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AS1312-BWLT-50 PDF预览

AS1312-BWLT-50

更新时间: 2024-02-01 01:24:24
品牌 Logo 应用领域
艾迈斯 - AMSCO /
页数 文件大小 规格书
20页 577K
描述
Ul t ra Low Quiescent Cur rent , Hysteret ic DC-DC Step-Up Conver ter

AS1312-BWLT-50 数据手册

 浏览型号AS1312-BWLT-50的Datasheet PDF文件第5页浏览型号AS1312-BWLT-50的Datasheet PDF文件第6页浏览型号AS1312-BWLT-50的Datasheet PDF文件第7页浏览型号AS1312-BWLT-50的Datasheet PDF文件第9页浏览型号AS1312-BWLT-50的Datasheet PDF文件第10页浏览型号AS1312-BWLT-50的Datasheet PDF文件第11页 
AS1312  
Datasheet - Detailed Description  
Figure 10. 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  
TOFF TWAIT  
IL  
SW1_on  
SW2_off  
IPK  
0
T
SW2_on  
SW1_off  
T
T
Another important relationship is the “volt-seconds” law. Expressed as following:  
VONTON = VOFFTOFF  
(EQ 4)  
Voltages are those measured across the inductor during each time segment. Figure 10 shows this graphically with the shaded segments marked  
“A & B”. Re-arranging (EQ 4):  
TON  
------------  
TOFF  
VOUT VIN  
----------------------------  
VIN  
=
(EQ 5)  
The time segment called T  
in Figure 10 is a measure of the “hold-up” time of the output capacitor. While the output voltage is above the  
WAIT  
threshold (0.99xVOUT), the output is assumed to be in regulation and no further switching occurs.  
8.1.2 Inductor Choice Example  
For the AS1312 V  
= 0.9V, V  
= 3.3V, (EQ 5) gives Ton=2.66T  
.
IN_MIN  
OUT_MAX  
OFF  
Let the maximum operating on-time = 1µs.  
Note that this is shorter than the minimum limit on-time of 3.6µs. Therefore from (EQ 5), T  
= 0.376µs. Using (EQ 3), L  
is obtained:  
MAX  
OFF  
L
MAX  
= 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.ams.com/DC-DC_Step-Up  
Revision 1.12  
8 - 20  

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