參數(shù)資料
型號: AS1326B-BTDT
廠商: AUSTRIAMICROSYSTEMS AG
元件分類: DC/DC變換器
英文描述: Adj. 650mA, 1MHz, Boost; Package Type: TDFN(3x3)-10; Miscellaneous: Logic-High On
中文描述: 高電流0.8A的DC - DC升壓轉(zhuǎn)換器
封裝: TDFN(3x3)-10
文件頁數(shù): 12/18頁
文件大?。?/td> 1108K
代理商: AS1326B-BTDT
www.austriamicrosystems.com
Revision 1.05
12 - 18
AS1326
Datasheet - Application Information
Setting the Switch Current Limit
The ISET pin is used to adjust the inductor current limit and to implement the soft-start feature.
With pin ISET connected to pin REF, the inductor current limit is set to 1.6A. With ISET connected to a resistor-divider
network from pin REF to GND, the current limit is calculated as:
Soft Start
The soft-start feature can be implemented by placing a resistor between pin ISET and pin REF
(see Figure 21)
and a
capacitor between pin ISET and GND.
Figure 21. Circuit for Soft-Start with Maximum Switch Current Limit
At power-up, ISET is 0V and the LX current is zero. As the capacitor voltage rises, the current increases and the output
voltage rises. The soft-start time constant is:
Where:
R
SS
220k
Ω
.
Note:
Placing a capacitor across the lower resistor of the current-limiting resistor-divider network enables both the
current-limit and soft-start
(see Figure 22)
.
Figure 22. Application Circuit for Soft-Start with Reduced Switch Current Limit
(EQ 2)
I
LIMIT
1,6A
1,25V
---------------
=
R
SS
220k
Ω
C
SS
1
ISET
2
REF
AS1326A/
AS1326B
10nF
I
LIMIT
= 1.6A
t
SS
= Rss x C
SS
(EQ 3)
t
SS
= R
SS
x C
SS
C
SS
1
ISET
2
REF
AS1326A/
AS1326B
10nF
t
SS
= (Rss
1
|| Rss
2
) C
SS
R
SS2
R
SS
220k
Ω
I
LIMIT
= 1.6A
Rss
2
Rss
1 +
Rss
2
(
)
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