參數(shù)資料
型號(hào)： AT9933LG-G
廠商： SUPERTEX INC
元件分類： 穩(wěn)壓器
中文描述： SWITCHING CONTROLLER, PDSO8
封裝： 4.90 X 3.90 MM, 1.75 MM HEIGHT, 1.27 MM PITCH, GREEN, MS-012AA, SOIC-8
文件頁(yè)數(shù)： 8/9頁(yè)
文件大?。?/td> 505K
代理商： AT9933LG-G
8
AT9933
Supertex inc.
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
Assuming a 30% peak-to-peak ripple when the converter is
in input current limit mode, the minimum value of the input
current will be:
I
LIM,MIN
= 0.85 I
IN,LIM
(5)
Setting
I
LIM,MIN
= 1.05 I
IN,PK
(6)
The current level to limit the converter can then be com-
puted.
I
IN,LIM
= (1.05 / 0.85) X I
IN,PK
= 2.1A
(7)
Using
I
O
= 350mA
and
ΔI
O
= 87.5mA
in (1) and (2),
R
CS2
= 1.78Ω
R
S2
/ R
REF2
= 0.5625
Before the design of the output side is complete, over voltage
protection has to be included in the design. For this applica-
tion, choose a 33V zener diode. This is the voltage at which
the output will clamp in case of an open LED condition. For
a 350mW diode, the maximum current rating at 33V works
out to about 10mA. Using a 2.5mA current level during open
LED conditions, and assuming the same
R
S2
/R
REF2
ratio,
R
CS2
+ R
S2A
= 120Ω
(8)
Choose the following values for the resistors:
R
CS2
= 1.65Ω, 1/4W, 1%
R
REF2
= 10kΩ, 1/8W, 1%
R
S2A
= 100Ω, 1/8W, 1%
R
S2B
= 5.23kΩ, 1/8W, 1%
The current sense resistor needs to be at least a 1/4W, 1%
resistor.
Similarly, using
I
IN
= 2.1A
and
ΔI
IN
= 0.3xI
IN
= 0.63
in (1) and
(2):
R
S1
/ R
REF1
= 0.442
R
CS1
= 0.228Ω
P
RCS1
= I
2
IN,LIM
R
CS1
= 1W
Choose the following values for the resistors:
R
CS1
= parallel combination of three 0.68Ω, 1/2W,
5% resistors
R
REF1
= 10kΩ, 1/8W, 1%
R
S1
= 4.42kΩ, 1/8W, 1%
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