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PDF ADP3050 Data sheet ( Hoja de datos )
| Número de pieza | ADP3050 | |
| Descripción | 200 kHz/ 1 A High-Voltage Step-Down Switching Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP3050 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
Wide Input Voltage Range: 3.6 V to 30 V
Adjustable and Fixed (3.3 V, 5 V) Output Options
Integrated 1 A Power Switch
Uses Small Surface-Mount Components
Cycle-By-Cycle Current Limiting
Peak Input Voltage (100 ms): 60 V
Thermally Enhanced 8-Lead SOIC Package
Configurable as a Buck, Buck-Boost and SEPIC
Regulator
APPLICATIONS
Industrial Power Systems
PC Peripheral Power Systems
Preregulator for Linear Regulators
Distributed Power Systems
Automotive Systems
Battery Chargers
200 kHz, 1 A High-Voltage
Step-Down Switching Regulator
ADP3050
FUNCTIONAL BLOCK DIAGRAM
BIAS
IN
SD
GND
2.5V
REGULATOR
FREQUENCY
AND CURRENT LIMIT
FOLDBACK
CURRENT SENSE
AMPLIFIER
CURRENT
LIMIT
+ 200kHz
OSCILLATOR
FB
CMP
S Q DRIVER
R
1.2V
gm
ADP3050
COMP
BOOST
SWITCH
GENERAL DESCRIPTION
The ADP3050 is a current-mode monolithic buck (step-down)
PWM switching regulator that contains a high current 1 A power
switch and all control, logic, and protection functions. It uses a
unique compensation scheme that allows the use of any type of
output capacitor (tantalum, ceramic, electrolytic, OS-CON).
Unlike some buck regulators, the design is not restricted to using
a specific type of output capacitor or ESR value.
A special boosted drive stage is used to saturate the NPN power
switch, providing a system efficiency higher than conventional
bipolar buck switchers. Further efficiency improvements are ob-
tained by using the low voltage regulated output to provide the
device's internal operating current. A high switching frequency
allows the use of small external surface-mount components. A
wide variety of standard off-the-shelf devices can be used, pro-
viding a great deal of design flexibility. A complete regulator
design requires only a few external components.
The ADP3050 includes a shutdown input that places the device
in a low-power mode, reducing the total supply current to under
20 µA. Internal protection features include thermal shutdown
circuitry and a cycle-by-cycle current-limit for the power switch
to provide complete device protection under fault conditions.
The ADP3050 provides excellent line and load regulation,
maintaining typically less than ± 3% output voltage accuracy
over temperature and under all input voltage and output current
conditions.
The ADP3050 is specified over the industrial temperature range of
–40°C to +85°C and is available in a thermally enhanced 8-lead
SOIC package.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
1 page  
100
90
80
70
60
50
40
30
20
10
0
0
VIN = 5V
VIN = 12V VIN = 24V
VIN = 18V VIN = 30V
L = 33H
CIN = 22F
COUT = 100F
200 400 600 800
OUTPUT CURRENT – mA
Figure 7. 3.3 V Output Efficiency
1k
0.5
0.4
VIN = 10V
ILOAD = 1A
0.3
0.2
0.1
0
؊0.1
؊0.2
؊0.3
؊0.4
؊0.5
؊45 ؊35 ؊25 ؊15 ؊5 5 15 25 35 45 55 65 75 85
TEMPERATURE – ؇C
Figure 8. Output Voltage Change vs. Temperature
0.6
VOUT = 3.3V
0.4
ADP3050
0.2
0
؊0.2
ILOAD = 100mA
ILOAD = 1A
؊0.4
؊0.6
0
10 20
INPUT VOLTAGE – V
30
Figure 10. 3.3 V Output Voltage Change vs. Input Voltage
8
7
6 VOUT = 5V
5
4
VOUT = 3.3V
3
2
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT – A
Figure 11. Minimum Input Voltage vs. Load Current
0.6
VOUT = 5V
0.4
0.2
0.0
؊0.2
ILOAD = 1A
ILOAD = 100mA
؊0.4
؊0.6
0
10 20
INPUT VOLTAGE – V
30
Figure 9. 5 V Output Voltage Change vs. Input Voltage
0
؊0.02
؊0.04
؊0.06
؊0.08
؊0.10
؊0.12
؊0.14
؊0.16
؊0.18
0
VIN = 10V
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
LOAD CURRENT – A
Figure 12. Load Regulation
0.9 1.0
REV. 0
–5–
5 Page 
ADP3050
2. Decide what type of capacitor to use (tantalum, ceramic,
etc.), then look at the table for some possible devices. Many
more values, sizes, and voltage ratings are available, so contact
each manufacturer for a complete product list. If a certain type
of capacitor must be used and space permits, simply use
several devices in parallel to reduce the total ESR.
