI-FL7730 Datasheet
896Kb / 15P
   Single-Stage Primary-Side-Regulation PWM Controller
October 2012 Rev. 1.0.8
logo
Fairchild Semiconductor
FL103 FAIRCHILD-FL103 Datasheet
1Mb / 14P
   Primary-Side-Regulation PWM Controller for LED Illumination
logo
Unisonic Technologies
US1651 UTC-US1651 Datasheet
178Kb / 7P
   PRIMARY-SIDE REGULATION PWM POWER SWITCH
USR1652 UTC-USR1652 Datasheet
167Kb / 7P
   PRIMARY-SIDE REGULATION PWM POWER SWITCH
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com