Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

FAN7930B Datasheet(PDF) 16 Page - Fairchild Semiconductor

Part # FAN7930B
Description  Critical Conduction Mode PFC Controller
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN7930B Datasheet(HTML) 16 Page - Fairchild Semiconductor

Back Button FAN7930B Datasheet HTML 12Page - Fairchild Semiconductor FAN7930B Datasheet HTML 13Page - Fairchild Semiconductor FAN7930B Datasheet HTML 14Page - Fairchild Semiconductor FAN7930B Datasheet HTML 15Page - Fairchild Semiconductor FAN7930B Datasheet HTML 16Page - Fairchild Semiconductor FAN7930B Datasheet HTML 17Page - Fairchild Semiconductor FAN7930B Datasheet HTML 18Page - Fairchild Semiconductor FAN7930B Datasheet HTML 19Page - Fairchild Semiconductor FAN7930B Datasheet HTML 20Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 16 / 22 page
background image
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN7930B • Rev. 1.0.2
16
10. Input Voltage Absent Detection: To save power
loss caused by input voltage sensing resistors and to
optimize THD easily, the FAN7930B omits AC input
voltage detection. Therefore, no information about AC
input is available from the internal controller. In many
cases, the VCC of PFC controller is supplied by an
independent power source like standby power. In this
scheme, some mismatch may exist. For example, when
the electric power is suddenly interrupted during two or
three AC line periods; VCC is still alive during that time,
but output voltage drops because there is no input
power source. Consequently, the control loop tries to
compensate for the output voltage drop and VCOMP
reaches its maximum. This lasts until AC input voltage is
live again. When AC input voltage is live again, high
VCOMP allows high switching current and more stress is
put on the MOSFET and diode. To protect against this,
FAN7930B internally checks if the input AC voltage
exists. If input does not exist, soft-start is reset and
waits until AC input is live again. Soft-start manages the
turn-on time for smooth operation when it detects AC
input is applied again and applies less voltage and
current stress on startup.
Figure 41.
Operation without Input Voltage
Absent Circuit
VIN
t
VOUT
VAUX
MOSFET Gate
IDS
fMIN
DMAX
Input Voltage Absent Detected
NewVCOMP
Though VIN is eliminated,
operation of controller is
normal due to the large
bypass capacitor.
FAN7930 Rev.00
fMIN
DMIN
Smooth Soft-
Start
Figure 42. Operation with Input Voltage
Absent Circuit
11. Current Sense: The MOSFET current is sensed
using an external sensing resistor for the over-current
protection. If the CS pin voltage is higher than 0.8V, the
over-current
protection
comparator
generates
a
protection signal. An internal RC filter of 40kΩ and 8pF
is included to filter switching noise.
12. Gate Driver Output: FAN7930B contains a single
totem-pole output stage designed for a direct drive of
the power MOSFET. The drive output is capable of up
to +500/-800mA peak current with a typical rise and fall
time of 50ns with 1nF load. The output voltage is
clamped to 13V to protect the MOSFET gate even if the
VCC voltage is higher than 13V.


Similar Part No. - FAN7930B

ManufacturerPart #DatasheetDescription
logo
ON Semiconductor
FAN7930B ONSEMI-FAN7930B Datasheet
1Mb / 22P
   Critical Conduction Mode PFC Controller
September-2017, Rev. 2
FAN7930BMX-G ONSEMI-FAN7930BMX-G Datasheet
1Mb / 22P
   Critical Conduction Mode PFC Controller
September-2017, Rev. 2
More results

Similar Description - FAN7930B

ManufacturerPart #DatasheetDescription
logo
Fairchild Semiconductor
AN-6961 FAIRCHILD-AN-6961 Datasheet
434Kb / 8P
   Critical Conduction Mode PFC Controller
FAN7930C FAIRCHILD-FAN7930C Datasheet
916Kb / 22P
   Critical Conduction Mode PFC Controller
FAN7529 FAIRCHILD-FAN7529 Datasheet
1Mb / 20P
   Critical Conduction Mode PFC Controller
FAN7529 FAIRCHILD-FAN7529_07 Datasheet
1Mb / 20P
   Critical Conduction Mode PFC Controller
FAN7530 FAIRCHILD-FAN7530_07 Datasheet
1Mb / 20P
   Critical Conduction Mode PFC Controller
logo
ON Semiconductor
FAN7930B ONSEMI-FAN7930B Datasheet
1Mb / 22P
   Critical Conduction Mode PFC Controller
September-2017, Rev. 2
logo
Alpha & Omega Semicondu...
AOZ7111 AOSMD-AOZ7111 Datasheet
912Kb / 15P
   Critical Conduction Mode PFC Controller
logo
Fairchild Semiconductor
FAN7530 FAIRCHILD-FAN7530 Datasheet
2Mb / 20P
   Critical Conduction Mode PFC Controller
logo
ON Semiconductor
FAN7930C ONSEMI-FAN7930C Datasheet
982Kb / 22P
   Critical Conduction Mode PFC Controller
December-2017, Rev. 3
logo
Fairchild Semiconductor
FAN7930MX FAIRCHILD-FAN7930MX Datasheet
1Mb / 22P
   FAN7930 Critical Conduction Mode PFC Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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