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PDF AOZ1013 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1013 | |
| Descripción | 3A Simple Buck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AOZ1013 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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EZBuck™ 3A Simple Buck Regulator
February 2006
General Description
The AOZ1013 is a high efficiency, simple to use, 3A buck
regulator. The AOZ1013 works from a 4.5V to 16V input
voltage range, and provides up to 3A of continuous output
current with an output voltage adjustable down to 0.8V.
The AOZ1013 comes in SO-8 packages and is rated over a
-40°C to +85°C ambient temperature range.
Features
• 4.5V to 16V operating input voltage range
• 50 mΩ internal PFET switch for high
efficiency: up to 95%
• Internal soft start
• Output voltage adjustable to 0.8V
• 3A continuous output current
• Fixed 500kHz PWM operation
• Cycle-by-cycle current limit
• Short-circuit protection
• Thermal shutdown
• Small size SO-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
C1
10uF
VIN
From uPC
RC
CC
EN
AOZ1013 LX
COMP
FB
AGND
PGND
L1 4.7uH
R1
R2
D1
VOUT
+3.3V Output
@3A
C2
47uF
Figure 1. 3.3V/3A Buck Down Regulator
February 2006
www.aosmd.com
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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
50mV/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
100us/div
Vo
Ripple
0.1V/div
Io
2A/div
1s/div
Vin
5V/div
Vo
1V/div
Iin
1A/div
February 2006
www.aosmd.com
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If the impedance of ESR at switching frequency
dominates, the output ripple voltage is mainly
decided by capacitor ESR and inductor ripple current.
The output ripple voltage calculation can be further
simplified to:
∆VO = ∆I L × ESRCO
For lower output ripple voltage across the entire
operating temperature range, X5R or X7R dielectric
type of ceramic, or other low ESR tantalum are
recommended to be used as output capacitors.
In a buck converter, output capacitor current is
continuous. The RMS current of output capacitor is
decided by the peak to peak inductor ripple current. It
can be calculated by:
I CO _ RMS
=
∆I L
12
Usually, the ripple current rating of the output
capacitor is a smaller issue because of the low
current stress. When the buck inductor is selected to
be very small and inductor ripple current is high,
output capacitor could be overstressed.
Loop Compensation
The AOZ1013 employs peak current mode control for
easy use and fast transient response. Peak current
mode control eliminates the double pole effect of the
output L&C filter. It greatly simplifies the
compensation loop design.
With peak current mode control, the buck power
stage can be simplified to be a one-pole and one-zero
system in frequency domain. The pole is dominant
pole and can be calculated by:
f p1
=
2π
1
× CO
×
RL
The zero is a ESR zero due to output capacitor and its
ESR. It is can be calculated by:
fZ1
=
2π
1
× CO ×
ESRCO
The compensation design is actually to shape the
converter close loop transfer function to get desired
gain and phase. Several different types of
compensation network can be used for the AOZ1013.
For most cases, a series capacitor and resistor
network connected to the COMP pin sets the pole-
zero and is adequate for a stable high-bandwidth
control loop.
In the AOZ1013, FB pin and COMP pin are the
inverting input and the output of internal
transconductance error amplifier. A series R and C
compensation network connected to COMP provides
one pole and one zero. The pole is:
f p2
=
2π
GEA
× CC × GVEA
Where GEA is the error amplifier transconductance,
which is 200•10-6 A/V;
GVEA is the error amplifier voltage gain,
which is 500 V/V;
CC is compensation capacitor;
The zero given by the external compensation network,
capacitor CC and resistor RC, is located at:
fZ2
=
2π
1
× CC
×
RC
To design the compensation circuit, a target
crossover frequency fC for close loop must be
selected. The system crossover frequency is where
control loop has unity gain. The crossover frequency
is 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
less than 1/10 of switching frequency. The AOZ1013
operates at a fixed switching frequency range from
350kHz to 600kHz. It is recommended to choose a
crossover frequency less than 30kHz.
fC = 30kHz
Where
CO is the output filter capacitor;
RL is load resistor value;
ESRCO is the equivalent series resistance of
output capacitor;
February 2006
www.aosmd.com
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AOZ1013.PDF ] | |
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