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AS1326B-BTDT 参数 Datasheet PDF下载

AS1326B-BTDT图片预览
型号: AS1326B-BTDT
PDF下载: 下载PDF文件 查看货源
内容描述: 高电流, 0.8A DC- DC升压转换器 [High Current, 0.8A DC-DC Step-Up Converters]
分类和应用: 转换器升压转换器
文件页数/大小: 18 页 / 1038 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1326  
Data Sheet - Application Information  
9 Application Information  
Figure 19. Typical AS1326A Application Circuit  
3.3µH  
8
VIN = 2.4V  
LX  
10  
+
33µF  
ONN  
6
9
VOUT = 3.3V  
800mA  
CLK/SEL  
1
POUT  
+
100µF  
330nF  
ISET  
2
10Ω  
AS1326A  
5
REF  
4
OUT  
10nF  
FB  
3
GND  
7
PGND  
Setting the Output Voltages  
For a fixed 3.3V output, connect pin FB to GND. To set adjustable output voltages between 2.5 and 5.0V, connect a  
resistor voltage-divider to pin FB from pin OUT to GND (Figure 20).  
Figure 20. Application Circuit using External Feedback Resistors  
3.3µH  
8
VIN = 2.4V  
LX  
10  
+
33µF  
ONN  
6
9
VOUT  
POUT  
+
100µF  
330nF  
CLK/SEL  
1
10Ω  
AS1326A  
5
ISET  
2
OUT  
REF  
R1  
R2  
10nF  
4
FB  
3
GND  
7
PGND  
For the circuit shown in Figure 20, the input bias current into FB is <20nA, permitting large-value resistor-divider net-  
works while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a 270kΩ  
resistor for R2, then calculate R1 as:  
VOUT  
VFB  
1  
--------------  
R1 = R2 ⋅  
(EQ 1)  
Where:  
VFB (the boost-regulator feedback set point) is 1.24V.  
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Revision 1.02  
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