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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  
10000  
1000  
100  
Selecting the Boost Inductor  
B340LA  
The AAT1230/1230-1 controller utilizes hysteretic  
control and the switching frequency varies with  
output load and input voltage. The value of the  
inductor determines the maximum switching fre-  
quency of the AAT1230/1230-1 boost converter.  
Increased output inductance decreases the switch-  
ing frequency, resulting in higher peak currents and  
increased output voltage ripple. To maintain 2MHz  
maximum switching frequency and stable opera-  
tion, an output inductor sized from 1.5µH to 2.7µH  
is recommended.  
MBR0530  
ZHCS350  
BAT42W  
10  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
Forward Voltage (V)  
The average diode current is equal to the output  
current.  
A better estimate of DMAX is possible when VF is  
known.  
IAVG(TOT) = IOUT  
(VOUT + VF - VIN(MIN)  
(VOUT + VF)  
)
DMAX  
=
The average output current multiplied by the for-  
ward diode voltage determines the loss of the out-  
put diode.  
Where VF is the Schottky diode forward voltage. If  
not known, it can be estimated at 0.5V.  
Manufacturer’s specifications list both the inductor  
DC current rating, which is a thermal limitation, and  
peak inductor current rating, which is determined  
by the saturation characteristics. Measurements at  
full load and high ambient temperature should be  
completed to ensure that the inductor does not sat-  
urate or exhibit excessive temperature rise.  
PLOSS(DIODE) = IAVG(TOT)  
= IOUT VF  
· VF  
·
Diode junction temperature can be estimated.  
The output inductor (L) is selected to avoid satura-  
tion at minimum input voltage, maximum output load  
conditions. Peak current may be estimated using  
the following equation, assuming continuous con-  
duction mode. Worst-case peak current occurs at  
minimum input voltage (maximum duty cycle) and  
maximum load. Switching frequency can be estimat-  
ed from the curves and assumes a 2.2µH inductor.  
TJ(DIODE) = TAMB + ΘJA · PLOSS(DIODE)  
Output diode junction temperature should be  
maintained below 110ºC, but may vary depending  
on application and/or system guidelines. The  
diode θJA can be minimized with additional PCB  
area on the cathode. PCB heatsinking the anode  
may degrade EMI performance.  
2.0  
VIN = 3.0V  
VOUT = 18V  
VIN = 3.0V  
VOUT = 15V  
The reverse leakage current of the rectifier must be  
considered to maintain low quiescent (input) cur-  
rent and high efficiency under light load. The recti-  
fier reverse current increases dramatically at high  
temperatures.  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
VIN = 3.6V  
VOUT = 18V  
VIN = 3.6V  
VOUT = 15V  
VIN = 2.7V VIN = 2.7V  
VOUT = 18V VOUT = 15V  
40  
50 60  
70  
80  
90  
100  
Output Current (mA)  
1230.2006.10.1.4  
11  
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