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參數(shù)資料
| 型號(hào)： | AOZ1013AI |
| 廠商： | ALPHA |
| 英文描述： | EZBuck TM 3A Simple Buck Regulator |
| 中文描述： | EZBuck商標(biāo)3A條簡(jiǎn)單的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 578K |
| 代理商： | AOZ1013AI |
^lwNMNP
February 2006
www.aosmd.com
Page 8 of 16
Detailed Description
The AOZ1013 is a current-mode step down regulator
with integrated high side PMOS switch and a low side
freewheeling Schottky diode. 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 AOZ1013 is available in SO-8 package.
Enable and Soft Start
The AOZ1013 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 soft start process, the
output voltage is ramped to regulation voltage in
typically 4ms. The 4ms soft start time is set internally.
The EN pin of the AOZ1013 is active high. Connect
the EN pin to VIN if enable function is not used. Pull it
to ground will disable the AOZ1013. Do not leave it
open. The voltage on EN pin must be above 2.0 V to
enable the AOZ1013. When voltage on EN pin falls
below 0.6V, the AOZ1013 is disabled. If an application
circuit requires the AOZ1013 to be disabled, an open
drain or open collector circuit should be used to
interface to EN pin.
Steady-State Operation
Under steady-state conditions, the converter operates
in fixed frequency and Continuous-Conduction Mode
(CCM).
The AOZ1013 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
transconductance error amplifier. The error voltage,
which shows on the COMP pin, is compared against
the current signal, which is 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.
by
the
internal
The AOZ1013 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
to V
is the load current times
DC resistance of MOSFET plus DC resistance of buck
inductor. It can be calculated by equation below:
I
V
V
×
=
Where V
O_MAX
is the maximum output voltage;
V
I
O
is the output current from 0A to 3A;
R
is the on resistance of internal
MOSFET, the value is between 40m
and 70m
depending on input voltage and
junction temperature;
R
inductor
is the inductor DC resistance;
Switching Frequency
The AOZ1013 switching frequency is fixed and set by
an internal oscillator. The practical switching
frequency could range from 350kHz 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
application circuit shown in Figure 1. The resistor
divider network includes R
and R
. Usually, a design
is started by picking a fixed R
value and calculating
the required R1 with equation below.
)
(
)
(
_
inductor
R
ON
DS
O
IN
MAX
O
R
+
)
1
8
2
1
R
R
V
O
+
×
=
Some standard value of R
, R
for most commonly
used output voltage values are listed in Table 1.
Table 1.
Vo (V)
R1 (k
)
0.8
1.0
1.2
4.99
1.5
10
1.8
12.7
2.5
21.5
3.3
31.6
5.0
52.3
Combination of R1 and R2 should be large enough to
avoid drawing excessive current from the output,
which will cause power loss.
R2 (k
)
Open
10
11.5
10.2
10
10
10
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相關(guān)代理商/技術(shù)參數(shù) |
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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 |
| AOZ1014 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck TM 5A Simple Buck Regulator |
| 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 |
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