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IRU1160 Fiches technique(PDF) 5 Page - International Rectifier

No de pièce IRU1160
Description  6A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
Download  8 Pages
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Fabricant  IRF [International Rectifier]
Site Internet  http://www.irf.com
Logo IRF - International Rectifier

IRU1160 Fiches technique(HTML) 5 Page - International Rectifier

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IRU1160
5
Rev. 1.4
08/20/02
www.irf.com
VOUT = 2.8V
VIN = 3.3V
VCTRL = 5V
IOUT = 3A (DC Avg)
Assuming, the following conditions:
Calculate the maximum power dissipation using the fol-
lowing equation:
Using table below select the proper package and the
amount of copper board needed.
Pkg
Copper
θJA(°C/W)
Max Pd
Max Pd
Area
(TA=25
°C)
(TA=45
°C)
TO-263 1.4"X1.4"
25
4.4W
3.6W
TO-263 1.0"X1.0"
30
3.7W
3.0W
TO-263 0.7"X0.7"
35
3.1W
2.6W
TO-263 Pad Size
45
2.4W
2.0W
Note: Above table is based on the maximum junction
temperature of 135
8C.
PD = 1
3(3.3 - 2.8)+
3(5 - 2.8) = 1.61W
PD = IOUT
3(VIN - VOUT)+
3(VCTRL - VOUT)
3
60
( )
IOUT
60
( )
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Stability
The IRU1160 requires the use of an output capacitor as
part of the frequency compensation in order to make the
regulator stable. Typical designs for the microproces-
sor applications use standard electrolytic capacitors with
typical ESR in the range of 50 to 100m
V and an output
capacitance of 500 to 1000
mF. Fortunately as the ca-
pacitance increases, the ESR decreases resulting in a
fixed RC time constant. The IRU1160 takes advantage
of this phenomena in making the overall regulator loop
stable.
For most applications a minimum of 100
mF aluminum
electrolytic capacitor such as Sanyo, MVGX series,
Panasonic FA series as well as the Nichicon PL series
insures both stability and good transient response.
Thermal Design
The IRU1160 incorporates an internal thermal shutdown
that protects the device when the junction temperature
exceeds the allowable maximum junction temperature.
Although this device can operate with junction tempera-
tures in the range of 150
8C, it is recommended that the
selected heat sink be chosen such that during maxi-
mum continuous load operation the junction tempera-
ture is kept below
this number. The example below
shows the steps in selecting the proper surface mount
package.


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