- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375341 > AOZ1210AI (ALPHA) EZBuck⑩ 2A Simple Buck Regulator PDF資料下載
參數(shù)資料
| 型號： | AOZ1210AI |
| 廠商： | ALPHA |
| 英文描述： | EZBuck⑩ 2A Simple Buck Regulator |
| 中文描述： | EZBuck⑩甲簡單降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 583K |
| 代理商： | AOZ1210AI |
AOZ1210
Rev. 1.3 December 2007
www.aosmd.com
Page 7 of 14
Detailed Description
The AOZ1210 is a current-mode step down regulator with
integrated high side NMOS switch. It operates from a
4.5V to 27V input voltage range and supplies up to 2A of
load current. The duty cycle can be adjusted from 6% to
85% allowing a wide range of output voltages. Features
include; enable control, Power-On Reset, input under
voltage lockout, fixed internal soft-start and thermal shut
down.
The AOZ1210 is available in SO-8 package.
Enable and Soft Start
The AOZ1210 has an internal soft start feature to limit
in-rush current and ensure the output voltage ramps up
smoothly to the regulation voltage. A soft start process
begins when the input voltage rises to 4.1V and voltage
on EN pin is HIGH. In the soft start process, the output
voltage is typically ramped to regulation voltage in
4
ms.
The
4.0
ms soft start time is set internally.
If the enable function is not used, connect the EN pin to
V
IN
. Pulling EN to ground will disable the AOZ1210. Do
not leave EN open. The voltage on the EN pin must be
above 2.5 V to enable the AOZ1210. When voltage on
EN pin falls below 0.6V, the AOZ1210 is disabled. If an
application circuit requires the AOZ1210 to be disabled,
an open drain or open collector circuit should be used to
interface with the EN pin.
Steady-State Operation
Under steady-state conditions, the converter operates in
fixed frequency and Continuous-Conduction Mode
(CCM).
The AOZ1210 integrates an internal N-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. Since the N-MOSFET requires a
gate voltage higher than the input voltage, a boost
capacitor connected between the LX and BST pins drives
the gate. The boost capacitor is charged while LX is low.
An internal 10
switch from LX to GND is used to ensure
that LX is pulled to GND even in the light load. 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. The
current signal is the sum of inductor current signal and
ramp compensation signal, at the 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 freewheel-
ing through the Schottky diode to the output.
Switching Frequency
The AOZ1210 switching frequency is fixed and set by
an internal oscillator. The switching frequency is set to
370kHz.
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
network includes R
1
and R
2
. Typically, a design is started
by picking a fixed R
2
value and calculating the required
R
1
value with equation below.
R
1
R
2
Some standard values for R
1
and R
2
for the most
commonly used output voltages are listed in Table 1.
Table 1.
The combination of R
1
and R
2
should be large enough to
avoid drawing excessive current from the output, which
will cause power loss.
Protection Features
The AOZ1210 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 AOZ1210 employs peak
current mode control, the COMP pin voltage is propor-
tional 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.
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
0.8
1
------
+
×
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AP01C | 1000V,Fast-Recovery Rectifier Diodes(1000V,快速恢復(fù)整流二極管) |
| AP01 | 8 Channel Power MOSFET Array Monolithic N-channel Enchancement Mode |
| AP0116 | AB 7C 7#16 PIN RECP |
| AP0116NA | ER 7C 7#16S PIN RECP |
| AP0116NB | 8 Channel Power MOSFET Array Monolithic N-channel Enchancement Mode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AOZ1210-EVA | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck⑩ 2A Simple Buck Regulator Evaluation Board Note |
| AOZ1212 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBuck 3A Simple Buck Regulator |
| AOZ1212AI | 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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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 |
| AOZ1212DI | 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: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 |
| AOZ1213 | 制造商:AOSMD 制造商全稱:Alpha & Omega Semiconductors 功能描述:EZBucka?￠ 3A Simple Buck Regulator with Linear Controller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。