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PDF AOZ1212 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1212 | |
| Descripción | EZBuck 3A Simple Buck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AOZ1212 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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AOZ1212
EZBuck™ 3A Simple Buck Regulator
General Description
The AOZ1212 is a high ef ciency , simple to use, 3A buck
regulator e xible enough to be optimized for a variety of
applications. The AOZ1212 works from a 4.5V to 27V
input voltage range, and provides up to 3A of continuous
output current on each buck regulator output. The output
voltage is adjustable down to 0.8V.
The AOZ1212 comes in an SO-8 or DFN-8 package and
is rated over a -40°C to +85°C ambient temperature
range.
Features
● 4.5V to 27V operating input voltage range
● 70mΩ internal NFET, ef ciency: up to 95%
● Internal soft start
● Output voltage adjustable down to 0.8V
● 3A continuous output current
● Fixed 370kHz PWM operation
● Cycle-by-cycle current limit
● Short-circuit protection
● Thermal shutdown
● Small size SO-8 or DFN-8 package
Applications
● Point of load DC/DC conversion
● Set top boxes
● DVD drives and HDD
● LCD monitors & TVs
● Cable modems
● Telecom/networking/datacom equipment
Typical Application
VIN
C1
22µF
C7
VIN BS
EN LX
AOZ1212
VBIAS
FB
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C4 COMP GND
RC
CC
L1
6.8µH
VOUT
R1
C2, C3
22µF
R2
Rev. 1.1 October 2007
Figure 1. 3.3V/3A Buck Regulator
www.aosmd.com
Page 1 of 19
1 page  
AOZ1212
Typical Performance Characteristics
Circuit of Figure 1. TA = 25°C, VIN = VEN = 24V, VOUT = 3.3V unless otherwise speci ed.
Light Load (DCM) Operation
Full Load (CCM) Operation
Vin ripple
0.1V/div
Vo ripple
20mV/div
IL
1A/div
VLX
20V/div
1µs/div
1µs/div
Startup to Full Load
Short Circuit Protection
Vin ripple
0.1V/div
Vo ripple
20mV/div
IL
1A/div
VLX
20V/div
Vo
2V/div
Vo
2V/div
lin
0.5A/div
lL
2A/div
2ms/div
50% to 100% Load Transient
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200µs/div
Vo Ripple
200mV/div
lo
1A/div
200µs/div
Short Circuit Recovery
2ms/div
Vo
2V/div
IL
2A/div
Rev. 1.1 October 2007
www.aosmd.com
Page 5 of 19
5 Page 
AOZ1212
dissipation of converter circuit can be measured by input
power minus output power.
P total _loss = V IN × I IN – V O × I O
The power dissipation of inductor can be approximately
calculated by output current and DCR of the inductor.
P inductor _loss = IO2 × R inductor × 1.1
The power dissipation of the diode is:
P diode_loss
=
IO × VF
×
1
–
V-V-----IO-N---
The actual AOZ1212 junction temperature can be
calculated with power dissipation in the AOZ1212 and
thermal impedance from junction to ambient.
T junction = (P total _loss–P inductor _loss) × ΘJA
+ + T ambient
The maximum junction temperature of AOZ1212 is
145°C, which limits the maximum load current capability.
The thermal performance of the AOZ1212 is strongly
affected by the PCB layout. Care should be taken by
users during design process 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. Figure 3a and Figure 3b show
layout examples for the AOZ1212A and AOZ1212D
respectively.
1. Do not use thermal relief connection to the VIN and
the GND pin. Pour a maximized copper area to the
GND pin and the VIN pin to help thermal dissipation.
2. Input capacitor should be connected as close as
possible to the VIN and GND pins.
3. Make the current trace from LX pins to L to CO to
GND as short as possible.
4. Pour copper plane on all unused board area and
connect it to stable DC nodes, like VIN, GND or VOUT.
5. Keep sensitive signal traces such as the trace
connecting FB and COMP pins away from the
LX pins.
www.DataSheet4U.com
Rev. 1.1 October 2007
www.aosmd.com
Page 11 of 19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AOZ1212.PDF ] | |
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