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參數(shù)資料
| 型號(hào)： | 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)： | 11/20頁 |
| 文件大?。?/td> | 305K |
| 代理商： | LT4256-3CGN |
LT4256-3
11
42563f
APPLICATIU
To reduce inrush current, increase C1 or decrease load
capacitance. If the voltage across the current sense resis-
tor R5 reaches V
SENSETRIP
, the inrush current will be lim-
ited by the internal current limit circuitry. The voltage on
GATE is adjusted to maintain a constant voltage across the
sense resistor and TIMER begins to charge.
When the FB voltage goes above the low-to-high V
FB
threshold, PWRGD goes high.
W
U
U
Undervoltage and Overvoltage Detection
The LT4256-3 uses UV and OV to monitor the V
CC
voltage
to determine when it is safe to turn on the load and allow
the user the greatest flexibility for setting the operational
thresholds. UV and OV are internally connected to an
analog window comparator. Any time that UV goes below
3.6V or OV goes above 4V, GATE will be pulled low until the
UV/OV voltages return to the normal operation voltage
window (4V and 3.6V, respectively).
The UV threshold should never be set below the internal
UVLO threshold (9.8V typically) because the benefit of the
UV’s hysteresis will be lost, making the LT4256-3 more
susceptible to noise (V
CC
must be at least 9.8V when UV
is at its 3.6V threshold). UV is filtered with C3 to prevent
noise spikes and capacitively coupled glitches from shut-
ting down the LT4256-3 output erroneously.
To calculate UV and OV thresholds, use the following
equations:
4256 F07
R5
0.010
LT4256-3
SENSE
13
10
5
7
8
16
D2
SMAT70A
15
1
2
4
9
V
CC
GATE
FB
12
V
OUT
PWRGD
GND
RETRY
UV
OV
TIMER
V
CC
48V
(SHORT PIN)
Q1
IRF540
D1
CMPZ5241BS
11V
R3
4.02k
R2
4.02k
Q2
VN2222
R1
64.9k
R7
100
C1
10nF
R9
4.02k
R6
10
R8
36.5k
V
OUT
48V
4A
R4
51k
C
L
C2
33nF
C3
0.01
μ
F
OFF SIGNAL
FROM MPU
OPEN
UV = 36V
OV = 73V
PWRGD = 40V
GND
+
Figure 7. How to Use a Logic Signal to Control the LT4256-3 Turn On/Off
R
R
(
R
V
V
a
R
R
R
V
b
k
R
R
R
k
V
V
R
+
+
R
R
R
R
3
V
V
R
THUVLH
4
THOVLH
4
1
≤
THUVHL
THOVHL
1
2
3
1
2
3
1
2
1
2
20
2
3
200
1
3
3 6
.
1
2
1
3
2
4
3 6
.
1
=
+
)
( )
=
+
( )
+
+
≤
( )
( )
=
+
=
+
–
–
;
where V
THULH
and V
THOVLH
are the desired UV and OV
threshold voltages when V
CC
is rising (L – H).
Figure 7 shows how the LT4256-3 is commanded to shut
off with a logic signal. This is accomplished by pulling the
gate of the open-drain MOSFET, Q2, (tied to UV) high.
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| 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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