AOZ1017-EVA [AOS]
EZBuck™ 3A Simple Buck Regulator Evaluation Board Note; EZBuck ™ 3A简单降压稳压器评估板注意事项
| 型号： | AOZ1017-EVA |
| 厂家： | 
ALPHA & OMEGA SEMICONDUCTORS |
| 描述： | EZBuck™ 3A Simple Buck Regulator Evaluation Board Note |
| 文件： | 总4页 (文件大小：211K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AOZ1017-EVA
EZBuck™ 3A Simple Buck Regulator
Evaluation Board Note
General Description
Features
The AOZ1017 evaluation board is a fully assembled and
tested circuit board built with the AOZ1017 buck regulator
IC. It outputs a preset or adjustable voltage and up to 3A
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 was preset to 3.3V, adjustable down to
0.8V
● 3A continuous output current
● Fixed 500kHz PWM operation
● Internal soft start
preset and can be adjusted from 0.8V to V –0.4V
IN
The AOZ1017-EVA circuit features include; 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 AOZ1017 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
C1
22µF
C6
NC
VIN
From µPC
L1
U1
EN
VOUT
LX
AOZ1017
C4
NU
COMP
R1
C3
22µF
C2
22µF
FB
R
C
C5
1000pF
AGND
GND
C
C
R2
10kΩ
D1
Figure 1.
Rev. 1.0 October 2007
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AOZ1017-EVA
Component List
Ref
Designation
Manufacturer
Part Number
Value
Description
Manufacturer
C1
C2
C3
C4
C5
C6
22µF
22µF
22µF
NU
Ceramic Cap, 22µF, 25V, 1210, X5R
Ceramic Cap, 22µF, 25V, 1210, X5R
Ceramic Cap, 22µF, 25V, 1210, X5R
GRM32ER61E226KE15L
GRM32ER61E226KE15L
GRM32ER61E226KE15L
Murata
1000pF
NU
Ceramic Cap, 1000pF, 50V, 0603, X7R
GRM188R71E102K
C
R
1000pF
20kΩ
31.6kΩ
10kΩ
4.7µH
Ceramic Cap, 1000pF, 50V, 0603, X7R
Thick Film Res, 1%, 20k, 0603
Thick Film Res, 1%, 31.6k, 0603
Thick Film Res, 1%, 10k, 0603
Inductor, 4.7µH, 6.4A
GRM188R71E222K
CRCW060331K6FKTAP
CRCW060320K0FKTAP
CRCW060310K0FKTAP
MSS1278-472MLD
PDS540-13
C
DALE
C
(1)
R1
R2
L1
Coilcraft
Diodes
AOS
D1
U1
Schottky Diode I
= 5A, SMD
F(av)
AOZ1017AI Buck Regulator IC, 3A, 16V
AOZ1017AI
Note:
1. V is preset to 3.3V. Output voltage is set by R1; R1 = (12.5 x V ) – 10kΩ. Table 1 shows that the value of R1 with typical output
O
O
voltages.
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 October 2007
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AOZ1017-EVA
PCB Layout
Figure 1.Top Silk Screen
Figure 2.Top Layer
Figure 3. Bottom Layer
Rev. 1.0 October 2007
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Page 3 of 4
AOZ1017-EVA
Quick Start Guide
1. Connect the terminals of load to +V
pins and GND pins. Set load current to between 0A and 3A.
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 higher than 2V and less than 16V.
IN
4. Turn on DC power supply and 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 datasheet 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 October 2007
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