Moteur de recherche de fiches techniques de composants électroniques
  French  ▼

Delete All
ON OFF
ALLDATASHEET.FR

X  

Preview PDF Download HTML

IRU1120 Fiches technique(PDF) 4 Page - International Rectifier

No de pièce IRU1120
Description  2A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
Download  9 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  IRF [International Rectifier]
Site Internet  http://www.irf.com
Logo IRF - International Rectifier

IRU1120 Fiches technique(HTML) 4 Page - International Rectifier

  IRU1120 Datasheet HTML 1Page - International Rectifier IRU1120 Datasheet HTML 2Page - International Rectifier IRU1120 Datasheet HTML 3Page - International Rectifier IRU1120 Datasheet HTML 4Page - International Rectifier IRU1120 Datasheet HTML 5Page - International Rectifier IRU1120 Datasheet HTML 6Page - International Rectifier IRU1120 Datasheet HTML 7Page - International Rectifier IRU1120 Datasheet HTML 8Page - International Rectifier IRU1120 Datasheet HTML 9Page - International Rectifier  
Zoom Inzoom in Zoom Outzoom out
 4 / 9 page
background image
IRU1120
4
Rev. 1.3
08/20/02
www.irf.com
APPLICATION INFORMATION
Introduction
The IRU1120 adjustable regulator is a five-terminal de-
vice designed specifically to provide extremely low drop-
out voltages comparable to the PNP type without the
disadvantage of the extra power dissipation due to the
base current associated with PNP regulators. This is
done by bringing out the control pin of the regulator that
provides the base current to the power NPN and con-
necting it to a voltage that is grater than the voltage present
at the VIN pin. This flexibility makes the IRU1120 ideal
for applications where dual inputs are available such as
a computer mother board with an ATX style power sup-
ply that provides 5V and 3.3V to the board.
The IRU1120 is specifically designed to meet the fast
current transient needs as well as providing an accurate
initial voltage, reducing the overall system cost with the
need for fewer number of output capacitors.
Output Voltage Setting
The IRU1120 can be programmed to any voltage in the
range of 1.25V to 5.5V by using two external resistors.
The output voltage is defined as:
Where:
VREF = 1.25V Typically
IADJ < 1
mA Typically
R1 and R2 as shown in Figure 3:
Figure 3 - Typical application of the IRU1120
for programming the output voltage.
The IRU1120 keeps a constant 1.25V between the ad-
just pin and the ground pin. By replacing a resistor (R2),
between these two pins, a constant current flows through
R1, subtracting the IADJ current out of the R1 to set the
overall output voltage. Notice that since the IADJ is typi-
cally in the range of 1
mA, it only adds a small error to
the output voltage which is negligible.
Figure 2 - Simplified block diagram of the IRU1120.
BLOCK DIAGRAM
VCTRL
VIN
Gnd
2
1
3
4 VOUT
THERMAL
SHUTDOWN
1.25V
5
VADJ
+
+
CURRENT
LIMIT
VOUT
R1
R2
VIN
VCTRL
IADJ = 1uA
IRU1120
Adj
VOUT
VCTRL
VIN
Gnd
VOUT = VREF
3 1+
+IADJ
3R1
R1
R2
(
)


Html Pages

1  2  3  4  5  6  7  8  9 


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
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