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參數(shù)資料
| 型號： | LT4256-3CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Positive High Voltage Hot Swap Controller with Open-Circuit Detect |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 305K |
| 代理商： | LT4256-3CGN |
LT4256-3
10
42563f
APPLICATIU
Hot Circuit Insertion
When circuit boards are inserted into a live backplane, the
supply bypass capacitors on the boards draw high peak
currents from the backplane power bus as they charge.
The transient currents can permanently damage the con-
nector pins and glitch the system supply, causing other
boards in the system to reset.
The LT4256-3 is designed to turn on a board’s supply
voltage in a controlled manner, allowing the board to be
safely inserted or removed from a live backplane. The
device also provides undervoltage and overvoltage as well
as overcurrent protection while a power good output
signal indicates when the output supply voltage is ready
with a high output.
W
U
U
Power-Up Sequence
An external N-channel MOSFET pass transistor (Q1) is
placed in the power path to control the power up of the
supply voltage (Figure 5). Resistor R5 provides current
detection and capacitor C1 controls the GATE slew rate.
Resistor R7 compensates the current control loop while
R6 prevents high frequency oscillations in Q1.
When the power pins first make contact, transistor Q1 is
held off. If the voltage on V
CC
is between the externally
programmed undervoltage and overvoltage thresholds,
V
CC
is above 9.8V and the voltage on TIMER is less than
4.65V (typ), transistor Q1 will be turned on (Figure 6). The
voltage on GATE rises with a slope equal to 30
μ
A/C1 and
the supply inrush current is set at:
I
INRUSH
= C
L
30
μ
A/C1
where C
L
is the total load capacitance.
(1)
Figure 5. 1.6A, 48V Latchoff Application
Figure 6. Start-Up Waveforms
4256 F05
R5
0.025
LT4256-3
SENSE
13
12
10
5
7
8
16
15
1
2
4
9
V
CC
GATE
V
OUT
FB
PWRGD
GND
RETRY
UV
OV
TIMER
V
IN
48V
GND
(SHORT PIN)
Q1
IRF530
D1
CMPZ5241BS
11V
R3
4.02k
R2
4.02k
R1
64.9k
R7
100
C1
10nF
R9
4.02k
R6
10
R8
36.5k
PWRGD
V
48V
1.6A
R4
51k
C
L
C2
33nF
C3
0.01
μ
F
OPEN
UV = 36V
OV = 73V
PWRGD = 40V
D2
SMAT70A
+
I
OUT
500mA/DIV
V
50V/DIV
5ms/DIV
4256 F06
PWRGD
50V/DIV
GATE
50V/DIV
相關(guān)PDF資料 |
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| LT4256-3IGN | Positive High Voltage Hot Swap Controller with Open-Circuit Detect |
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| LT4351IMS | MOSFET Diode-OR Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT4256-3CGN#PBF | 功能描述:IC CTRLR HOTSWP HV DETECT 16SSOP 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) |
| LT4256-3CGN#TR | 功能描述:IC CTRLR HOTSWP HV DETECT 16SSOP 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(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 |
| LT4256-3CGN#TRPBF | 功能描述:IC CTRLR HOTSWP HV DETECT 16SSOP 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 |
| LT4256-3IGN | 功能描述:IC CTRLR HOTSWP HV DETECT 16SSOP 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(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 |
| LT4256-3IGN#PBF | 功能描述:IC CTLR HOTSWP HV DETECT 16SSOP 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) |
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