欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: SC403MLTRT
廠商: Semtech
文件頁數: 24/32頁
文件大小: 741K
描述: IC REG DL BCK/LINEAR SYNC 32MLPQ
標準包裝: 1
系列: EcoSpeed®, SmartDrive™
拓撲: 降壓(降壓)同步(1),線性(LDO)(1)
功能: 任何功能
輸出數: 2
頻率 - 開關: 1MHz
電壓/電流 - 輸出 1: 可調至 0.75V,6A
電壓/電流 - 輸出 2: 可調至 0.75V,200mA
帶 LED 驅動器:
帶監控器:
帶序列發生器:
電源電壓: 3 V ~ 28 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤
供應商設備封裝: 32-MLPQ(5x5)
包裝: 標準包裝
其它名稱: SC403MLDKR
SC403
24
Applications Information (continued)
The design goal is that the output voltage regulation be
?% under static conditions. The internal 750mV refer-
ence tolerance is ?%. Allowing ?% tolerance from the
FB resistor divider, this allows 2% tolerance due to V
OUT
 
ripple. Since this 2% error comes from 1/2 of the ripple
voltage, the allowable ripple is 4%, or 60mV for a 1.5V
output.
The maximum ripple current of 3.7A creates a ripple
voltage across the ESR. The maximum ESR value allowed
is shown by the following equations.
A
7
.
3
mV
60
I
V
ESR
RIPPLEMAX
RIPPLE
MAX
   ESR
MAX
 = 16.2 m&
The output capacitance is usually chosen to meet tran-
sient requirements. A worst-case load release, from
maximum load to no load at the exact moment when the
inductor current is at the peak, determines the required
capacitance. If the load release is instantaneous (load
changes from maximum to zero in < 1祍), the output
capacitor must absorb all the inductors stored energy.
This will cause a peak voltage on the capacitor requiring a
capacitance provided by the following equation.
2
OUT
2
PEAK
2
RIPPLEMAX
OUT
MIN
V
V
I
2
1
I
L
COUT
Assuming a peak voltage V
PEAK
 of 1.6V (100mV rise upon
load release), and a 6A load release, the required capaci-
tance is shown by the next equation.
2
2
2
MIN
V
5
.
1
V
6
.
1
A
7
.
3
2
1
A
6
H
5
.
1
COUT
   COUT
MIN
 = 298礔
If the load release is relatively slow, the output capacitance
can be reduced. At heavy loads during normal switching,
when the FB pin is above the 750mV reference, the DL
output is high and the low-side MOSFET is on. During this
time, the voltage across the inductor is approximately
-V
OUT
. This causes a down-slope or falling di/dt in the
inductor. If the load di/dt is not much faster than the
-di/dt in the inductor, then the inductor current will tend
to track the falling load current. This will reduce the excess
inductive energy that must be absorbed by the output
capacitor, therefore a smaller capacitance can be used.
The following can be used to calculate the needed capaci-
tance for a given dI
LOAD
/dt.
Peak inductor current is shown by the next equation.
   I
LPK
 = I
MAX
 + 1/2 x I
RIPPLEMAX
   I
LPK
 = 6 + 1/2 x 3.7 = 7.9A
dt
dl
Current
Load
of
change
of
Rate
LOAD
   I
MAX
 = maximum load release = 6A
OUT
PK
LOAD
MAX
OUT
LPK
LPK
OUT
V
V
2
dt
dl
I
V
I
L
I
C
Example
s
1
A
2
dt
dl
LOAD
This would cause the output current to move from 6A to
0A in 3.0祍, giving the minimum output capacitance
requirement shown in the following equation.
V
5
.
1
V
6
.
1
2
s
1
2
6
5
.
1
9
.
7
H
5
.
1
A
9
.
7
C
OUT
   C
OUT
 = 194 礔
Note that C
OUT
 is much smaller in this example, 194礔
compared to 298礔 based on a worst-case load release. To
meet the maximum design criteria of minimum 298礔
and maximum 16m& ESR, select one capacitor rated at
330礔 and 9m& ESR.
It is recommended that an additional small capacitor be
placed in parallel with C
OUT
 in order to filter high frequency
switching noise.
相關PDF資料
PDF描述
SC418ULTRT IC REG DL BUCK/LINEAR 20MLPQ
SC424MLTRT IC REG DL BUCK/LINEAR 28MLPQ
SC4250LISTRT IC HOT SWAP CTRLR 8-SOIC
SC427MLTRT IC REG DL BUCK/LINEAR 32MLPQ
SE95D,112 IC SENSOR TEMP 2.8-5.5V SOT96-1
相關代理商/技術參數
參數描述
SC4040 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PRECISION SHUNT VOLTAGE REFERENCE
SC4040AS 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PRECISION SHUNT VOLTAGE REFERENCE
SC4040ASK 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PRECISION SHUNT VOLTAGE REFERENCE
SC4040ASK.TR 制造商:Semtech Corporation 功能描述:IC V-REF PRECISION 2.5V 3SOT-23 T/R
SC4040AZ 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PRECISION SHUNT VOLTAGE REFERENCE
主站蜘蛛池模板: 通辽市| 武强县| 潜山县| 岳阳市| 英德市| 阿克陶县| 垦利县| 德庆县| 无为县| 英山县| 兴安县| 珠海市| 齐河县| 福鼎市| 湖南省| 平舆县| 敖汉旗| 北海市| 马边| 福鼎市| 秦安县| 榆树市| 临泽县| 伊通| 广昌县| 金昌市| 三门县| 页游| 绥滨县| 潍坊市| 新安县| 仲巴县| 怀来县| 绥中县| 讷河市| 客服| 阳春市| 嵩明县| 秦安县| 南乐县| 浦江县|