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參數(shù)資料
| 型號： | AOZ1012D |
| 廠商： | ALPHA |
| 英文描述： | EZBuck⑩ 3A Simple Buck Regulator |
| 中文描述： | EZBuck⑩3A條簡單的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 807K |
| 代理商： | AOZ1012D |
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Combination of R1 and R2 should be large enough to
avoid drawing excessive current from the output, which
will cause power loss.
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
AOZ1012D 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 AOZ1012D 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 since the limitation of peak inductor current.
When cycle by cycle current limit circuit is triggered, the
output voltage drops as the duty cycle decreasing.
The AOZ1012D has internal short circuit protection
circuit 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 stop switching.
April 2006
www.aosmd.com
Page 9 of 17
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 regulator will restart automatically
under the control of soft-start circuit when the junction
temperature decreases to 100oC.
Application Information
The basic AOZ1012D 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 AOZ1012D 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
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
.
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| AOZ1012DI | EZBuck⑩ 3A Simple Buck Regulator |
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| AOZ1014 | EZBuck TM 5A Simple Buck Regulator |
| AOZ1014AI | EZBuck TM 5A Simple Buck Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
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| 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 |
| AOZ1014 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck TM 5A Simple Buck Regulator |
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