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參數(shù)資料
| 型號： | AOZ1013AI |
| 廠商： | ALPHA |
| 英文描述： | EZBuck TM 3A Simple Buck Regulator |
| 中文描述： | EZBuck商標3A條簡單的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 578K |
| 代理商： | AOZ1013AI |
^lwNMNP
February 2006
www.aosmd.com
Page 9 of 16
Since the switch duty cycle can be as high as 100%,
the maximum output voltage can be set as high as
the input voltage minus the voltage drop on upper
PMOS and inductor.
Protection Features
The AOZ1013 has multiple protection features to
prevent system circuit damage under abnormal
conditions.
Over Current Protection (OCP)
The sensed inductor current signal is also used for
over current protection. Since AOZ1013 employs
peak current mode control, the COMP pin voltage is
proportional to the peak inductor current. The COMP
pin voltage is limited to be between 0.4V
and 2.5V
internally. The peak inductor current is automatically
limited cycle by cycle.
The cycle by cycle current limit threshold is set
between 4A and 5A. When the load current reaches
the current limit threshold, the cycle by cycle current
limit circuit turns off the high side switch immediately
to terminate the current duty cycle. The inductor
current stop rising. The cycle by cycle current limit
protection directly limits inductor peak current. The
average inductor current is also limited due to the
limitation on peak inductor current. When cycle by
cycle current limit circuit is triggered, the output
voltage drops as the duty cycle decreasing.
The AOZ1013 has internal short circuit protection to
protect itself from catastrophic failure under output
short circuit conditions. The FB pin voltage is
proportional to the output voltage. Whenever FB pin
voltage is below 0.2V, the short circuit protection
circuit is triggered. As a result, the converter is shut
down and hiccups at a frequency equals to 1/8 of
normal switching frequency. The converter will start
up via a soft start once the short circuit condition
disappears. In short circuit protection mode, the
inductor average current is greatly reduced because
of the low hiccup frequency.
Power-On Reset (POR)
A power-on reset circuit monitors the input voltage.
When the input voltage exceeds 4V, the converter
starts operation. When input voltage falls below 3.7V,
the converter will be shut down.
Thermal Protection
An internal temperature sensor monitors the junction
temperature. It shuts down the internal control circuit
and high side PMOS if the junction temperature
exceeds
145oC.
The
automatically under thecontrol of soft-start circuit
regulator
will
restart
When the junction temperature decreases to 100oC.
Application Information
The basic AOZ1013 application circuit is shown in
Figure 1. Component selection is explained below.
Input capacitor
The input capacitor must be connected to the V
pin
and PGND pin of the AOZ1013 to maintain steady
input voltage and filter out the pulsing input current.
The voltage rating of input capacitor must be greater
than maximum input voltage plus ripple voltage.
The input ripple voltage can be approximated by
equation below:
I
V
×
×
Since the input current is discontinuous in a buck
converter, the current stress on the input capacitor is
another concern when selecting the capacitor. For a
buck circuit, the RMS value of input capacitor current
can be calculated by:
IN
O
IN
O
IN
O
C
IN
V
V
V
V
f
×
=
)
1
)
1
_
IN
O
IN
O
O
RMS
CIN
V
V
V
V
I
I
×
=
if let
m
equal the conversion ratio:
m
V
V
IN
O
=
The relation between the input capacitor RMS current
and voltage conversion ratio is calculated and shown
in Fig. 2 below. It can be seen that when V
is half of
V
, C
is under the worst current stress. The worst
current stress on C
IN
is 0.5·I
O
.
0
0
0.5
m
1
0
0.1
0.2
0.3
0.4
0.5
0.5
0
ICIN_RMSm
IO
( )
1
Figure 2. I
CIN
vs. voltage conversion ratio
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|---|---|
| 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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| 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 標準包裝: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 標準包裝: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 |
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