データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

RT5047BF データシート(PDF) 12 Page - Richtek Technology Corporation

部品番号 RT5047BF
部品情報  Single Output LNB Supply and Control Voltage Regulator
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  RICHTEK [Richtek Technology Corporation]
ホームページ  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT5047BF データシート(HTML) 12 Page - Richtek Technology Corporation

Back Button RT5047BF Datasheet HTML 8Page - Richtek Technology Corporation RT5047BF Datasheet HTML 9Page - Richtek Technology Corporation RT5047BF Datasheet HTML 10Page - Richtek Technology Corporation RT5047BF Datasheet HTML 11Page - Richtek Technology Corporation RT5047BF Datasheet HTML 12Page - Richtek Technology Corporation RT5047BF Datasheet HTML 13Page - Richtek Technology Corporation RT5047BF Datasheet HTML 14Page - Richtek Technology Corporation RT5047BF Datasheet HTML 15Page - Richtek Technology Corporation RT5047BF Datasheet HTML 16Page - Richtek Technology Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 12 / 17 page
background image
RT5047BF
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
DS5047BF-00
December
2017
12
where
D is the duty cycle and η is the boost converter
efficiency. Finally, take ESR into consideration, the
overall output ripple voltage can be determined by the
following equation :
OUT
OUT
IN
OUT
OSC
DI
V
= I
ESR
Cf

The output capacitor, COUT, should be selected
accordingly.
Time
Time
Inductor Current
Output Current
Output Ripple
Voltage (ac)
(1-D)TS
ΔVOUT1
ΔIL
Input Current
Figure 1. The Output Ripple Voltage without the
Contribution of ESR
Schottky Diode Selection
Schottky
diodes
are
chosen
for
their
low
forward-voltage
drop
and
fast
switching
speed.
However,
when
making
a
selection,
important
parameters such as power dissipation, reverse voltage
rating, and pulsating peak current should all be taken
into consideration. A s
uitable Schottky diode’s reverse
voltage rating must be greater than the maximum
output voltage and its average current rating must
exceed the average output current. The chosen diode
should also have a sufficiently low leakage current level,
since it increases with temperature.
Under-Voltage Lockout (UVLO)
The UVLO circuit compares the input voltage at VIN
with the UVLO threshold (7.7V rising typically) to
ensure that the input voltage is high enough for reliable
operation. The 350mV (typ.) hysteresis prevents supply
transients from causing a shutdown. Once the input
voltage exceeds the UVLO rising threshold, start-up
begins. When the input voltage falls below the UVLO
falling threshold, all IC internal functions will be turned
off by the controller.
Over-Current Protection
The RT5047BF features an over-current protection
function to prevent chip damage from high peak
currents. Both the boost converter and the linear
regulator have independent current limit.
(1) Boost
In the boost converter, this is achieved through
cycle-by-cycle internal current limit. During the
ON-period, the chip senses the inductor current
that is flowing into the LX pin. The internal NMOS
will be turned off if the peak inductor current
reaches the current-limit value of 3A (typ.).
(2) LNB
When the linear regulator exceeds 550mA (typ.)
more than 6ms, the LNB output will be disabled.
During this period of time, if the current limit
condition disappears, the OCP will be cleared and
the part restarts.
If the part is still in current limit after this time period,
the
linear
regulator
and
boost
converter
will
automatically
disable
to
prevent
the
part
from
overheating.
Short Circuit Protection
If the LNB output is shorted to ground, and more than
6ms, the RT5047BF will be disabled 1800ms then
enable automatically.
Over-Temperature Protection
When the junction temperature reaches the critical
temperature (typically 140°C), the boost converter and
the linear regulator are immediately disabled. When the
junction
temperature
cools
down
to
a
lower
temperature threshold specified, the RT5047BF will be
allowed to restart by normal start operation.
FAULT
FAULT is a open-drain input. If it is 0, it stands for fault
occurred. The FAULT provide the information to show
over-current and short circuit protection of the system.


同様の部品番号 - RT5047BF

メーカー部品番号データシート部品情報
logo
Richtek Technology Corp...
RT5047B RICHTEK-RT5047B Datasheet
925Kb / 17P
   Single Output LNB Supply and Control Voltage Regulator
More results

同様の説明 - RT5047BF

メーカー部品番号データシート部品情報
logo
Richtek Technology Corp...
RT5047A RICHTEK-RT5047A Datasheet
925Kb / 16P
   Single Output LNB Supply and Control Voltage Regulator
RT5070 RICHTEK-RT5070 Datasheet
825Kb / 13P
   Single Output LNB Supply and Control Voltage Regulator
RT5047 RICHTEK-RT5047 Datasheet
976Kb / 16P
   Single Output LNB Supply and Control Voltage Regulator
RT5047 RICHTEK-RT5047_17 Datasheet
902Kb / 16P
   Single Output LNB Supply and Control Voltage Regulator
RT5047B RICHTEK-RT5047B Datasheet
925Kb / 17P
   Single Output LNB Supply and Control Voltage Regulator
logo
Intersil Corporation
ISL9492_1103 INTERSIL-ISL9492_1103 Datasheet
1Mb / 21P
   Single Output LNB Supply and Control Voltage Regulator
logo
Allegro MicroSystems
A8298SESTR-T ALLEGRO-A8298SESTR-T Datasheet
101Kb / 2P
   Single LNB Supply and Control Voltage Regulator
A8291 ALLEGRO-A8291 Datasheet
396Kb / 18P
   Single LNB Supply and Control Voltage Regulator
February 15, 2012
A8291 ALLEGRO-A8291 Datasheet
369Kb / 19P
   Single LNB Supply and Control Voltage Regulator
A8294 ALLEGRO-A8294 Datasheet
344Kb / 18P
   Single LNB Supply and Control Voltage Regulator
More results


Html Pages

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


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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