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參數(shù)資料
| 型號： | AOZ1014 |
| 廠商： | ALPHA |
| 英文描述： | EZBuck TM 5A Simple Buck Regulator |
| 中文描述： | EZBuck商標(biāo)5A條簡單的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 1147K |
| 代理商： | AOZ1014 |
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If the impedance of ESR at switching frequency
dominates, the output ripple voltage is mainly decided
by capacitor ESR and inductor ripple current. The
output ripple voltage calculation can be further
simplified to:
I
V
=
For lower output ripple voltage across the entire
operating temperature range, X5R or X7R dielectric type
of
ceramic,
or
other
recommended to be used as output capacitors.
In a buck converter, output capacitor current is
continuous. The RMS current of output capacitor is
decided by the peak to peak inductor ripple current. It
can be calculated by:
February 2006
www.aosmd.com
Page 12 of 21
CO
L
O
ESR
×
low
ESR
tantalum
are
12
_
L
RMS
CO
I
I
=
Usually, the ripple current rating of the output capacitor
is a smaller issue because of the low current stress.
When the buck inductor is selected to be very small and
inductor ripple current is high, output capacitor could be
overstressed.
Loop Compensation
The AOZ1014 employs peak current mode control for
easy use and fast transient response. Peak current
mode control eliminates the double pole effect of the
output L&C filter. It greatly simplifies the compensation
loop design.
With peak current mode control, the buck power stage
can be simplified to be a one-pole and one-zero system
in frequency domain. The pole is dominant pole and can
be calculated by:
L
O
p
R
C
f
×
×
=
π
2
1
1
The zero is a ESR zero due to output capacitor and its
ESR. It is can be calculated by:
CO
O
Z
ESR
C
f
×
×
=
π
2
1
1
Where C
O
is the output filter capacitor;
R
is load resistor value;
ESR
is the equivalent series resistance of
output capacitor;
The compensation design is actually to shape the
converter close loop transfer function to get desired
gain and phase. Several different types of compensation
network can be used for the AOZ1014. For most cases,
a series capacitor and resistor network connected to
the COMP pin sets the pole-zero and is adequate for a
stable high-bandwidth control loop.
In the AOZ1014, FB pin and COMP pin are the inverting
input and the output of internal transconductance error
amplifier. A series R and C compensation network
connected to COMP provides one pole and one zero.
The pole is:
VEA
C
EA
p
G
C
G
f
×
×
=
π
2
2
Where G
is the error amplifier transconductance,
which is 20010
G
is the error amplifier voltage gain,
which is 500 V/V;
C
C
is compensation capacitor;
The zero given by the external compensation network,
capacitor C
C
and resistor R
C
, is located at:
-6
A/V;
C
C
Z
R
C
f
×
×
=
π
2
1
2
To design the compensation circuit, a target crossover
frequency f
for close loop must be selected. The
system crossover frequency is where control loop has
unity gain. The crossover frequency is also called the
converter bandwidth. Generally a higher bandwidth
means faster response to load transient. However, the
bandwidth should not be too high because of system
stability 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 switching frequency. AOZ1014
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
=
kHz
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AOZ1014AI | EZBuck TM 5A Simple Buck Regulator |
| AOZ1014DI | EZBuck TM 5A Simple Buck Regulator |
| AOZ1015-EVA | EZBuck⑩ 1.5A Simple Buck Regulator Evaluation Board Note |
| AOZ1015 | EZBuck⑩ 1.5A Synchronous Buck Regulator |
| AOZ1015AI | EZBuck⑩ 1.5A Synchronous Buck Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AOZ1014AI | 功能描述:IC REG BUCK ADJ 5A 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: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 |
| AOZ1014AI_09 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBucka?￠ 5A Simple Buck Regulator |
| AOZ1014DI | 功能描述:IC REG BUCK ADJ 5A 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 |
| AOZ1014DI_09 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBucka?￠ 5A Simple Buck Regulator |
| AOZ1015 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 1.5A Synchronous Buck Regulator |
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