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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  
D1  
L1  
2.2µH  
R4  
10K  
VIN  
VOUT  
Schottky  
JP1  
U1  
VP  
EN/SET FB1  
1
2
3
4
5
6
12  
11  
10  
9
3
2
1
LIN  
R1  
78.7k  
SEL  
VIN  
N/C  
SW  
FB2  
GND  
PGND  
SW  
8
Enable  
JP2  
C2  
2.2µF  
7
C1  
2.2µF  
R2  
562  
3
2
1
R3  
4.99k  
Select  
U1 AAT1230/1230-1 TSOPJW12  
C1 10V 0603 2.2µF  
C2 25V 0805 2.2µF  
D1 30V 0.5A MBR0530T1 SOD-123  
L1 2.2µH SD3814-2R2  
R1 78.7k 0603  
R2 562 0603  
R3 4.99k 0603  
Figure 1: AAT1230/1230-1 Demo Board Schematic.  
transferred from the input battery and boost induc-  
tor to the output load through the output diode.  
Duty cycle is defined as the ON time divided by the  
total switching interval.  
Application Information  
Selecting the Output Diode  
To ensure minimum forward voltage drop and no  
recovery, high voltage Schottky diodes are consid-  
ered the best choice for the AAT1230/1230-1 boost  
converter. The AAT1230/1230-1 output diode is  
sized to maintain acceptable efficiency and reason-  
able operating junction temperature under full load  
operating conditions. Forward voltage (VF) and  
package thermal resistance (θJA) are the dominant  
factors to consider in selecting a diode. The diode's  
published current rating may not reflect actual oper-  
ating conditions and should be used only as a com-  
parative measure between similarly rated devices.  
20V rated Schottky diodes are recommended for  
outputs less than 15V, while 30V rated Schottky  
diodes are recommended for outputs greater than  
15V.  
TON  
D =  
TON + TOFF  
= TON FS  
The maximum duty cycle can be estimated from  
the relationship for a continuous mode boost con-  
verter. Maximum duty cycle (DMAX) is the duty  
cycle at minimum input voltage (VIN(MIN)).  
VOUT - VIN(MIN)  
VOUT  
DMAX  
=
The switching period is divided between ON and  
OFF time intervals.  
The average diode current during the OFF time can  
be estimated.  
1
= TON + TOFF  
FS  
IOUT  
1 - DMAX  
IAVG(OFF)  
=
During the ON time, the N-channel power MOS-  
FET is conducting and storing energy in the boost  
inductor. During the OFF time, the N-channel  
power MOSFET is not conducting. Stored energy is  
The following curves show the VF characteristics  
for different Schottky diodes (100°C case). The VF  
of the Schottky diode can be estimated from the  
average current during the off time.  
10  
1230.2006.10.1.4  
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