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參數(shù)資料
| 型號： | AOZ1015 |
| 廠商： | ALPHA |
| 英文描述： | EZBuck⑩ 1.5A Synchronous Buck Regulator |
| 中文描述： | EZBuck⑩1.5A的同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大?。?/td> | 715K |
| 代理商： | AOZ1015 |
AOZ1015
Rev. 1.2 September 2007
www.aosmd.com
Page 8 of 15
The combination of R
2
and R
3
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
The AOZ1015 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 the AOZ1015 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
2.
0
A and 3.6A. 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
decreases.
The AOZ1015 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 equal to 1/8 of normal switching frequency.
The converter will start up via a soft start once the short
circuit condition is resolved. In short circuit protection
mode, the inductor average current is greatly reduced
because of the low hiccup frequency.
Output Over Voltage Protection (OVP)
The AOZ1015 monitors the feedback voltage. When the
feedback voltage is higher than 960mV, it immediately
turns-off the PMOS to protect the output voltage
overshoot at fault condition. When feedback voltage is
lower than
86
0mV, the PMOS is allowed to turn on in
the next cycle.
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.
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
150°C.
Application Information
The basic AOZ1015 application circuit is shown in
Figure 1. Component selection is explained below.
Input Capacitor
The input capacitor (C
1
in Figure 1) must be connected
to the V
IN
pin and PGND pin of the AOZ1015 to maintain
steady input voltage and filter out the pulsing input
current. A small decoupling capacitor (C
d
in Figure 1),
usually 1μF, should be connected to the V
IN
pin and
AGND pin for stable operation of the AOZ1015. 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:
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:
If let
m
equal the conversion ratio:
The relationship between the input capacitor RMS current
and voltage conversion ratio is calculated and shown in
Figure 2. It can be seen that when V
O
is half of V
IN
, C
IN
is
under the worst current stress. The worst current stress
on C
IN
is 0.5 x I
O
.
V
IN
I
C
IN
f
×
------------------
1
V
V
IN
----------
–
V
V
IN
----------
×
×
=
I
CIN_RMS
I
O
V
V
IN
----------
1
V
V
IN
----------
–
×
=
V
V
IN
----------
m
=
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| AOZ1015AI | EZBuck⑩ 1.5A Synchronous Buck Regulator |
| AOZ1016 | EZBuck⑩ 2A Simple Buck Regulator |
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相關(guān)代理商/技術(shù)參數(shù) |
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| AOZ1015AI | 功能描述:IC REG BUCK ADJ 1.5A 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:升壓（升壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，2 V ~ 16.5 V 輸入電壓:2 V ~ 16.5 V PWM 型:- 頻率 - 開關(guān):45kHz 電流 - 輸出:50mA 同步整流器:無 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:8-PDIP |
| AOZ1015-EVA | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 1.5A Simple Buck Regulator Evaluation Board Note |
| AOZ1016 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 2A Simple Buck Regulator |
| AOZ1016AI | 功能描述:IC REG BUCK ADJ 2A 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 |
| AOZ1016AIL | 功能描述:IC REG BUCK ADJ 2A 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 |
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