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參數(shù)資料
| 型號： | LTC4252-2CMS#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 8/36頁 |
| 文件大?。?/td> | 394K |
| 代理商： | LTC4252-2CMS#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
16
425212fb
Overvoltage conditions detected by the OV comparator
will also pull GATE low, thereby shutting down the load.
However, it will not reset the circuit breaker TIMER,
PWRGD flag or shutdown cooling timer. Returning the
supply voltage to an acceptable range restarts the GATE
pin if all the interlock conditions except TIMER are met.
Only during the initial timing cycle does an OV condition
reset the TIMER.
DRAIN
Connecting an external resistor, RD, to the dual function
DRAIN pin allows VOUT sensing* without it being damaged
by large voltage transients. Below 5V, negligible pin leak-
age allows a DRAIN low comparator to detect VOUT less
than 2.385V (VDRNL). This condition, together with the
GATE low comparator, sets the PWRGD flag.
If VOUT > VDRNCL, the DRAIN pin is clamped at about
VDRNCL and the current flowing in RD is given by:
I
VV
R
DRN
OUT
DRNCL
D
≈
(1)
This current is scaled up 8 times during a circuit breaker
fault and is added to the nominal 230
A TIMER current.
This accelerates the fault TIMER pull-up when the MOSFET’s
drain-source voltage exceeds VDRNCLandeffectivelyshort-
ens the MOSFET heating duration.
TIMER
The operation of the TIMER pin is somewhat complex as
it handles several key functions. A capacitor CT is used at
TIMER to provide timing for the LTC4252. Four different
charging and discharging modes are available at TIMER:
1) A 5.8
A slow charge; initial timing and shutdown
cooling delay.
2) A (230
A + 8 IDRN) fast charge; circuit breaker delay.
3) A 5.8
A slow discharge; circuit breaker "cool off" and
shutdown cooling.
4) Low impedance switch; resets the TIMER capacitor
after an initial timing delay, in UVLO, in UV and in OV
during initial timing.
For initial start-up, the 5.8
A pull-up is used. The low
impedance switch is turned off and the 5.8
A current
source is enabled when the interlock conditions are met.
CT charges to 4V in a time period given by:
t
VC
A
T
=
4
58
.
(2)
When CT reaches 4V (VTMRH), the low impedance switch
turns on and discharges CT. A GATE start-up cycle begins
and both SS and GATE are released.
CIRCUIT BREAKER TIMER OPERATION
If the SENSE pin detects more than a 50mV drop across
RS, the TIMER pin charges CT with (230A + 8 IDRN). If
CT chargesto4V,theGATEpinpullslowandtheLTC4252-1
latches off while the LTC4252-2 starts a shutdown cooling
cycle. The LTC4252-1 remains latched off until the UV pin
is momentarily pulsed low or TIMER is momentarily
discharged low by an external switch or VIN dips below
UVLO and is then restored. The circuit breaker timeout
period is given by:
t
VC
AI
T
DRN
=
+
4
230
8
(3)
If VOUT < 5V, an internal PMOS device isolates any DRAIN
pin leakage current, making IDRN = 0A in Equation (3). If
VOUT > VDRNCLduring the circuit breaker fault period, the
charging of CT accelerates by 8 IDRN of Equation (1).
Intermittent overloads may exceed the 50mV threshold at
SENSE, but, if their duration is sufficiently short, TIMER
will not reach 4V and the LTC4252 will not shut the external
MOSFET off. To handle this situation, the TIMER dis-
charges CT slowly with a 5.8A pull-down whenever the
SENSE voltage is less than 50mV. Therefore, any intermit-
tent overload with VOUT > 5V and an aggregate duty cycle
APPLICATIO S I FOR ATIO
WU
U
*VOUT as viewed by the MOSFET; i.e., VDS.
相關(guān)PDF資料 |
PDF描述 |
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| LTC4252-2IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252-2IMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-1CMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| LTC4252A-1CMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| LTC4252A-1IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
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| LTC4252-2IMS | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 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 |
| LTC4252-2IMS#PBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP 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 |
| LTC4252-2IMS#TR | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC4252-2IMS#TRPBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
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