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參數(shù)資料
| 型號： | AOZ1017 |
| 廠商： | ALPHA |
| 英文描述： | EZBuck⑩ 3A Simple Regulator |
| 中文描述： | EZBuck⑩3A條簡單的穩(wěn)壓 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 612K |
| 代理商： | AOZ1017 |
AOZ1017
Rev. 1.0 July 2007
www.aosmd.com
Page 7 of 16
Detailed Description
The AOZ1017 is a current-mode step down regulator with
integrated high side PMOS switch. It operates from a
4.5V to 16V input voltage range and supplies up to 3A of
load current. The duty cycle can be adjusted from 6% to
100% allowing a wide range of output voltage. Features
include Enable Control, Power-On Reset, Input Under
Voltage Lockout, Fixed Internal Soft-Start and Thermal
Shut Down.
The AOZ1017 is available in SO-8 package.
Enable and Soft Start
The AOZ1017 has internal soft start feature to limit
in-rush current and ensure the output voltage ramps up
smoothly to regulation voltage. A soft start process
begins when the input voltage rises to 4.0V and voltage
on EN pin is HIGH. In the soft start process, the output
voltage is typically ramped to regulation voltage in 2.2ms.
The 2.2ms soft start time is set internally.
The EN pin of the AOZ1017 is active HIGH. Connect the
EN pin to V
IN
if enable function is not used. Pulling EN to
ground will disable the AOZ1017. Do not leave it open.
The voltage on EN pin must be above 2.0 V to enable the
AOZ1017. When voltage on EN pin falls below 0.6V, the
AOZ1017 is disabled. If an application circuit requires the
AOZ1017 to be disabled, an open drain or open collector
circuit should be used to interface to the EN pin.
Steady-State Operation
Under steady-state conditions, the converter operates in
fixed frequency and Continuous-Conduction Mode
(CCM).
The AOZ1017 integrates an internal P-MOSFET as the
high-side switch. Inductor current is sensed by amplifying
the voltage drop across the drain to source of the high
side power MOSFET. Output voltage is divided down by
the external voltage divider at the FB pin. The difference
of the FB pin voltage and reference is amplified by the
internal transconductance error amplifier. The error
voltage, which shows on the COMP pin, is compared
against the current signal, which is the sum of inductor
current signal and ramp compensation signal, at PWM
comparator input. If the current signal is less than the
error voltage, the internal high-side switch is on. The
inductor current flows from the input through the inductor
to the output. When the current signal exceeds the error
voltage, the high-side switch is off. The inductor current
is freewheeling through the external Schottky diode to
output.
The AOZ1017 uses a P-Channel MOSFET as the high
side switch. It saves the bootstrap capacitor normally
seen in a circuit which is using an NMOS switch. It allows
100% turn-on of the upper switch to achieve linear
regulation mode of operation. The minimum voltage drop
from V
IN
to V
O
is the load current x DC resistance of
MOSFET + DC resistance of buck inductor. It can be
calculated by equation below:
where;
V
O_MAX
is the maximum output voltage,
V
IN
is the input voltage from 4.5V to 16V,
I
O
is the output current from 0A to 3A,
R
DS(ON)
is the on resistance of internal MOSFET, the value is
between 40m
and 70m
depending on input voltage and
junction temperature, and
R
inductor
is the inductor DC resistance.
Switching Frequency
The AOZ1017 switching frequency is fixed and set by
an internal oscillator. The practical switching frequency
could range from 400kHz to 600kHz due to device
variation.
Output Voltage Programming
Output voltage can be set by feeding back the output to
the FB pin with a resistor divider network. In the applica-
tion circuit shown in Figure 1. The resistor divider net-
work includes R
1
and R
2
. Usually, a design is started by
picking a fixed R
2
value and calculating the required R
1
with equation below.
Some standard values of R
1
and R
2
for most commonly
used output voltage values are listed in Table 1.
Table 1.
V
O
(V)
R
1
(k
)
R
2
(k
)
0.8
1.0
open
1.2
4.99
10
1.5
10
11.5
1.8
12.7
10.2
2.5
21.5
10
3.3
31.6
10
5.0
52.3
10
V
O_MAX
V
IN
I
O
R
DS ON
)
R
inductor
+
(
)
×
–
=
V
O
0.8
1
R
1
R
2
------
+
×
=
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| AOZ1210 | EZBuck⑩ 2A Simple Buck Regulator |
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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) 供應商設備封裝: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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