Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

FAN48610UC50X Scheda tecnica(PDF) 9 Page - Fairchild Semiconductor

Il numero della parte FAN48610UC50X
Spiegazioni elettronici  2.5 MHz, Fixed-Output Synchronous TinyBoost Regulator
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN48610UC50X Scheda tecnica(HTML) 9 Page - Fairchild Semiconductor

Back Button FAN48610UC50X Datasheet HTML 5Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 6Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 7Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 8Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 9Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 10Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 11Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 12Page - Fairchild Semiconductor FAN48610UC50X Datasheet HTML 13Page - Fairchild Semiconductor  
Zoom Inzoom in Zoom Outzoom out
 9 / 13 page
background image
© 2013 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN48610 • Rev. 1.0.0 •
9
Circuit Description
FAN48610 is a synchronous boost regulator, typically
operating at 2.5 MHz in Continuous Conduction Mode
(CCM), which occurs at moderate to heavy load current and
low VIN voltages. The regulator’s Pass-Through Mode
automatically activates when VIN is above the boost
regulator’s set point.
Table 2.
Operating Modes
Mode
Description
Invoked When:
LIN
Linear Startup
VIN > VOUT
SS
Boost Soft-Start
VIN < VOUT < VOUT(TARGET)
BST
Boost Operating Mode
VOUT= VOUT(TARGET)
PT
Pass-Through Mode
VIN > VOUT(TARGET)
Boost Mode Regulation
The FAN48610 uses a current-mode modulator to achieve
excellent transient response and smooth transitions between
CCM and DCM operation. During CCM operation, the device
maintains a switching frequency of about 2.5 MHz. In light-
load operation (DCM), frequency is naturally reduced to
maintain high efficiency.
Shutdown and Startup
When EN is LOW, all bias circuits are off and the regulator is
in Shutdown Mode. During shutdown, current flow is
prevented from VIN to VOUT, as well as reverse flow from
VOUT to VIN. It is recommended to keep load current draw
below 500 mA until the devices successfully executes
startup. The following table describes the startup sequence.
Table 3.
Boost Startup Sequence
Start
Mode
Entry
Exit
End
Mode
Timeout
(µs)
LIN1
VIN > VUVLO,
EN=1
VOUT > VIN-
300 mV
SS
TIMEOUT
LIN2
512
LIN2
LIN1 Exit
VOUT > VIN-
300 mV
SS
TIMEOUT
FAULT
1024
SS
LIN1 or LIN2
Exit
VOUT=VOUT(TARG
ET)
BST
OVERLOAD
TIMEOUT
FAULT
64
LIN Mode
When EN is HIGH and VIN > VUVLO, the regulator first
attempts to bring VOUT within 300 mV of VIN by using the
internal fixed-current source from VIN (Q2). The current is
limited to the LIN1 set point.
If VOUT reaches VIN-300 mV during LIN1 Mode, the SS Mode
is initiated. Otherwise, LIN1 times out after 512
µs and LIN2
Mode is entered.
In LIN2 Mode, the current source is incremented to 1.6 A. If
VOUT fails to reach VIN-300 mV after 1024 µs, a fault
condition is declared and the device waits 20 ms to attempt
an automatic restart.
Soft-Start
(SS) Mode
Upon the successful completion of LIN Mode (VOUT>VIN-
300 mV), the regulator begins switching with boost pulses
current limited to 50% of nominal level.
During SS Mode, if VOUT fails to reach regulation during the
SS ramp sequence for more than 64
µs, a fault is declared. If
large COUT is used, the reference is automatically stepped
slower to avoid excessive input current draw.
Boost (BST) Mode
This is a normal operating mode of the regulator.
Pass-Through (PT) Mode
In normal operation, the device automatically transitions from
Boost Mode to Pass-Through Mode if VIN goes above the
target VOUT. In Pass-Through Mode, the device fully
enhances Q2 to provide a very low impedance path from
VIN to VOUT. Entry to the Pass-Through Mode is triggered
by condition where VIN > VOUT and no switching has occurred
during the past 5 µs. To soften the entry into Pass-Through
Mode, Q2 is driven as a linear current source for the first
5 µs. Pass-Through Mode exit is triggered when VOUT
reaches the target VOUT voltage. During Automatic Pass-
Through Mode, the device is short-circuit protected by a
voltage comparator tracking the voltage drop from VIN to
VOUT; if the drop exceeds 300 mV, a fault is declared.
Fault State
The regulator enters Fault State under any of the following
conditions:
V
OUT fails to achieve the voltage required to advance
from LIN Mode to SS Mode.
V
OUT fails to achieve the voltage required to advance
from SS Mode to BST Mode.
Boost current limit triggers for 2 ms during BST Mode.
V
IN – VOUT > 300 mV; this fault can occur only after
successful completion of the soft-start sequence.
V
IN < VUVLO.
Once a fault is triggered, the regulator stops switching and
presents a high-impedance path between VIN and VOUT.
After waiting 20 ms, an automatic restart is attempted.
Over-Temperature
The regulator shuts down if the die temperature exceeds
150°C. Restart occurs
when the IC has cooled by
approximately 20°C.


Codice articolo simile - FAN48610UC50X

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
ON Semiconductor
FAN48610UC50X ONSEMI-FAN48610UC50X Datasheet
775Kb / 12P
   2.5 MHz, Fixed-Output Synchronous TinyBoost Regulator
August 2015 Rev. 1.5
More results

Descrizione simile - FAN48610UC50X

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
ON Semiconductor
FAN48610 ONSEMI-FAN48610 Datasheet
775Kb / 12P
   2.5 MHz, Fixed-Output Synchronous TinyBoost Regulator
August 2015 Rev. 1.5
FAN48695 ONSEMI-FAN48695 Datasheet
620Kb / 14P
   Synchronous Regulator, TINYBOOST, 2.5 MHz
March, 2020 ??Rev. 1
FAN48685 ONSEMI-FAN48685 Datasheet
470Kb / 12P
   Fixed-Output Synchronous TinyBoost Regulator
July, 2018 ??Rev. 0
FAN48619 ONSEMI-FAN48619 Datasheet
1Mb / 12P
   Fixed-Output Synchronous TinyBoost Regulator
December 2015 Rev. 1.0
FAN48614 ONSEMI-FAN48614 Datasheet
527Kb / 4P
   Fixed-Output Synchronous TinyBoost Regulator
July 2015 Rev. 1.4
FAN48615 ONSEMI-FAN48615 Datasheet
1Mb / 12P
   Fixed-Output Synchronous TinyBoost Regulator
September 2016 Rev. 1.0
FAN48617 ONSEMI-FAN48617 Datasheet
1Mb / 11P
   Fixed-Output Synchronous TinyBoost Regulator
August 2016 Rev.1.0
FAN48611 ONSEMI-FAN48611 Datasheet
1Mb / 14P
   2.5 MHz, Fixed-Output, Synchronous Tiny Boost Regulator
June 2017 Rev. 1.2
FAN4860 ONSEMI-FAN4860 Datasheet
1Mb / 21P
   3 MHz, Synchronous TinyBoost Regulator
February 2014 Rev. 1.1.1
FAN4868 ONSEMI-FAN4868 Datasheet
309Kb / 12P
   3 MHz, Synchronous TinyBoost Regulator
October, 2018 ??Rev. 3
More results


Html Pages

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


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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