AOZ1020-EVA [AOS]
EZBuck⑩ 2A Simple Buck Regulator Evaluation Board Note; EZBuck⑩ 2A简单降压稳压器评估板注意事项
| 型号： | AOZ1020-EVA |
| 厂家： | 
ALPHA & OMEGA SEMICONDUCTORS |
| 描述： | EZBuck⑩ 2A Simple Buck Regulator Evaluation Board Note |
| 文件： | 总4页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AOZ1020-EVA
EZBuck™ 2A Simple Buck Regulator
Evaluation Board Note
General Description
Features
The AOZ1020 evaluation board is a fully assembled and
tested circuit board built with the AOZ1020 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 16V. The output voltage is
● 4.5V to 16V operating input voltage range
● Output voltage is preset to 3.3V and adjustable down
to 0.8V
● 2A continuous output current
● Fixed 500kHz PWM operation
● Internal soft start
preset and can be adjusted from 0.8V to V –0.4V
IN
The AOZ1020-EVA circuit has features like current limit,
short circuit protection, input under voltage lock out,
internal soft start and thermal shut down. It operates at
a fixed 500kHz switching frequency. The current mode
control and integrated internal MOSFET minimize
component count, board area and total cost.
● Cycle-by-cycle current limit
● Short-circuit protection
● Thermal shutdown
Applications
● Point of load DC/DC conversion
● PCIe graphics cards
● Set top boxes
The AOZ1020 comes in SO-8 packages and is rated over
a -40°C to +85°C ambient temperature range.
● DVD drives and HDD
● LCD panels
● Cable modems
● Telecom/networking/datacom equipment
Evaluation Board Schematic
VIN
5V
C1
22µF Ceramic
C5
R3
VIN
PG
L1
4.7µH
EN
AOZ1020
C6
VOUT
LX
FB
COMP
R
C
C4
R1
C
C
C2, C3
22µF Ceramic
AGND
PGND
R2
10kΩ
Figure 1.
Rev. 1.0 December 2007
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Page 1 of 4
AOZ1020-EVA
Component List
Ref
Designation
Manufacturer
Part Number
Value
Description
Manufacturer
C1
C2
C3
C4
C5
C6
22µF
Ceramic Cap, 22uF, 25V, 1210, X5R
Ceramic Cap, 22uF, 25V, 1210, X5R
Ceramic Cap, 22uF, 25V, 1210, X5R
GRM32ER61E226KE15L
GRM32ER61E226KE15L
GRM32ER61E226KE15L
Murata
22µF
22µF
NU
1µF
Ceramic Cap, 1uF, 25V, 0603, X5R
Ceramic Cap, 1000pF, 50V, 0603, X7R
Ceramic Cap, 2200pF, 50V, 0603, X7R
Thick Film Res, 1%, 31.6k, 0603
Thick Film Res, 1%, 31.6k, 0603
Thick Film Res, 1%, 10k, 0603
Thick Film Res, 1%, 10k, 0603
Inductor, 4.7uH, 2.9A
GRM188R61E105KA12D
GRM188R71E102K
GRM188R71E222K
CRCW060385K5FKTAP
CRCW060331K6FKTAP
CRCW060310K0FKTAP
CRCW060310K0FKTAP
LQH55DN4R7M03
1000pF
2200pF
8.5kΩ
31.6kΩ
10kΩ
10kΩ
4.7µH
(2)
Cc
(2)
R
DALE
C
(1)
R1
R2
R3
(2)
L1
U1
Murata
AOS
AOZ1020AI Buck regulator IC, 2A, 16V
AOZ1020AI
Notes:
1. For evaluation board with different output voltage, these values might be different.
8 + (10 × VO)
----------------------------------
2. Output voltage is set by R1; R1 =
. Table 1 shows that the value of R1 with typical output voltages.
0.8kΩ
Table 1.
Vo (V)
R1 (kΩ)
1.2
1.8
2.5
3.3
5.0
4.99
12.7
21.5
31.6
52.3
Rev. 1.0 December 2007
www.aosmd.com
Page 2 of 4
AOZ1020-EVA
PCB Layout
Figure 1.Top Silk Screen
Figure 2.Top Layer
Figure 3. Bottom Layer
Rev. 1.0 December 2007
www.aosmd.com
Page 3 of 4
AOZ1020-EVA
Quick Start Guide
1. Connect the terminals of load to +V
pins and GND pins. Set load current to between 0A and 2A.
OUT
2. Connect the DC power supply to +V pin and GND pins. Set DC power supply voltage to between 4.5V and 16V.
IN
3. Connect EN pin to +V or any voltage source which is between 2V and 16V.
IN
4. Turn on DC power supply and the evaluation circuit will start.
5. Measure input voltage at the +V pin and GND pins to eliminate the effect of voltage drop on wire between DC
IN
power supply and evaluation board.
6. Measure output voltage at the +V
and evaluation board.
pin and GND pins to eliminate the effect of voltage drop on wire between load
OUT
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.
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.
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.
Rev. 1.0 December 2007
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