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AS1310-BTDT-27 参数 Datasheet PDF下载

AS1310-BTDT-27图片预览
型号: AS1310-BTDT-27
PDF下载: 下载PDF文件 查看货源
内容描述: 超低静态电流,滞回DC-DC升压转换器 [Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter]
分类和应用: 转换器升压转换器
文件页数/大小: 20 页 / 1271 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1310  
Datasheet - Detailed Description  
Figure 13. Simplified Voltage and Current Waveforms  
V
0.99VOUT_NOM  
VOUT  
VOUT Ripple  
VIND_TOFF  
B
C
B
C
VIN  
0
VIND_TON  
D
A
D
T
TOFF TWAIT  
TON  
OFF TWAIT  
IL  
_on  
Soff  
IPK  
0
T
S_o
SW1_off  
T
Another important relationship is the “volt-seconds” law. xpressed as following:  
VONTON = VOFFTOFF  
(EQ 4)  
Voltages are those measured across the ductoduring each time segment. Figure 13 shows this graphically with the shaded segments marked  
“A & B”. Re-arranging (EQ 4):  
T
V
OUT VIN  
------O---N---  
TOFF  
----------------------------  
=
(EQ 5)  
VIN  
The time segment callTWAIT in Figure 13 is a measure of the “hold-up” time of the output capacitor. While the output voltage is above the  
threshold (0.99xVUT), thoutput is assumed to be in regulation and no further switching occurs.  
8.1.2 Inductor Choice Example  
Fothe A10 IN_MIN = 0.9V, VOUT_MAX = 3.3V, (EQ 5) gives Ton=2.66TOFF  
.
Let te maximum operating on-time = 1µs.  
Note ththis is shorter than the minimum limit on-time of 3.6µs. Therefore from (EQ 5), TOFF = 0.376µs. Using (EQ 3), LMAX is obtained:  
LMAX = 1.875µH. The nearest preferred value is 2.2µH.  
This value provides the maximum energy storage for the chosen fixed on-time limit at the minimum VIN.  
www.austriamicrosystems.com/DC-DC_Step-Up/AS1310  
Revision 1.8  
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