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參數(shù)資料
| 型號(hào)： | LTC4261CUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: QFN; No of Pins: 24; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件頁(yè)數(shù)： | 11/34頁(yè) |
| 文件大?。?/td> | 357K |
| 代理商： | LTC4261CUFD#TRPBF |
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LTC4261/LTC4261-2
19
42612fc
overvoltage auto-retry has been disabled by clearing reg-
ister bit D0.
Undervoltage Comparator and Undervoltage Fault
The LTC4261/LTC4261-2 provide two undervoltage pins,
UVH and UVL, for adjustable UV threshold and hyster-
esis. The UVH and UVL pins have the following accurate
thresholds:
For UVH rising, VUVH(TH) = 2.56V, turn on
For UVL falling, VUVL(TH) = 2.291V, turn off
Both UVH and UVL pins have a minimum hysteresis of
dVUV (15mV typical). In either a rising or a falling input
supply, the undervoltage comparator works in such a way
that both the UVH and the UVL pins have to cross their
thresholds for the comparator output to change state.
The UVH, UVL, and OV threshold ratio is designed to
match the standard telecom operating range of 43V to
71V and UV hysteresis of 4.5V when UVH and UVL are
tied together as in Figure 1, where the built-in UV hyster-
esis referred to the UVL pin is:
DVUV(HYST) = VUVH(TH) – VUVL(TH) = 0.269V
Using R1 = 11.8k, R2 = 16.9k and R3 = 453k as in Figure 1
gives a typical operating range of 43.0V to 70.7V, with
an undervoltage shutdown threshold of 38.5V and an
overvoltage shutdown threshold of 72.3V.
The UV hysteresis can be adjusted by separating the
UVH and the UVL pins with a resistor RH (Figure 8). To
increase the UV hysteresis, the UVL tap should be placed
above the UVH tap as in Figure 7a. To reduce the UV hys-
teresis, place the UVL tap under the UVH tap as in Figure
7b. UV hysteresis referred to the UVL pin is given by:
for VUVL ≥ VUVH,
DVUVL(HYST) = DVUV(HYST) + 2.56V
RH
R1
+ R2
or for VUVL < VUVH,
DVUVL(HYST) = DVUV(HYST) – 2.56V
RH
R1
+ R2 + RH
For VUVL < VUVH, the minimum UV hysteresis allowed is
the minimum hysteresis at UVH and UVL:
dVUV = 15mV
when RH(MAX) = 0.11 (R1 + R2)
The design of the LTC4261/LTC4261-2 protects the UV
comparator from chattering even when RH is larger than
RH(MAX).
An undervoltage fault occurs when the UVL pin falls
below 2.291V and the UVH pin falls below 2.56V –
dVUV.
This activates the FET turn-off and sets the undervoltage
Figure 7. –36V to –72V Step Response
APPLICATIONS INFORMATION
RTN – VEE
TMR
SS
GATE
VOUT
SENSE
PG
PGIO
36V
0V
2.56V
VGATEH
LOAD
0V
42612 F07
50mV
LOAD + INRUSH
FET VTH
72V
相關(guān)PDF資料 |
PDF描述 |
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| LTC4261CUFD-2#PBF | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: QFN; No of Pins: 24; Temperature Range: 0°C to +70°C |
| LTC4261CUFD-2#TRPBF | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: QFN; No of Pins: 24; Temperature Range: 0°C to +70°C |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4261IGN | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP RoHS:否 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(yè)面:1423 (CN2011-ZH PDF) |
| LTC4261IGN#PBF | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP 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(yè)面:1423 (CN2011-ZH PDF) |
| LTC4261IGN#TR | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP RoHS:否 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(yè)面:1423 (CN2011-ZH PDF) |
| LTC4261IGN#TRPBF | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP 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(yè)面:1423 (CN2011-ZH PDF) |
| LTC4261IGN-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring |
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