AOZ1020AI-EVB [AOS]
EZBuck⢠2A Synchronous Buck Regulator Evaluation Board Note; EZBuckâ ?? ¢ 2A同步降压稳压器评估板注意事项
| 型号： | AOZ1020AI-EVB |
| 厂家： | 
ALPHA & OMEGA SEMICONDUCTORS |
| 描述： | EZBuck⢠2A Synchronous Buck Regulator Evaluation Board Note |
| 文件： | 总4页 (文件大小：206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AOZ1020AI-EVB
EZBuck™ 2A Synchronous Buck Regulator
Evaluation Board Note
General Description
Features
The AOZ1020AI evaluation board is a fully assembled
and tested circuit board built with the AOZ1020AI buck
regulator IC. It outputs an adjustable voltage up to 2A of
continuous current. The evaluation board requires an
input voltage from 4.5 to 16V.The output voltage is preset
at 3.3V and can be adjusted down to 0.8V.
● 4.5V to 16V operating input voltage range
● Output voltage preset to 3.3V, adjustable to as low as
0.8V
● 2A continuous output current
● Fixed 500kHz PWM operation
● Internal soft start
The AOZ1020AI-EVB 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 integrated
internal MOSFETs minimize component count, board
area and total cost.
● Open-drain Power Good output
● Cycle-by-cycle current limit
● Short-circuit protection
● Thermal shutdown
● Enables single layer board design
The AOZ1020AI-EVB demonstrates the simple buck
converter design. Only one resistor value change is
needed for different output voltage designs. The
AOZ1020AI-EVB also supports single layer board
design.
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
Evaluation Board Schematic
Rg
PG5V
10k
PG
Cp
open
Cc
Rc
GND
GND
GND GND
20k
C5
open
102
U1
3
5
8
R2
10k
C6
AGND
R4
R1
4
7
6
EN
FB
LX
EN
EN
Vin
31.6k
R3
0
C4
104
L
2
1
2
VIN
1
VO
4R7
Vin
C1
226
C3
226
C2
226
GND
GND
GND
Rev. 1.1 July 2009
www.aosmd.com
Page 1 of 4
AOZ1020AI-EVB
Table 1. Component List
Ref Designation
Part Number
Description
Manufacturer
C1, C2, C3
C4
GRM32ER61E226KE15L
Cap, 22µF/25V, 1210, X5R, 10%
Cap, 0.1µF/50V, 0603, X7R, 10%
Cap, 0603
muRata
muRata
TDK, muRata
TDK
GRM188R71H104KA01D
C5, Cp
C6, Cc
Open
C1608C0G1H102J
Cap, 1nF/50V, 0603, X7R 10%
GRM188R71H102KA01D
muRata
TDK
L
VLF10040T-4R7N5R4
Inductor, 4.7µH, 5.4A
Res, 31.6k, 0603, 1%
Res, 20k, 0603, 1%
Res, 0, 0603
R1
31.6k
20k
R2
R3
0
R4
Open
10k
Res, 0603, 5%
R5, Rc
U1
Res, 10k, 0603, 5%
IC, MAX 2A, SO8
AOZ1020AI
AOS
Output voltage is set by R1: R1= R2 • (Vout – 0.8) / 0.8. Table 2 below shows the value of R1 at typical output
voltages.
Table 2.
Vout (V)
R1 (kΩ)
R2 (kΩ)
0.8
1
1
Open
10
2.49
4.99
8.66
12.7
21.5
31.6
52.3
1.2
1.5
1.8
2.5
3.3
5
10
10
10
10
10
10
Rev. 1.1 July 2009
www.aosmd.com
Page 2 of 4
AOZ1020AI-EVB
PCB Layout
Figure 1.Top Silk Screen
Figure 2.Top Layer
Figure 3. Bottom Layer
Rev. 1.1 July 2009
www.aosmd.com
Page 3 of 4
AOZ1020AI-EVB
Quick Start Guide
1. Connect the terminals of load to Vout and GND port.
2. Connect the DC power supply to Vin and GND port. Set DC power supply voltage to between 4.5V and 16V.
3. EN pin is connected to Vin via a 0Ohm resistor in the demo board. If a separate enable signal is desired, connect
EN pin to any voltage source between 2.0V and 16V.
4. Measure input voltage at the Vin and GND ports to eliminate the effect of voltage drop on the wire between DC
power supply and evaluation board.
5. Measure output voltage at the Vout and GND ports to eliminate the effect of voltage drop on the wire between load
and evaluation board.
6. Use an oscilloscope to monitor the input ripple voltage across input capacitor C1.
7. Use an oscilloscope to monitor the output ripple voltage across output capacitor C2.
Note:
When testing the ripple voltage, remove the cap of the voltage probe and touch the probe tip directly across the Vin or
Vout and GND terminals, as shown in Figure 4.
V
GND
Figure 4. Voltage Ripple Test
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. 1.1 July 2009
www.aosmd.com
Page 4 of 4
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