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PDF AOZ1041 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1041 | |
| Descripción | 1.5A Simple Buck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
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General Description
The AOZ1041 is a high efficiency, simple to use,
1.5A buck regulator. The AOZ1041 works from a
4.5V to 16V input voltage range, and provides up to
1.5A of continuous output current with an output
voltage adjustable down to 0.8V.
The AOZ1041 comes in an SO-8 package and is
rated over a -40°C to +85°C ambient temperature
range.
AOZ1041
EZBuck™ 1.5A Simple Buck Regulator
ADVANCED DATASHEET
(Specifications subject to change)
Features
4.5V to 16V operating input voltage range
130 mΩ internal PFET switch for high
efficiency: up to 95%
Internal Schottky Diode
Internal soft start
Output voltage adjustable to 0.8V
1.5A continuous output current
Fixed 500kHz PWM operation
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Small size SO-8 package
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
Figure 1. 3.3V/1.5A Buck Down Regulator
AOZ1041 Datasheet Rev 0.4
CONFIDENTIAL
Not to be distributed or copied without the written permission of Alpha & Omega Semiconductor
1
1 page  
Alpha & Omega Semiconductor
AOZ1041
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
1us/div
Start up to full load
1us/div
Full load to turn off
1ms/div
Load transient
1ms/div
Light load to turn off
100us/div
1s/div
AOZ1041 Datasheet Rev 0.4
CONFIDENTIAL
Not to be distributed or copied without the written permission of Alpha & Omega Semiconductor
5
5 Page 
Alpha & Omega Semiconductor
AOZ1041
also called the converter bandwidth. Generally a
higher bandwidth means faster response to load
transient. However, the bandwidth should not be
too high because of system stability concern. When
designing the compensation loop, converter stability
under all line and load condition must be
considered.
Usually, it is recommended to set the bandwidth to
be equal or less than 1/10 of switching frequency.
The AOZ1041 operates at a fixed 500kHz switching
frequency. It is recommended to choose a
crossover frequency equal or less than 50kHz.
Thermal management and layout consideration
In the AOZ1041 buck regulator circuit, high pulsing
current flows through two circuit loops. The first
loop starts from the input capacitors, to the VIN pin,
to the LX pins, to the filter inductor, to the output
capacitor and load, and then return to the input
capacitor through ground. Current flows in the first
loop when the high side switch is on. The second
loop starts from inductor, to the output capacitors
and load, to the PGND pin of the AOZ1041, to the
LX pins of the AOZ1041. Current flows in the
second loop when the low side diode is on.
fC = 50kHz
The strategy for choosing RC and CC is to set the
cross over frequency with RC and set the
compensator zero with CC. Using selected
crossover frequency, fC, to calculate RC:
RC
=
fC
× VO
VFB
× 2π × CO
GEA × GCS
where
fC is desired crossover frequency. For best
performance, fc is set to be about 1/10 of
switching frequency;
VFB is 0.8V;
GEA is
which
the error amplifier
is 200·10-6 A/V;
transconductance,
GCS is the current sense circuit
transconductance, which is 6.68 A/V;
The compensation capacitor CC and resistor RC
together make a zero. This zero is put somewhere
close to the dominate pole fp1 but lower than 1/5 of
selected crossover frequency. CC can is selected by:
CC
=
2π
1.5
× RC ×
f P1
Equation above can also be simplified to:
CC
=
CO × RL
RC
An easy-to-use application software which helps to
design and simulate the compensation loop can be
found at www.aosmd.com.
In PCB layout, minimizing the two loops area
reduces the noise of this circuit and improves
efficiency. A ground plane is strongly recommended
to connect input capacitor, output capacitor, and
PGND pin of the AOZ1041.
In the AOZ1041 buck regulator circuit, the two
major power dissipating components are the
AOZ141 and output inductor. The total power
dissipation of converter circuit can be measured by
input power minus output power.
Ptotal = VIN ⋅ I IN − VO ⋅ IO
The power dissipation of inductor can be
approximately calculated by output current and
DCR of inductor.
Pindcutor = IO 2 ⋅ Rinductor ⋅ 1.1
The actual junction temperature can be calculated
with power dissipation in the AOZ1041 and thermal
impedance from junction to ambient.
T junction = ( Ptotal − Pinductor ) ⋅ ΘJA
The maximum junction temperature of AOZ1041 is
150ºC, which limits the maximum load current
capability. Please see the thermal de-rating curves
for the maximum load current of the AOZ1041
under different ambient temperature.
The thermal performance of the AOZ1041 is
strongly affected by the PCB layout. Extra care
should be taken by users during design to ensure
that the IC will operate under the recommended
environmental conditions.
Several layout tips are listed below for the best
electric and thermal performance:
1. Do not use thermal relief connection to the VIN
and the PGND pin. Pour a maximized copper
AOZ1041 Datasheet Rev 0.4
CONFIDENTIAL
Not to be distributed or copied without the written permission of Alpha & Omega Semiconductor
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AOZ1041.PDF ] | |
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