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參數(shù)資料
| 型號(hào)： | LT1640LIS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Negative Voltage Hot Swap Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 292K |
| 代理商： | LT1640LIS8 |
8
LT1640L/LT1640H
APPLICATIO
S I
N
FOR
ATIO
U
The waveforms are shown in Figure 6b. When the power
pins make contact, they bounce several times. While the
contacts are bouncing, the LT1640 senses an undervoltage
condition and the GATE is immediately pulled low when
the power pins are disconnected.
Once the power pins stop bouncing, the GATE pin starts to
ramp up. When Q1 turns on, the GATE voltage is held
constant by the feedback network of R3 and C2. When the
DRAIN voltage has finished ramping, the GATE pin then
ramps to its final value.
W
U
Electronic Circuit Breaker
The LT1640 features an electronic circuit breaker function
that protects against short circuits or excessive supply
currents. By placing a sense resistor between the V
EE
and
SENSE pin, the circuit breaker will be tripped whenever the
voltage across the sense resistor is greater than 50mV for
more than 3
μ
s as shown in Figure 7.
GATE pin will remain low until the circuit breaker is reset
by pulling UV low, then high or cycling power to the part.
If more than 3
μ
s deglitching time is needed to reject
current noise, an external resistor and capacitor can be
added to the sense circuit as shown in Figure 8. R7 and C3
act as a lowpass filter that will slow down the SENSE pin
voltage from rising too fast. Since the SENSE pin will
source current, typically 20
μ
A, there will be a voltage drop
on R7. This voltage will be counted into the circuit breaker
trip voltage just as the voltage across the sense resistor.
A small resistor is recommended for R7. A 100
for R7
will cause a 2mV error. The following equation can be used
to estimate the delay time at the SENSE pin:
t
–R C In
V( )– ( )
V
V t
V t
– ( )
O
i
=
–
1
Where V(t) is the circuit breaker trip voltage, typically
50mV. V(t
O
) is the voltage drop across the sense resistor
before the short or over current condition occurs. V
i
is the
voltage across the sense resistor when the short current
or over current is applied on it.
Example: A system has a 1A current load and a 0.02
sense resistor is used. An extended delay circuit needs to
be designed for a 50
μ
s delay time after the load jumps to
5A. In this case:
V(t) = 50mV
V(t
O
) = 20mV
V
i
= 5A 0.02
= 100mV
If we choose R = 100
, we will get C = 1
μ
F.
V
EE
V
DD
LT1640L/LT1640H
PWRGD/
PWRGD
SENSE
C1
0.033
μ
F
24V
C
L
100
μ
F
100V
Q1
R2
10
5%
R3
10k
5%
C2
3.3nF
100V
R4
562k
1%
R5
9.09k
1%
R6
10k
1%
R1
0.02
5%
4
3
2
OV = 71V
GND
–48V
UV = 37V
OV
UV
5
R7
C3
6
8
7
1
GATE
DRAIN
1640 F08
+
Figure 8. Extending the Short-Circuit Protection Delay
Note that the circuit breaker threshold should be set
sufficiently high to account for the sum of the load current
and the inrush current. If the load current can be controlled
by the PWRGD/PWRGD pin (as in Figure 6a), the threshold
can be set lower, since it will never need to accommodate
inrush current and load current simultaneously.
When the circuit breaker trips, the GATE pin is immediately
pulled to V
EE
and the external N-channel turns off. The
1640 F07
Figure 7. Short-Circuit Protection Waveforms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1640LIS8#PBF | 功能描述:IC CONTRLR HOTSWAP NEGVOLT 8SOIC 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) |
| LT1640LIS8#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller IC |
| LT1640LIS8#TR | 功能描述:IC CTRLR HOTSWAP NEG VOLT 8SOIC 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 |
| LT1640LIS8#TRPBF | 功能描述:IC CONTRLR HOTSWAP NEGVOLT 8SOIC 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 |
| LT1641 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Positive High Voltage Hot Swap Controller |
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