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參數(shù)資料
| 型號： | AOZ1010AI |
| 廠商： | ALPHA |
| 英文描述： | EZBuck TM 2A Simple Buck Regulator |
| 中文描述： | EZBuck商標(biāo)2A條簡單的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 577K |
| 代理商： | AOZ1010AI |
^lwNMNM
operates at a fixed switching frequency range from
350kHz to 600kHz. It is recommended to choose a
crossover frequency less than 30kHz.
f
C
30
=
The strategy for choosing R
and C
is to set the cross
over frequency with R
and set the compensator zero
with C
. Using selected crossover frequency, f
C
, to
calculate R
C
:
V
f
R
×
=
February 2006
www.aosmd.com
Page 12 of 16
kHz
CS
EA
O
FB
O
C
C
G
G
C
V
×
×
×
π
2
where f
is desired crossover frequency;
V
FB
is 0.8V;
G
is the error amplifier transconductance,
which is 20010
G
is the current sense circuit
transconductance, which is 5.64 A/V;
The compensation capacitor C
and resistor R
together
make a zero. This zero is put somewhere close to the
dominate pole f
but lower than 1/5 of selected
crossover frequency. C
C
can is selected by:
-6
A/V;
1
2
5
R
×
π
P
C
C
f
C
×
=
Equation above can also be simplified to:
C
L
O
C
R
R
C
C
×
=
An easy-to-use application software which helps to
design and simulate the compensation loop can be
found at www.aosmd.com.
Thermal management and layout consideration
In the AOZ1010 buck regulator circuit, high pulsing
current flows through two circuit loops. The first loop
starts from the input capacitors, to the VIN pin, to the
LX pins, to the filter inductor, to the output capacitor
and load, and then return to the input capacitor through
ground. Current flows in the first loop when the high
side switch is on. The second loop starts from inductor,
to the output capacitors and load, to the PGND pin of
the AOZ1010, to the LX pins of the AZO1010. Current
flows in the second loop when the low side diode is on.
In PCB layout, minimizing the two loops area reduces
the noise of this circuit and improves efficiency. A
ground plane is strongly recommended to connect input
capacitor, output capacitor, and PGND pin of the
AOZ1010.
In the AOZ1010 buck regulator circuit, the two major
power dissipating components are the AOZ1010 and
output inductor. The total power dissipation of converter
circuit can be measured by input power minus output
power.
V
P
=
_
The power dissipation of inductor can be approximately
calculated by output current and DCR of inductor.
=
O
loss
indcutor
I
P
The actual AOZ1010 junction temperature can be
calculated with power dissipation in the AOZ1010 and
thermal impedance from junction to ambient.
P
T
=
(
_
The maximum junction temperature of AOZ1010 is
150oC, which limits the maximum load current
capability. Please see the thermal de-rating curves for
the maximum load current of the AOZ1010 under
different ambient temperature.
The thermal performance of the AOZ1010 is strongly
affected by the PCB layout. Extra care should be taken
by users during design process to ensure that the IC will
operate
under
the
recommended
conditions.
Several layout tips are listed below for the best electric
and thermal performance. The figure 3 below illustrates
a PCB layout example as reference.
1.
Do not use thermal relief connection to the VIN
and the PGND pin. Pour a maximized copper
area to the PGND pin and the VIN pin to help
thermal dissipation.
2.
Input capacitor should be connected to the VIN
pin and the PGND pin as close as possible.
3.
A ground plane is preferred. If a ground plane is
not used, separate PGND from AGND and
connect them only at one point to avoid the
PGND pin noise coupling to the AGND pin.
4.
Make the current trace from LX pins to L to Co
to the PGND as short as possible.
5.
Pour copper plane on all unused board area
and connect it to stable DC nodes, like VIN,
GND or VOUT.
O
O
IN
IN
loss
total
I
V
I
1
2
_
inductor
R
JA
loss
inductor
P
loss
total
junction
Θ
)
_
environmental
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| AOZ1012D | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 3A Simple Buck Regulator |
| AOZ1012DI | 功能描述:IC REG BUCK ADJ 3A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:EZBuck™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| AOZ1013 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck TM 3A Simple Buck Regulator |
| AOZ1013AI | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck TM 3A Simple Buck Regulator |
| AOZ1013AI_09 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBucka?￠ 3A Simple Regulator |
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