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參數(shù)資料
| 型號(hào)： | AT9933 |
| 廠商： | Supertex, Inc. |
| 英文描述： | Hysteretic Boost-Buck (cuk) LED Driver IC |
| 中文描述： | 遲滯升降壓（衍射儀）LED驅(qū)動(dòng)IC |
| 文件頁(yè)數(shù)： | 8/9頁(yè) |
| 文件大小： | 525K |
| 代理商： | AT9933 |
8
AT9933
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
=
(7)
Using
IO = 350mA
and
ΔI
O
= 87.5mA
in (1) and (2),
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%
R
REF1
= 10kΩ, 1/8W, 1%
R
S1
= 4.42kΩ, 1/8W, 1%
I
IN PK
0.85
= 2.1A
1.05
R
CS2
R
S2
R
REF2
= 1.78
= 0.5625
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT9933DB1 | 功能描述:LED照明驅(qū)動(dòng)器 HYSTERIC BOOST-BUCK LED DRIVER DEMO BOARD RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| AT9933LG | 制造商:Supertex Inc 功能描述: |
| AT9933LG-G | 功能描述:LED照明驅(qū)動(dòng)器 HYSTERIC BOOST BUCK LED DRIVER IC RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| AT9946 | 功能描述:開關(guān)配件 Accessory BatteryBox RoHS:否 制造商:C&K Components 類型:Cap 用于:Pushbutton Switches 設(shè)計(jì)目的: |
| AT-9946-091B | 制造商:Nihon Dempa Kogyo Co (NDK) 功能描述:Push button switch |
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