AOSMD AOZ1015-EVA Ezbuckâ ¢ 1.5a simple buck regulator evaluation board note Datasheet

AOZ1015-EVA
EZBuck™ 1.5A Simple Buck Regulator
Evaluation Board Note
General Description
Features
The AOZ1015 evaluation board is a fully assembled and
tested circuit board built with the AOZ1015 buck regulator
IC. It outputs a preset or adjustable voltage at 3.3V and
up to 1.5A of continuous current. The evaluation board
requires an input voltage from 4.5V to 16V. The output
voltage is preset and can be adjusted from 0.8V to
VIN–0.4V.
The AOZ1015-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 integrated
internal MOSFET minimize component count, board area
and total cost.
The AOZ1015-EVA demonstrates the simple buck converter design. Only one resistor value change is required
for different output voltages while inductor, capacitor and
compensation resistor values are unchanged. The
AOZ1015-EVA also supports the simple-layer board
design with all ceramics output capacitor.
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4.5V to 16V operating input voltage range
Output voltage is preset to 3.3V and adjustable down
to 0.8V
1.5A continuous output current
Fixed 500kHz PWM operation
Internal soft start
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Enables single layer board with all ceramic output
capacitors design
Applications
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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
VIN
C5
C1
22µF Ceramic
VIN
EN
L1
4.7µH
AOZ1015
C6
C4
COMP
RC
CC
VOUT
LX
R1
FB
AGND
PGND
C2, C3
22µF Ceramic
R2
10kΩ
Figure 1.
Rev. 1.0 October 2007
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AOZ1015-EVA
Component List
Ref
Designation
Value
Description
Manufacturer
Part Number
C1
22µF
Ceramic Cap, 22µF, 25V, 1210, X5R
GRM32ER61E226KE15L
C2
22µF
Ceramic Cap, 22µF, 25V, 1210, X5R
GRM32ER61E226KE15L
C3
22µF
Ceramic Cap, 22µF, 25V, 1210, X5R
GRM32ER61E226KE15L
C4
NU
C5
1µF
Ceramic Cap, 1µF, 25V, 0603, X5R
GRM188R61E105KA12D
C6
1000pF
Ceramic Cap, 1000pF, 50V, 0603, X7R
GRM188R71E102K
CC
1000pF
Ceramic Cap, 1000pF, 50V, 0603, X7R
GRM188R71E102K
RC
20kΩ
Thick Film Res, 1%, 31.6k, 0603
CRCW060320K6FKTAP
R1(1)
31.6kΩ
Thick Film Res, 1%, 31.6k, 0603
CRCW060331K6FKTAP
Manufacturer
Murata
DALE
R2
10kΩ
Thick Film Res, 1%, 10k, 0603
CRCW060310K0FKTAP
L1
4.7µH
Inductor, 4.7µH, 2.9A
LQH55DN4R7M03
Murata
U1
AOZ1015AI
Buck Regulator IC, 1.5A, 16V
AOZ1015AI
AOS
Note:
8 + ( 10 × V O )
- . Table 1 shows that the value of R1 with typical output voltages.
1. Output voltage is set by R1; R1 = ---------------------------------0.8kΩ
Table 1.
Vo (V)
R1 (kΩ)
1.2
4.99
1.8
12.7
2.5
21.5
3.3
31.6
5.0
52.3
Rev. 1.0 October 2007
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AOZ1015-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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AOZ1015-EVA
Quick Start Guide
1. Connect the terminals of load to +VOUT pins and GND pins. Set load current to between 0A and 1.5A.
2. Connect the DC power supply to +VIN pin and GND pins. Set DC power supply voltage to between 4.5V and 16V.
3. Connect EN pin to +VIN or any voltage source which is higher than 2V and less than 16V.
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 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.
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.
Rev. 1.0 October 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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