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PDF AOZ1014 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1014 | |
| Descripción | 5A Simple Buck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
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EZBuck™ 5A Simple Buck Regulator
February 2006
General Description
The AOZ1014 is a high efficiency, simple to use, 5A buck
regulator. The AOZ1014 works from a 4.5V to 16V input
voltage range, and provides up to 5A of continuous output
current with an output voltage adjustable down to 0.8V.
The AOZ1014 comes in SO-8 and DFN-8 packages and is
rated over a -40°C to +85°C ambient temperature range.
Features
• 4.5V to 16V operating input voltage
range
• 32 mΩ internal PFET switch for high
efficiency: up to 95%
• Internal soft start
• Output voltage adjustable to 0.8V
• 5A continuous output current
• Fixed 500kHz PWM operation
• Cycle-by-cycle current limit
• Short-circuit protection
• Thermal shutdown
• Small size SO-8 and DFN-8 packages
Applications
• Point of load dc/dc conversion
• PCIe graphics cards
• Set top boxes
• DVD drives and HDD
• LCD panels
• Cable modems
• Telecom/Networking/Datacom
equipment
Typical Application
VIN
22uF
C1
From uPC
RC
CC
VIN
EN
AOZ1014 LX
COMP
AGND
FB
PGND
L1 4.7uH
R1
D1 R2
VOUT +3.3V Output
@5A
C2
100uF
February 2006
Figure 1. 3.3V/5A Buck Down Regulator
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Typical Performance Characteristics
Circuit of figure 1. TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified.
Light load (DCM) operation
Full load (CCM) operation
Vin
ripple
0.1V/div
Vo
ripple
50mV/div
Iin
2A/div
VLX
10V/div
1us/div
Start up to full load
1us/div
Full load to turn off
Vin
5V/div
Vo
1V/div
Iin
1A/div
1ms/div
Load transient
1ms/div
Light load to turn off
Vin
ripple
0.1V/div
Vo
ripple
50mV/div
Iin
2A/div
VLX
10V/div
Vin
5V/div
Vo
1V/div
Iin
1A/div
Vo
Ripple
0.2V/div
Vin
5V/div
100us/div
Io
2A/div
1s/div
Vo
1V/div
Iin
1A/div
February 2006
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and high ripple current rating. Depending on the
application circuits, other low ESR tantalum capacitor
may also be used. When selecting ceramic capacitors,
X5R or X7R type dielectric ceramic capacitors are
preferred for their better temperature and voltage
characteristics. Note that the ripple current rating from
capacitor manufactures are based on certain amount of
life time. Further de-rating may be necessary for
practical design requirement.
Inductor
The inductor is used to supply constant current to
output when it is driven by a switching voltage. For
given input and output voltage, inductance and
switching frequency together decide the inductor ripple
current, which is,
∆I L
=
VO × (1 − VO )
f ×L
VIN
The peak inductor current is:
I Lpeak
=
IO
+
∆I L
2
High inductance gives low inductor ripple current but
requires larger size inductor to avoid saturation. Low
ripple current reduces inductor core losses. It also
reduces RMS current through inductor and switches,
which results in less conduction loss. Usually, peak to
peak ripple current on inductor is designed to be 20%
to 30% of output current.
When selecting the inductor, make sure it is able to
handle the peak current without saturation even at the
highest operating temperature.
The inductor takes the highest current in a buck circuit.
The conduction loss on inductor needs to be checked
for thermal and efficiency requirements.
Surface mount inductors in different shape and styles
are available from Coilcraft, Elytone and Murata.
Shielded inductors are small and radiate less EMI noise.
But they cost more than unshielded inductors. The
choice depends on EMI requirement, price and size.
Table below lists some inductors for typical output
voltage design.
Table 2.
Vout L1
5.0 V Shielded, 4.7uH
MSS1278-472MLD
Shielded, 4.7uH
MSS1260-472MLD
3.3 V Un-shielded, 3.3uH
DO3316P-332MLD
Shielded, 3.3uH
DO1260-332NXD
Shield, 3.3uH
ET553-3R3
1.8 V Shield, 2.2uH
ET553-2R2
Un-shielded, 2.2uH
DO3316P-222MLD
Shielded, 2.2uH
MSS1260-222NXD
Manufacture
Coilcraft
Coilcraft
Coilcraft
Coilcraft
ELYTONE
ELYTONE
Coilcraft
Coilcraft
Output Capacitor
The output capacitor is selected based on the DC
output voltage rating, output ripple voltage specification
and ripple current rating.
The selected output capacitor must have a higher rated
voltage specification than the maximum desired output
voltage including ripple. De-rating needs to be
considered for long term reliability.
Output ripple voltage specification is another important
factor for selecting the output capacitor. In a buck
converter circuit, output ripple voltage is determined by
inductor value, switching frequency, output capacitor
value and ESR. It can be calculated by the equation
below:
∆VO
=
∆I L
× (ESRCO
+
8×
1
f × CO
)
where CO is output capacitor value and ESRCO is the
Equivalent Series Resistor of output capacitor.
When low ESR ceramic capacitor is used as output
capacitor, the impedance of the capacitor at the
switching frequency dominates. Output ripple is mainly
caused by capacitor value and inductor ripple current.
The output ripple voltage calculation can be simplified
to:
∆VO
=
∆I L
×
8×
1
f × CO
February 2006
www.aosmd.com
Page 11 of 21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AOZ1014.PDF ] | |
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