数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

FCA20N60S 数据表(PDF) 9 Page - Fairchild Semiconductor

部件名 FCA20N60S
功能描述  PFCPWM Combination Controller
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FCA20N60S 数据表(HTML) 9 Page - Fairchild Semiconductor

Back Button FCA20N60S Datasheet HTML 5Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 6Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 7Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 8Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 9Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 10Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 11Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 12Page - Fairchild Semiconductor FCA20N60S Datasheet HTML 13Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 17 page
background image
AN-8027
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 8/26/09
9
It is typical to set the maximum power limit of PFC stage
around 1.2~1.5 of its nominal power such that the VEA is
around 4~4.5V at nominal output power. By adjusting the
current-sensing resistor for PFC stage, the maximum power
limit of PFC stage can be programmed.
To filter out the current ripple of switching frequency, an
RC filter is typically used for ISENSE pin. RLF1 should not
be larger than 100Ω and the cut-off frequency of filter
should be 1/2~1/6 of the switching frequency.
Diodes D1 and D2 are required to prevent over-voltage on
ISENSE pin due to the inrush current that might damage
the IC. A fast recovery diode or ultra fast recovery diode is
recommended.
Figure 16. Gain Modulation Block
(Design Example)
Setting the maximum power limit
of PFC stage as 450W, the current sensing resistor is
obtained as:
2
23
.
1
6
72 9 5.7 10
0.098
610 450
MAX
LINE BO
M
CS
MAX
IAC BOUT
VG
R
R
RP
⋅⋅
⋅⋅
×
==
=
Ω
×⋅
Thus, 0.1
Ω resistor is selected.
[STEP-8] PFC Current Loop Design
The transfer function from duty cycle to the inductor
current of boost power stage is given as:
=
)
)
BOUT
L
BOOST
V
i
sL
d
(29)
The transfer function from the output of the current control
error amplifier to the inductor current-sensing voltage is
obtained as:
11
=
)
)
CS
CS
BOUT
IEA
RAMP
BOOST
vR
V
vV
sL
(30)
where VRAMP is the peak to peak voltage of ramp signal for
current control PWM comparator, which is 2.55V.
The transfer function of the compensation circuit is given as:
1
1
2
2
1
2
IC
IEA
II
CS
IP
s
f
vf
s
vs
f
π
π
π
+
=⋅
+
)
)
(31)
where:
11
2
1
,
22
1
2
MI
II
IZ
IC
IC
IC
IP
IC
IC
G
f
fand
CR
C
f
RC
ππ
π
==
⋅⋅
=
⋅⋅
(32)
The procedure to design the feedback loop is as follows:
(a) Determine the crossover frequency (fIC) around
1/10~1/6 of the switching frequency. Then calculate
the gain of the transfer function of Equation (30) at
crossover frequency as:
11
@
2
IC
CS
CS
BOUT
IEA
RAMP
IC
BOOST
ff
vR
V
vV
f
L
π
=
=
⋅⋅
)
)
(33)
(b) Calculate RIC that makes the closed loop gain unity at
crossover frequency:
1
@
1
IC
IC
CS
MI
IEA
ff
R
v
G
v
=
=
)
)
(34)
(c) Since the control-to-output transfer function of power
stage has -20dB/dec slope and -90o phase at the
crossover frequency is 0dB, as shown in Figure 17; it
is necessary to place the zero of the compensation
network (fIZ) around 1/3 of the crossover frequency so
that more than 45
° phase margin is obtained. Then the
capacitor CIC1 is determined as:
1
1
2/ 3
IC
IC
C
C
Rf
π
=
(35)
(d) Place compensator high-frequency pole (fCP) at least a
decade higher than fIC to ensure that it does not
interfere with the phase margin of the current loop at
its crossover frequency.
2
1
2
IC
IP
IC
C
fR
π
=
⋅⋅
(36)


类似零件编号 - FCA20N60S

制造商部件名数据表功能描述
logo
Fairchild Semiconductor
FCA20N60S FAIRCHILD-FCA20N60S Datasheet
970Kb / 9P
   600V N-Channel MOSFET
FCA20N60S FAIRCHILD-FCA20N60S Datasheet
682Kb / 15P
   Power Factor Correction Converter Design
logo
Inchange Semiconductor ...
FCA20N60S ISC-FCA20N60S Datasheet
347Kb / 2P
   isc N-Channel MOSFET Transistor
logo
Fairchild Semiconductor
FCA20N60S-F109 FAIRCHILD-FCA20N60S-F109 Datasheet
970Kb / 9P
   600V N-Channel MOSFET
FCA20N60S-F109 FAIRCHILD-FCA20N60S-F109 Datasheet
298Kb / 14P
   DESIGN/PROCESS CHANGE NOTIFICATION
More results

类似说明 - FCA20N60S

制造商部件名数据表功能描述
logo
Fairchild Semiconductor
FAN4800AU FAIRCHILD-FAN4800AU Datasheet
987Kb / 20P
   PFC/ PWM Controller Combination
FAN4800A FAIRCHILD-FAN4800A_09 Datasheet
647Kb / 24P
   PFC/PWM Controller Combination
FAN4800AS FAIRCHILD-FAN4800AS Datasheet
583Kb / 19P
   PFC/PWM Controller Combination
FAN4800AUN FAIRCHILD-FAN4800AUN Datasheet
987Kb / 20P
   PFC/ PWM Controller Combination
FAN4800A FAIRCHILD-FAN4800A Datasheet
659Kb / 24P
   PFC/PWM Controller Combination
FAN3988IL6X-F113 FAIRCHILD-FAN3988IL6X-F113 Datasheet
992Kb / 21P
   PFC/ PWM Controller Combination
logo
Texas Instruments
UCC28500-12 TI1-UCC28500-12 Datasheet
914Kb / 35P
[Old version datasheet]   BiCMOS PFC/PWM COMBINATION CONTROLLER
UCC28521 TI1-UCC28521_16 Datasheet
790Kb / 34P
[Old version datasheet]   ADVANCED PFC/PWM COMBINATION CONTROLLER
UCC28500 TI-UCC28500 Datasheet
571Kb / 31P
[Old version datasheet]   BICMOS PFC/PWM COMBINATION CONTROLLER
UCC18500 TI-UCC18500 Datasheet
91Kb / 8P
[Old version datasheet]   BiCMOS PFC/PWM Combination Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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