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參數(shù)資料
| 型號(hào)： | LT1640HCS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 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(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 292K |
| 代理商： | LT1640HCS8 |
10
LT1640L/LT1640H
APPLICATIO
S I
N
FOR
ATIO
U
supply input. The UV and OV pins are internally connected
to analog comparators with 20mV of hysteresis. When the
UV pin falls below its threshold or the OV pin rises above
its threshold, the GATE pin is immediately pulled low. The
GATE pin will be held low until UV is high and OV is low.
The undervoltage and overvoltage trip voltages can be
programmed using a three resistor divider as shown in
Figure 10a. With R4 = 562k, R5 = 9.09k and R6 = 10K, the
undervoltage threshold is set to 37V and the overvoltage
threshold is set to 71V. The resistor divider will also gain
up the 20mV hysteresis at the UV pin and OV pin to 0.6V
and 1.2V at the input respectively.
More hysteresis can be added to the UV threshold by
connecting resistor R3 between the UV pin and the GATE
pin as shown in Figure 10b.
The new threshold voltage when the input moves from low
to high is:
W
U
V
V
R
R
R
R
R
R
R
R
UV LH
,
UVH
=
+
+
2
3
1
2
3
3
1
2
where V
UVH
is typically 1.243V.
The new threshold voltage when the input moves from
high to low is:
V
V
R
R
R
R
R
R
R
R
V
R
R
UV HL
,
UVL
GATE
–
=
+
+
2
3
1
2
3
3
1
2
1
3
where V
UVL
is typically 1.223V.
The new hysteresis value will be:
V
V
R
R
R
R
R
R
R
R
V
R
R
HYS
UVHY
GATE
=
+
+
+
2
3
1
2
3
3
1
2
1
3
With R1 = 562k, R2 = 16.9k and R3 = 1.62M, V
GATE
=
135mV and V
UVHY
= 20mV, the undervoltage threshold
will be 43V (from low to high) and 37.6V (from high to
low). The hysteresis is 5.4V. A separate resistor divider
should be used to set the overvoltage threshold given by:
V
V
R
R
R
OV
OVH
=
+
4
5
5
With R4 = 506k, R5 = 8.87k and V
OVH
= 1.223V, the
overvoltage threshold will be 71V.
Figure 10a. Undervoltage and Overvoltage Sensing
V
EE
V
DD
LT1640L
LT1640H
R4
R5
R6
4
1640 F10a
OV
GND
3
2
–48V
UV
8
V
UV
= 1.223RR5 + R6
(
(
)
)
V
OV
= 1.223R4 + R5+ R6
R6
PWRGD/PWRGD Output
The PWRGD/PWRGD output can be used to directly en-
able a power module when the input voltage to the module
is within tolerance. The LT1640L has a PWRGD output for
modules with an active low enable input, and the LT1640H
has a PWRGD output for modules with an active high
enable input.
When the DRAIN voltage of the LT1640H is high with
respect to V
EE
(Figure 11), the internal transistor Q3 is
turned off and R7 and Q2 clamp the PWRGD pin one diode
drop (
≈
0.7V) above the DRAIN pin. Transistor Q2 sinks
the module’s pull-up current and the module turns off.
When the DRAIN voltage drops below V
PG
, Q3 will turn on,
shorting the bottom of R7 to V
EE
and turning Q2 off. The
V
EE
V
DD
LT1640L/LT1640H
SENSE
C1
0.033
μ
F
24V
Q1
IRF530
R6
10
5%
R1
562k
1%
R3
1.62M
1%
R2
16.9k
1%
R4
506k
1%
R5
8.87k
1%
R1
0.02
5%
4
2
3
UV
UV
OV
= 37.6V
= 43V
= 71V
GND
–48V
UV
OV
5
6
8
GATE
1640 F10b
Figure 10b. Programmable Hysteresis
for Undervoltage Detection
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1640HCS8#PBF | 功能描述:IC CONTRLR HOTSWAP NEGVOLT 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)關(guān):無(wú) 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(lèi)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 |
| LT1640HCS8#TR | 功能描述:IC CTRLR HOTSWAP NEG VOLT 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)關(guān):無(wú) 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(lèi)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 |
| LT1640HCS8#TRPBF | 功能描述:IC CONTRLR HOTSWAP NEGVOLT 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)關(guān):無(wú) 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(lèi)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 |
| LT1640HCS8TR | 制造商:LINEAR TEC 功能描述:NEW |
| LT1640HIN8 | 功能描述:IC CONTRLR HOTSWAP NEGVOLT 8-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)關(guān):無(wú) 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(lèi)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 |
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