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參數(shù)資料
| 型號(hào)： | AOZ1017 |
| 廠商： | ALPHA |
| 英文描述： | EZBuck⑩ 3A Simple Regulator |
| 中文描述： | EZBuck⑩3A條簡(jiǎn)單的穩(wěn)壓 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 612K |
| 代理商： | AOZ1017 |
AOZ1017
Rev. 1.0 July 2007
www.aosmd.com
Page 11 of 16
concern. When designing the compensation loop,
converter stability under all line and load condition must
be considered.
Usually, it is recommended to set the bandwidth to be
less than 1/10 of the switching frequency. The AOZ1017
operates at a fixed switching frequency range from
400kHz to 600kHz. It is recommended to choose a
crossover frequency less than 50kHz.
The strategy for choosing R
C
and C
C
is to set the cross
over frequency with R
C
and set the compensator zero
with C
C
. Using selected crossover frequency, f
C
, to
calculate R
C
:
where;
f
C
is desired crossover frequency,
V
FB
is 0.8V,
G
EA
is the error amplifier transconductance, which is 200x10
-6
A/V, and
G
CS
is the current sense circuit transconductance, which is
6.68 A/V.
The compensation capacitor C
C
and resistor R
C
together
make a zero. This zero is put somewhere close to the
dominate pole f
p1
but lower than 1/5 of selected cross-
over frequency. C
C
can is selected by:
The equation above can also be simplified to:
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 AOZ1017 buck regulator circuit, high pulsing
current flows through two circuit loops. The first loop
starts from the input capacitors, to the V
IN
pin, to the LX
pins, to the filter inductor, to the output capacitor and
load, and then returns 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 anode of Schottky
diode, to the cathode of Schottky diode. Current flows in
the second loop when the low side diode is on.
In the PCB layout, minimizing the two loops area reduces
the noise of this circuit and improves efficiency. A ground
plane is strongly recommended to connect the input
capacitor, output capacitor, and PGND pin of the
AOZ1017.
In the AOZ1017 buck regulator circuit, the major power
dissipating components are the AOZ1017, the Schottky
diode and output inductor. The total power dissipation of
converter circuit can be measured by input power minus
output power.
The power dissipation in Schottky can be approximated
as:
P
diode_loss
I
O
1
D
–
=
where;
V
FW_Schottky
is the Schottky diode forward voltage drop.
The power dissipation of inductor can be approximately
calculated by output current and DCR of inductor.
The actual junction temperature can be calculated
with power dissipation in the AOZ1017 and thermal
impedance from junction to ambient.
f
C
50
kHz
=
R
C
f
C
V
V
FB
-----------
2
π
C
G
CS
×
G
EA
-----------------------------
×
×
=
C
C
1.5
R
C
2
π
f
p
1
×
×
------------------------------------
=
C
C
C
----------------------
R
L
×
R
C
=
P
total_loss
V
IN
I
IN
V
O
I
O
×
–
×
=
(
)
V
FW_Schottky
×
×
P
inductor_loss
I
O
2
R
inductor
1.1
×
×
=
T
junction
P
total_loss
P
diode_loss
P
inductor_loss
–
–
(
)
Θ
JA
T
amb
+
×
=
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| AOZ1210AI | EZBuck⑩ 2A Simple Buck Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AOZ1017AI | 功能描述:IC REG BUCK ADJ 3A 8SOIC 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:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| AOZ1017DI | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBucka?￠ 3A Simple Regulator |
| AOZ1017-EVA | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck? 3A Simple Buck Regulator Evaluation Board Note |
| AOZ1018 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 2A Simple Regulator |
| AOZ1018AI | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 2A Simple Regulator |
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