- 您現在的位置：買賣IC網 > Datasheet目錄42 > LTC4245CG#TRPBF (Linear Technology)IC CNTRLR HOT SWAP 36-SSOP Datasheet資料下載
參數資料
| 型號： | LTC4245CG#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 26/36頁 |
| 文件大小： | 431K |
| 描述： | IC CNTRLR HOT SWAP 36-SSOP |
| 標準包裝： | 1,000 |
| 類型： | 熱交換控制器 |
| 應用： | CompactPCI? |
| 內部開關： | 無 |
| 電源電壓： | 3.3V，5V，12V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 36-SSOP |
| 包裝： | 帶卷 (TR) |
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頁當前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁
LTC4245
26
4245fa
Table 2. Sense Resistance Values
SUPPLY
R
SENSE
(1%)
I
TRIP(MIN)
I
TRIP(MAX)
12V
50m?/DIV>
891mA
1.1A
5V
3.5m?/DIV>
6.4A
7.9A
3.3V
2.5m?/DIV>
8.9A
11.1A
12V
100m?/DIV>
396mA
606mA
If necessary, two resistors with the same tolerance can
be connected in parallel to yield the 3.5m?and 2.5m?
values.
2. Select the SS capacitor for limiting the rate of rise of
inrush current. Equations 1 and 2 lead to the following
design equation:
C
G I
R
dI dt
SS MIN
SS SS MAX
SENSE MIN
MA
( )
( )
( )
(
"
"( / )
e
XX)
(6)
Applying Equation 6 to the 12V supply, with G
SS
of 46mV/V,
I
SS(MAX)
of 24糀, R
SENSE(MIN)
of 49.5m? and (dI/dt)
(MAX)
of 150mA/ms yields a C
SS(MIN)
greater than 149nF. This
capacitance value satis es the dI/dt requirements of the
other supplies too. Hence, a 220nF (?0%) capacitor is
chosen for C
SS
.
3. To determine the TIMER capacitance, the time required
to completely power-up all supply outputs simultaneously
needs to be calculated. There are three parts to this time:
time for the internal current limit to cross zero (t
1
), time
for the gate to slew to the MOSFET threshold voltage (t
2
)
and the time for the current ow to charge up the load
capacitors (t
3
) (see Figure 17).
t
1
: The time for the internal current limit to rise above
zero is simply:
t
I
dI dt
FBL MIN
MIN
1
4
= "
( / )
( )
( )
(7)
t
2
: The maximum time for the gate of the external MOSFET to
rise to the threshold voltage depends on I
GATE(UP)(MIN)
and
the gate charge required to turn on the external MOSFET.
A typical value for this time is 1ms. This can be veri ed
after the MOSFETs are selected. Since the current limit
ramp is almost stopped while any MOSFET is turning on,
t
2
is 4 times 1ms or 4ms, since in the worst case none of
the four MOSFET turn-ons overlaps in time.
t
3
: Under simultaneous power-up each output voltage af-
fects the inrush current pro le. To simplify calculations, the
inrush current pro le shown in Figure 17 is chosen. All the
current is assumed to charge the load capacitor, i.e., there
is no load current. There are four parts to t
3
as shown.
Equations 8 to 11 are used to determine t
31
to t
34
:
t
I
dI dt
FBL MIN
MIN
31
=
( )
( )
( / )
(8)
t
C V
I
t
L FB
FBL MIN
32
31
0 5
=
"
. "
( )
(9)
t
I
I
dI dt
C
FBH MIN FBL MIN
MIN
L
33
2
=min
( / )
,
"
( )
( )
( )
""(
)
( / )
( )
V
V
dI dt
t
t
OUT FB
MIN
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
2
31
31
煙
?/DIV>
?/DIV>
?/DIV>
(10)
t
C V
V
t
I
I
L
OUT FB
FBL MIN
34
33
0
0 5
=
+
max
,
"(
) . "
"(
( )
FFBH MIN
FBH MIN
I
( )
( )
)
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
主站蜘蛛池模板：
平顶山市|
灌南县|
镇远县|
沈阳市|
太康县|
兴隆县|
河间市|
张家界市|
资兴市|
油尖旺区|
沈阳市|
成安县|
新河县|
房产|
和林格尔县|
天祝|
永顺县|
金湖县|
大冶市|
巨鹿县|
阿荣旗|
基隆市|
徐州市|
哈巴河县|
海盐县|
泰宁县|
福泉市|
晋宁县|
互助|
曲松县|
吉林省|
班戈县|
赞皇县|
钟山县|
奇台县|
额尔古纳市|
松溪县|
灌云县|
万载县|
广安市|
兴宁市|
?/DIV>
?/DIV>
?/DIV>
?/DIV>
(11)
APPLICATIO S I FOR ATIO
U
U
U
t
1
t
31
V
GATE
= 0
V
GATE
= V
TH
I
NEG
0
I
FBL
I
FBH
V
OUT
= V
FB
V
OUT
= V
IN
(SMALL C
L
)
V
OUT
= V
IN
(LARGE C
L
)
t
32
t
33
t
33
t
34
OR
t
2
4245 F17
INTERNAL CURRENT LIMIT
INRUSH CURRENT FOR LARGER C
L
INRUSH CURRENT FOR SMALLER C
L
Figure 17. Inrush Current Pro le for Design Example
相關PDF資料 |
PDF描述 |
|---|---|
| LTC4251-2CS6#TRPBF | IC CTRLR HOTSWAP NEGVOLT SOT23-6 |
| LTC4252A-1IMS#TRPBF | IC CNTRLR HOTSWAP NEGVOLT 10MSOP |
| LTC4253ACGN#TRPBF | IC HOT SWAP CONTRLR -48V 16-SSOP |
| LTC4257CS8 | IC CTRLR INTFACE PWR/ETHER 8SOIC |
| LTC4260IUH#PBF | IC HOT SWAP CNTRL I2C 32-QFN |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC4245CUHF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
| LTC4245CUHF#PBF | 功能描述:IC CNTRLR HOT SWAP 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內部開關:無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4245CUHF#TRPBF | 功能描述:IC CNTRLR HOT SWAP 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內部開關:無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4245IG | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
| LTC4245IG#PBF | 功能描述:IC CNTRLR HOT SWAP 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內部開關:無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產品目錄頁面:1423 (CN2011-ZH PDF) |
發布緊急采購，3分鐘左右您將得到回復。