- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367416 > L5994 (意法半導(dǎo)體) ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER PDF資料下載
參數(shù)資料
| 型號(hào)： | L5994 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| 中文描述： | 可調(diào)三路輸出電源控制器 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大?。?/td> | 301K |
| 代理商： | L5994 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁當(dāng)前第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁
15/26
L5994 - L5994A
+3.3V Inductor
To define the inductor, it is necessary to determine firstly the inductance value. Its minimum value is given by:
and a value L
3
> L
3MIN
should be selected. Core geometry selection is connected to the requirements of the
specific application in terms of space utilization and other practical issues like ease of mounting, availability and
so on. As to the material, the choice should be directed towards ferrite, molypermalloy or KoolM
μ
, to achieve
high efficiency. These materials provide low core losses (ferrite in particular), so that the design can be concen-
trated on preventing saturation and limiting copper losses. Saturation must be avoided even at maximum peak
current:
To limit copper losses, the winding DC resistance, R
L
, should be as low as possible (in the range of m
). AC
losses can usually be neglected. A practical criterion to minimize DC resistance could be to use the largest wire
that fits the selected core.
Anyway the best solution, whenever possible, is to use an off-the-shelf inductor which meets the requirements
in terms of inductance and maximum DC current. Nowadays there is a broad range of products offered by man-
ufacturer, also for surface mount assemblies.
+5.1V Transformer
The primary winding carries the secondary power as well, thus the total primary average current is:
where V
DRLIN
is the voltage generated during the recirculation of the primary and fed into the input of the +12V
linear regulator. The turns ratio 1:n of the transformer is chosen so that V
DRLIN
is above 13V. To reduce the
turns ratio in order to minimize stray parameters, the secondary is referred to the 5.1V output, and therefore the
minimum value is given by:
where V
f
is the forward drop across the rectifier (assume 1V to be conservative). Make sure the secondary is
connected with the proper polarity (see fig. 4). The minimum primary inductance value can be expressed as:
where RF, to get positive values for L
5PMIN
, must satisfy the inequality:
and where V
IN
can be either V
INMIN
or V
INMAX
, whichever gives the higher value for L
5PMIN
. With a primary in-
ductance L
5P
> L
5PMIN
the primary peak current, which must not saturate the magnetic core, will be:
(
2 f
SW
L
5P
V
INMAX
As to the transformer realization, the considerations regarding to the +3.3V inductor can be here repeated.
L
3MIN
3.3
V
)
V
INMAX
f
SW
I
OUT3
RF
-----------------–
=
I
L3PK
I
OUT3
3.3
2 f
SW
L
3
V
INMAX
)
-------------------------------------–
+
=
I
TOT5
I
OUT5
V
I
5.1
----------------------------------------
+
=
η
MIN
V
-------------------------------------------
5.1
–
V
f
+
5.1
=
L
5pmin
3
4
--
5.1
V
V
IN
5.1
–
)
2
V
IN
f
SW
I
TOT5
RF
(
)
η
–
V
IN
I
OUT12
[
]
---------------------------------------------------------------------------–
=
RF
η
V
I
I
TOT5
V
IN
5.1
–
)
------------------------------------------------
>
I
5PK
I
5TOT
)
---------------------------------------–
η
I
OUT12
+
+
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L5995 | Current-Mode SMPS Controller |
| L6116LDC25 | x8 SRAM |
| L6116LDC35 | x8 SRAM |
| L6116LDM12 | x8 SRAM |
| L6116LDM15 | x8 SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5994_02 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5994A | 功能描述:監(jiān)控電路 ADJT TRIPLE OUTPUT POWER SUPPLY CNTLR RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| L5995 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| L5996 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT DYNAMIC DAC CONTROLLER FOR MOBILE CPU |
| L-59BL/1EGW | 制造商:Kingbright Corporation 功能描述: 制造商:Kingbright Corporation 功能描述:LED 5MM RED/GREEN 40MCD/60MCD 制造商:Kingbright Corporation 功能描述:LED, 5MM, RED/GREEN, 40MCD/60MCD 制造商:Kingbright Corporation 功能描述:LED, 5MM, RED/GREEN, 40MCD/60MCD, LED Colour:Red, Green, Height:7.24mm, Width:7. 制造商:Kingbright Corporation 功能描述:Red/grn r/a cbi,5mm,L-59BL/1EGW |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。