參數(shù)資料
型號: LTC4211IMS8
廠商: Linear Technology
文件頁數(shù): 28/40頁
文件大?。?/td> 321K
描述: IC CONTROLLER HOT SWAP 8-MSOP
標(biāo)準包裝: 50
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開關(guān):
電源電壓: 2.5 V ~ 16.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 管件
LTC4211
28
4211fb
APPLICATIONS INFORMATION
1
V
CC
TIMER
GATE
RESET
V
CC
  V
SENSE
FILTER
V
OUT
2
3    5
6
7
4
B
8
SLOW COMPARATOR ARMED
FAST COMPARATOR ARMED
t
OFF
t
1
t
2
t
FILTER
t
OFF
V
REF
>50mV
GATE
V
FB
 < V
REF
V
OUT
FPD
t
RESET
V
SENSE
 = 50mV
REGULATED
LOAD CURRENT
10糀
4211 F19
2糀
ON/FAULT
ON/FAULT
DUTY CYCLE =
(t
FILTER
 << t
1
, t
2
 AND t
OFF
)
t
2
t
OFF
 + t
1
 + t
2
To increase the RC delay, the user may either increase
C
AUTO
 or R
AUTO
. However, increasing C
AUTO
 > 2糉 will
actually limit the RC delay due to the reset sink-current
capability of the FAULT pin. Therefore, in order to increase
the RC delay, it is more effective to either increase R
AUTO
 
or to put a bleed resistor in parallel with C
AUTO
 to GND.
For example, increasing R
AUTO
 in Figure 18 from 1M to
3.2M decreases the duty cycle to 0.8%.
HOT SWAPPING TWO SUPPLIES
Using two external pass transistors, the LTC4211 can
switch two supply voltages. In some cases, it is necessary
to bring up the dominant supply first during power-up but
ramp them down together during the power-down phase.
The circuit in Figure 20 shows how to program two dif-
ferent delays for the pass transistors. The 5V supply is
powered up first. R1 and C3 are used to set the rise and
fall times on the 5V supply. Next, the 3.3V supply ramps
up with 20ms delay set by R6 and C2. On the falling edge,
both supplies ramp down together because D1 and D2
bypass R1 and R6.
OVERVOLTAGE TRANSIENT PROTECTION
Good engineering practice calls for bypassing the supply
rail of any analog circuit. Bypass capacitors are often placed
at the supply connection of every active device, in addition
to one or more large value bulk bypass capacitors per sup-
ply rail. If power is connected abruptly, the large bypass
capacitors slow the rate of rise of the supply voltage and
heavily damp any parasitic resonance of lead or PC track
inductance working against the supply bypass capacitors.
The opposite is true for LTC4211 Hot Swap circuits mounted
on plug-in cards. In most cases, there is no supply bypass
capacitor present on the powered supply voltage side of
the MOSFET switch. An abrupt connection, produced by
Figure 19. Autoretry Timing
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LTC4211IMS8#PBF 功能描述:IC CONTROLLER HOT SWAP 8-MSOP 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)
LTC4211IMS8#TR 功能描述:IC CONTROLLER HOT SWAP 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(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
LTC4211IMS8#TRPBF 功能描述:IC CONTROLLER HOT SWAP 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(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
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