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參數(shù)資料
| 型號： | LTC4252-2CMS8#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: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大?。?/td> | 336K |
| 代理商： | LTC4252-2CMS8#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
26
425212fc
APPLICATIONS INFORMATION
CB FAULT
TIMER
GATE
SENSE
VOUT
SS
DRAIN
PWRGD
TIMER
GATE
SENSE
VOUT
SS
DRAIN
PWRGD
TIMER
GATE
SENSE
VOUT
SS
DRAIN
PWRGD
CB FAULT
5.8μA
12
425212 F14
12
CB TIMES OUT
14
3
2
CB TIMES OUT
VACL
VCB
VACL
VDRNCL
VCB
VACL
VTMRH
VCB
DRN
VDRNCL
DRN
(14a) Momentary Circuit-Breaker Fault
Figure 14. Circuit-Breaker Timing Behavior (All Waveforms Are Referenced to VEE)
(14b) Circuit-Breaker Time Out
(14c) Multiple Circuit-Breaker Fault
the VTMRH threshold, TIMER is discharged by 5.8μA. In
Figure 14b, when TIMER exceeds VTMRH, GATE pulls down
immediately and the LTC4252 shuts down. In Figure 14c,
multiple momentary faults cause the TIMER capacitor to
integrate and reach VTMRH. GATE pull down follows and
the LTC4252 shuts down. During shutdown, the LTC4252-1
latches TIMER high with a 5.8μA pull-up current source;
the LTC4252-2 activates a shutdown cooling cycle.
Resetting a Fault Latch (LTC4252-1)
The latched circuit breaker fault of LTC4252-1 benefits
from long cooling time. It is reset by pulling the UV pin
below VUVLO with a switch. Reset is also accomplished by
pulling the VIN pin momentarily below (VLKO – VLKH). A
third reset method involves pulling the TIMER pin below
VTMRL as shown in Figure 15. An initial timing cycle is
skipped if TIMER is used for reset. An initial timing cycle
is generated if reset by the UV pin or the VIN pin.
The duration of the TIMER reset pulse should be smaller
than the time taken to reach 0.2V at SS pin. With a single
pole mechanical pushbutton switch, this may not be
feasible. A double pole, single throw pushbutton switch
removes this restriction by connecting the second switch
to the SS pin. With this method, both the SS and TIMER
pins are released at the same time (see Figure 24).
Shutdown Cooling Cycle (LTC4252-2)
Figure 16 shows the timer behavior of the LTC4252-2. At
time point 2, TIMER exceeds VTMRH, GATE pulls down
immediately and the LTC4252 shuts down. TIMER starts
a shutdown cooling cycle by discharging TIMER with
5.8μA to the VTMRL threshold. TIMER then charges with
5.8μA to the VTMRH threshold. There are four 5.8μA
discharge phases and three 5.8μA charge phases in this
shutdown cooling cycle spanning time points 2 and 3. At
time point 3, the LTC4252 automatic retry occurs with a
start-up cycle. Good thermal management techniques are
highly recommended; power and thermal dissipation must
be carefully evaluated when implementing the automatic
retry scheme.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4252-2CMSPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-2CMSTR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-2CMSTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| 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:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內部開關:無 電流限制:可調 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） 供應商設備封裝: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:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內部開關:無 電流限制:可調 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） 供應商設備封裝:10-MSOP 包裝:管件 |
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