- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44996 > LTC4215IUFD-2#TR (LINEAR TECHNOLOGY CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 PDF資料下載
參數(shù)資料
| 型號： | LTC4215IUFD-2#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封裝： | 4 X 5 MM, PLASTIC, MO-220, QFN-24 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LTC4215IUFD-2#TR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當(dāng)前第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頁第26頁第27頁第28頁
LTC4215/LTC4215-2
17
4215fe
APPLICATIONS INFORMATION
pin low. The undervoltage lockout circuit has a 2μs lter
time after VDD drops below 2.74V. The UV pin reacts in
2μs to shut the GATE off, but it is recommended to add a
lter capacitor CF to prevent unwanted shutdown caused
by a transient. Eventually either the UV pin or undervoltage
lockout responds to bring the current under control before
the supply completely collapses.
Supply Transient Protection
The LTC4215 is safe from damage with supply voltages up
to 24V. However, spikes above 24V may damage the part.
During a short-circuit condition, large changes in current
owing through power supply traces may cause inductive
voltage spikes which exceed 24V. To minimize such spikes,
the power trace inductance should be minimized by using
wider traces or heavier trace plating. Also, a snubber circuit
dampens inductive voltage spikes. Build a snubber by using
a 100
Ω resistor in series with a 0.1μF capacitor between
VDD and GND. A surge suppressor, Z1 in Figure 1, at the
input can also prevent damage from voltage surges.
Design Example
As a design example, take the following specications:
VIN = 12V, IMAX = 5A, IINRUSH = 1A, dI/dtINRUSH = 10A/ms,
CL = 330μF, VUV(ON) = 10.75V, VOV(OFF) = 14.0V, VPWRGD(UP)
= 11.6V, and I2C ADDRESS = 1010011. This completed
design is shown in Figure 1.
Selection of the sense resistor, RS, is set by the overcurrent
threshold of 25mV:
R
mV
I
S
MAX
==
25
0 005
.
Ω
The MOSFET is sized to handle the power dissipation dur-
ing inrush when output capacitor COUT is being charged.
A method to determine power dissipation during inrush
is based on the principle that:
Energy in CL = Energy in Q1
This uses:
Energy in CL ==
()( )
1
2
1
2
033
12
2
CV
mF
.
or 0.024 joules. Calculate the time it takes to charge up
COUT:
tC
V
I
mF
V
A
ms
STARTUP
L
DD
INRUSH
==
=
.
033
12
1
4
The power dissipated in the MOSFET:
P
t
W
DISS
STARTUP
==
Energy in CL
6
TheSOA(safeoperatingarea)curvesofcandidateMOSFETs
must be evaluated to ensure that the heat capacity of the
package tolerates 6W for 4ms. The SOA curves of the
Fairchild FDC653N provide for 2A at 12V (24W) for 10ms,
satisfying this requirement. Since the FDC653N has less
than 8μF of gate capacitance and we are using a GATE
RC network, the short circuit stability of the current limit
should be checked and improved by adding a capacitor
from GATE to SOURCE if needed.
The inrush current is set to 1A using C1:
CC
I
CmF
μA
A
or C
L
GATE
INRUSH
1
10 33
20
1
16
=
==
.
.8
8nF
The inrush dI/dt is set to 10A/ms using CSS:
C
I
dI dt
A
s
R
μA
SS
SENSE
=
=
/
.
0 0375
1
10
1000
00
0 0375
1
5
75
.
.
m
nF
Ω
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4215IUFD-2#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215CUFD-2#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215IUFD-2 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215IUFD-3#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215CUFD-3#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4215IUFD-3#PBF | 功能描述:IC CTRLR HOT SWAP 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4215IUFD-3#TRPBF | 功能描述:IC CTRLR HOT SWAP 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4216 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Hot Swap Controller |
| LTC4216CDE | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 6V 12-Pin DFN EP |
| LTC4216CDE#PBF | 功能描述:IC CTLR HOT SWAP 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。