AOSMD AOZ1210-EVA Ezbuckâ ¢ 2a simple buck regulator evaluation board note Datasheet

AOZ1210-EVA
EZBuck™ 2A Simple Buck Regulator
Evaluation Board Note
General Description
Features
The AOZ1210 evaluation board is a fully assembled and
tested circuit board built with the AOZ1210 buck regulator
IC. It outputs a preset or adjustable voltage at up to 2A of
continuous current. The evaluation board requires an
input voltage from 4.5V to 27V. The output voltage is
preset and can be adjusted.
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The AOZ1210-EVA circuit has features like current limit,
short circuit protection, input under voltage lock out,
internal soft start and thermal shut down. The current
mode control and integrated internal MOSFET minimize
component count, board area and total cost.
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4.5V to 27V operating input voltage range
Output voltage is preset to 3.3V, adjustable down to
0.8V
2A continuous output current
Internal soft start
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Applications
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The AOZ1210 comes in an SO-8 package and is rated
over a -40°C to +85°C ambient temperature range.
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Point of load DC/DC conversion
PCIe graphics cards
Set top boxes
DVD drives and HDD
LCD panels
Cable modems
Telecom/networking/datacom equipment
Evaluation Board Schematic
C7
C8
C1
R3
VIN
BS
L1
VOUT
EN
LX
AOZ1210
C6
R1
FB
VBIAS
C4
GND
COMP
C2
C3
R2
CC
RC
Rev. 1.0 December 2007
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AOZ1210-EVA
BOM of 5V/2A AOZ1210 Regulator
Ref Designation
Value
C1
10µF
C2
22µF
C3
C4
Description
Package
Manufacturer
Ceramic Cap, 50V, X7R/X7R
1210
Murata, AVX
Ceramic Cap, 25V, X7R/X5R
1210
22µF
Ceramic Cap, 25V, X7R/X5R
1210
1µF
Ceramic Cap, 25V, X7R/X5R
0603
Ceramic Cap, 50V, X7R
0603
C5
NC
C6
1µF
C7
0.1µF
Ceramic Cap, 50V, X7R
0603
C8
10µF
Ceramic Cap, 50V, X7R/X7R
1210
CC *
2000pF
Ceramic Cap, 50V, X7R
0603
RC*
5kΩ
Thick Film Res, 1%
0603
R1*
31.6kΩ
Thick Film Res, 1%
0603
R2
10kΩ
Thick Film Res, 1%
0603
R3
0kΩ
Thick Film Res, 1%
0603
L1*
6.8µH
D1
U1
AOZ1210A
MSS1260
DALE
Murata
40V diode, B340B-13
SMB
Diodes
Buck regulator IC
SO-8
AOS
VO is set by R1, (R2 = 10kΩ), R1 = (10 x VO–8) / 0.8kΩ
*Value may change for different output values.
Rev. 1.0 December 2007
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AOZ1210-EVA
PCB Layout
Figure 1. Top Silk Screen
Figure 2. Top Layer
Rev. 1.0 December 2007
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AOZ1210-EVA
Figure 3. Bottom Layer
Quick Start Guide
1. Connect the terminals of load to +VOUT pins and GND pins. Set load current to between 0A and 2A.
2. Connect the DC power supply to +VIN pin and GND pins. Set DC power supply voltage to between 4.5V and 27V.
3. Connect EN pin to +VIN or any voltage source which is between 2.5V and 27V.
4. Turn on DC power supply and evaluation circuit will start.
5. Measure input voltage at the +VIN pin and GND pins to eliminate the effect of voltage drop on wire between DC
power supply and evaluation board.
6. Measure output voltage at the +VOUT pin and GND pins to eliminate the effect of the voltage drop on wire between
load and evaluation board.
7. Use an oscilloscope to monitor input ripple voltage right across input capacitor C1.
8. Use an oscilloscope to monitor output ripple voltage right across output capacitor C2.
Rev. 1.0 December 2007
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AOZ1210-EVA
This data sheet contains preliminary data; supplementary data may be published at a later date.
Alpha & Omega Semiconductor reserves the right to make changes at any time without notice.
LIFE SUPPORT POLICY
ALPHA & OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of
the user.
Rev. 1.0 December 2007
2. A critical component in any component of a life
support, device, or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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