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AAT1230ITP-1-T1 参数 Datasheet PDF下载

AAT1230ITP-1-T1图片预览
型号: AAT1230ITP-1-T1
PDF下载: 下载PDF文件 查看货源
内容描述: 18V 100毫安升压转换器 [18V 100mA Step-Up Converter]
分类和应用: 转换器稳压器开关式稳压器或控制器电源电路开关式控制器升压转换器
文件页数/大小: 21 页 / 533 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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AAT1230/1230-1  
18V 100mA Step-Up Converter  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
EMI performance when applied to the SW node  
(switching) of the AAT1230/1230-1.  
VIN = 3.0V  
OUT = 12V  
VIN = 3.0V  
OUT = 10V  
VIN = 3.6V  
OUT = 12V  
VIN = 3.6V  
VOUT = 10V  
V
V
V
Shielded inductors provide decreased EMI and may  
be required in noise sensitive applications.  
Unshielded chip inductors provide significant space  
savings at a reduced cost compared to shielded  
(wound and gapped) inductors. In general, chip-  
type inductors have increased winding resistance  
(DCR) when compared to shielded, wound varieties.  
VIN = 2.7V  
OUT = 10V  
VIN = 2.7V  
VOUT = 12V  
V
40  
50  
60  
70  
80  
90  
100  
Output Current (mA)  
Selecting the Boost Capacitors  
The high output ripple inherent in the boost con-  
verter necessitates low impedance output filtering.  
Multi-layer ceramic (MLC) capacitors provide small  
size and adequate capacitance, low parasitic  
equivalent series resistance (ESR) and equivalent  
series inductance (ESL), and are well suited for  
use with the AAT1230/1230-1 boost regulator.  
MLC capacitors of type X7R or X5R are recom-  
mended to ensure good capacitance stability over  
the full operating temperature range.  
IOUT  
(1 - DMAX  
DMAX  
·
·
FS L)  
VIN(MIN)  
·
IPEAK  
=
+
)
(2  
At light load and low output voltage, the controller  
reduces the operating frequency to maintain maxi-  
mum operating efficiency. As a result, further  
reduction in output load does not reduce the peak  
current. Minimum peak current can be estimated  
from 0.5A to 0.75A.  
The RMS current flowing through the boost induc-  
tor is equal to the DC plus AC ripple components.  
Under worst-case RMS conditions, the current  
waveform is critically continuous. The resulting  
RMS calculation yields worst-case inductor loss.  
The RMS current value should be compared  
against the manufacturer's temperature rise, or  
thermal derating, guidelines.  
The output capacitor is sized to maintain the output  
load without significant voltage droop (ΔVOUT) dur-  
ing the power switch ON interval, when the output  
diode is not conducting. A ceramic output capaci-  
tor from 2.2µF to 4.7µF is recommended. Typically,  
25V rated capacitors are required for the 18V boost  
output. Ceramic capacitors sized as small as 0805  
are available which meet these requirements.  
MLC capacitors exhibit significant capacitance  
reduction with applied voltage. Output ripple  
measurements should confirm that output voltage  
droop is acceptable. Voltage derating can mini-  
mize this factor, but results may vary with package  
size and among specific manufacturers.  
IPEAK  
IRMS  
=
3
For a given inductor type, smaller inductor size leads  
to an increase in DCR winding resistance and, in  
most cases, increased thermal impedance. Winding  
resistance degrades boost converter efficiency and  
increases the inductor’s operating temperature.  
Output capacitor size can be estimated at a switch-  
ing frequency (FSW) of 500kHz (worst-case).  
IOUT · DMAX  
FS · ΔVOUT  
PLOSS(INDUCTOR) = IRMS2 · DCR  
COUT =  
The boost converter input current flows during both  
ON and OFF switching intervals. The input ripple  
current is less than the output ripple and, as a result,  
less input capacitance is required. A ceramic output  
capacitor from 1µF to 3.3µF is recommended.  
To ensure high reliability, the inductor temperature  
should not exceed 100ºC. In some cases, PCB  
heatsinking applied to the AAT1230/1230-1 LIN  
node (non-switching) can improve the inductor's  
thermal capability. PCB heatsinking may degrade  
12  
1230.2006.10.1.4  
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