3. Check the capacitor voltage rating and ripple current rating
to ensure it will work for your application (these ratings are
derated for higher temperatures, so always check the
manufacturer’s data sheet).
4. Make sure the final choice for the output capacitor has been
optimized for cost, size, availability, and performance while
still meeting the required capacitance. The recommended
capacitance is in the 47 µF to 220 µF range.
CATCH DIODE SELECTION
The recommended catch diode is a type 1N5818 Schottky or an
equivalent. The low forward voltage drop (450 mV typical at 1 A)
and fast switching speed of a Schottky rectifier provide the best
performance and efficiency. The 1N5818 is rated at 30 V reverse
voltage and 1 A average forward current. For lower input voltages,
use a lower voltage Schottky to reduce the diode forward voltage
drop and increase overall system efficiency (i.e., a 12 V to 5 V
system does not need a 30 V diode). For automotive applications,
a 60 V Schottky may be necessary. The average forward current for
the catch diode can be calculated by:
IDIODE(AVG)
=
IOUT
× VIN –VOUT
VIN
(5)
For the earlier continuous mode example (12 V to 5 V at 800 mA),
the average diode current would be:
IDIODE(AVG)
=
0.8
×
12 –
12
5
= 0.47 A
For this system, a 1N5817 would be a good choice (rated at 20 V
and 1 A). Do not use catch diodes rated less than 1 A. Even though
the average current can be less than 1 A under normal operating
conditions, since the diode current will be much higher under fault
conditions. The worst case fault condition for the diode occurs when
the regulator becomes slightly overloaded (sometimes called a soft
Table III. Capacitor Selection Guide
Vendor/
Series
Value
(F)
ESR*
(⍀)
AVX
TPS
TPS
TPS
TPS
Y5V
Y5V
Y5V
Y5V
100
47
100
100
10
10
18
22
0.150
0.150
0.100
0.125
~0.040
~0.040
~0.040
~0.040
Sprague
593D
593D
593D
593D
47
68
100
100
0.150
0.150
0.100
0.100
Tokin
CU
CU
CU
CU
CU
10
10
18
10
22
~0.040
~0.040
~0.040
~0.040
~0.030
*Maximum ESR ratings at 100 kHz; MLC = multilayer ceramic.
Max
Voltage
(V)
6.3
16
10
16
10
16
10
10
16
16
10
16
10
25
25
50
25
Type
Tantalum
Tantalum
Tantalum
Tantalum
MLC
MLC
MLC
MLC
Tantalum
Tantalum
Tantalum
Tantalum
MLC
MLC
MLC
MLC
MLC
Package
Dimensions (mm)
WL
H
3.2 6.0
4.3 7.3
4.3 7.3
4.3 7.3
1.6 3.2
2.5 3.2
2.5 3.2
2.5 3.2
2.6
2.9
2.9
2.9
1.5
1.7
1.7
1.7
4.3 7.3
4.3 7.3
4.3 7.3
4.3 7.3
2.8
2.8
2.8
4.0
1.6 3.2
2.7 5.7
5.0 5.7
5.0 5.7
5.0 5.7
1.6
2.5
2.5
3.0
3.0
Company
AVX
Kemet
Murata (USA)
Nemco
Sprague
Tokin (USA)
Tokin (Japan)
Taiyo Yuden (USA)
Taiyo Yuden (Japan)
REV. 0
Table IV. Capacitor Manufacturers
Phone
(803) 448-9411
(864) 963-6300
(800) 831-9172
(800) 227-4058
(207) 324-4140
(408) 432-8020
81-22-211-1281
(800) 348-2496
81-33-833-5441
Fax
(803) 448-1943
(864) 963-6521
(770) 436-3030
(650) 571-0825
(207) 324-7223
(408) 434-0375
81-22-211-0975
(847) 925-0899
81-33-835-4754
Web Address
www.avxcorp.com
www.kemet.com
www.murata.com
www.nemcocaps.com
www.vishay.com
www.tokin.com
www.tokin.com
www.t-yuden.com
www.t-yuden.com
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADP3050.PDF ] | |
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