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| 型号： | AOZ1232QI-01 |
| 厂商： | Alpha & Omega Semiconductor Inc |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 30LQFN |
| 标准包装： | 3,000 |
| 系列： | EZBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 23.8 V |
| 输入电压： | 2.7 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz ~ 1MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 30-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 30-QFN（5x5） |
AOZ1232-01
Application Information
The basic AOZ1232-01 application circuit is shown in
pages 2 and 3. Component selection is explained below.
Input Capacitor
The input capacitor must be connected to the IN pins and
PGND pin of the AOZ1232-01 to maintain steady input
voltage and filter out the pulsing input current. A small
decoupling capacitor, usually 1 ? F, should be connected
to the VCC pin and AGND pin for stable operation of the
AOZ1232-01. The voltage rating of input capacitor must
be greater than maximum input voltage plus ripple
voltage.
For reliable operation and best performance, the input
capacitors must have current rating higher than I CIN-RMS
at worst operating conditions. Ceramic capacitors are
preferred for input capacitors because of their low ESR
and high ripple current rating. Depending on the
application circuits, other low ESR tantalum capacitor or
aluminum electrolytic capacitor may also be used. When
selecting ceramic capacitors, X5R or X7R type dielectric
ceramic capacitors are preferred for their better
temperature and voltage characteristics. Note that the
ripple current rating from capacitor manufactures is
based on certain amount of life time. Further de-rating
may be necessary for practical design requirement.
The input ripple voltage can be approximated by
? I L = ----------- ? ? ?
f ? L
I CIN_RMS = I O ? --------- ? 1 – --------- ?
I Lpeak = I O + --------
V O
equation below:
I O ? V O ? V O
----------------- ? ? 1 – --------- ? ? ---------
f ? C IN ? V IN ? V IN
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:
V O ? V O ?
V IN ? V IN ?
if let m equal the conversion ratio:
--------- = m
V IN
The relation between the input capacitor RMS current
and voltage conversion ratio is calculated and shown in
Figure 3. It can be seen that when V O is half of V IN , C IN it
is under the worst current stress. The worst current
stress on C IN is 0.5 x I O .
0.5
0.4
I CIN_RMS (m ) 0.3
Inductor
The inductor is used to supply constant current to output
when it is driven by a switching voltage. For given input
and output voltage, inductance and switching frequency
together decide the inductor ripple current, which is:
V O ? V O ?
1 – ---------
? V IN ?
The peak inductor current is:
? I L
2
High inductance gives low inductor ripple current but
requires a larger size inductor to avoid saturation. Low
ripple current reduces inductor core losses. It also
reduces RMS current through inductor and switches,
which results in less conduction loss. Usually, peak to
peak ripple current on inductor is designed to be 30% to
50% of output current.
When selecting the inductor, make sure it is able to
handle the peak current without saturation even at the
highest operating temperature.
The inductor takes the highest current in a buck circuit.
The conduction loss on the inductor needs to be checked
for thermal and efficiency requirements.
Surface mount inductors in different shapes and styles
are available from Coilcraft, Elytone and Murata.
I O
0.2
0.1
Shielded inductors are small and radiate less EMI noise,
but they do cost more than unshielded inductors. The
choice depends on EMI requirement, price and size.
0
0
0.5
1
m
Figure 3. I CIN vs. Voltage Conversion Ratio
Rev. 1.3 October 2012
www.aosmd.com
Page 11 of 18
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相关代理商/技术参数 |
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| AOZ1235QI-01 | 制造商:Alpha & Omega Semiconductor 功能描述:2.7V-28V 10A COT EZBUCK REGULA 制造商:Alpha & Omega Semiconductor 功能描述:IC REGULATOR |
| AOZ1236QI-01 | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 6A 23-VFQFN Exposed Pad 制造商:alpha & omega semiconductor inc. 系列:EZBuck?? 包装:带卷（TR） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:28V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:23.8V 电流 - 输出:6A 频率 - 开关:200kHz ~ 1MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:23-VFQFN 裸露焊盘 供应商器件封装:23-QFN（4x4） 标准包装:3,000 |
| AOZ1236QI-02 | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 6A 23-VFQFN Exposed Pad 制造商:alpha & omega semiconductor inc. 系列:EZBuck?? 包装:带卷（TR） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:24V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:20.4V 电流 - 输出:6A 频率 - 开关:200kHz ~ 1MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:23-VFQFN 裸露焊盘 供应商器件封装:23-QFN（4x4） 标准包装:3,000 |
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