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參數(shù)資料
| 型號： | LTC1645C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 8-Bit, 40 MSPS ADC Single Ch., Internal S&H, Low Power 24-TSSOP -40 to 85 |
| 中文描述： | 雙通道熱插拔控制器/電源序列 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 312K |
| 代理商： | LTC1645C |
8
LTC1645
Power Supply Ramping
The power supplies on a board are controlled by placing
external N-channel pass transistors in the power paths as
shown in Figure 2. Consult Table 1 for a selection of
N-channel FETs suitable for use with the LTC1645. R
SENSE1
and R
SENSE2
provide current fault detection and R1 and R2
prevent high frequency oscillation. By ramping the gates
of the pass transistors up and down at a controlled rate,
the transient surge current (I = C dv/dt) drawn from the
main backplane supply is limited to a safe value when the
board makes connection.
When power is first applied to the chip, the gates of the
N-channels (GATE1 and GATE2 pins) are pulled low. After
the ON pin is held above 0.8V for at least one timing cycle,
the voltage at GATE1 begins to rise with a slope equal to
dv/dt = 10
μ
A/C1 (Figure 3), where C1 is the external
capacitor connected between the GATE1 pin and GND. If
the ON pin is brought above 2V (and the ON pin has been
held above 0.8V for at least one timing cycle), the voltage
at GATE2 begins to rise with a slope equal to dv/dt =
10
μ
A/C2.
The ramp time for each supply is t = (V
CCn
Cn)/10
μ
A. If
the ON pin is pulled below 2V for GATE2 or 0.8V for GATE1
(but above 0.4V), a 40
μ
A current source is connected from
GATEnto GND, and the voltage at the GATEnpin will ramp
down, as shown in Figure 4.
Ringing
Good engineering practice calls for bypassing the supply
rail of any circuit. Bypass capacitors are often placed at the
supply connection of every active device, in addition to one
or more large value bulk bypass capacitors per supply rail.
If power is connected abruptly, the bypass capacitors slow
the rate of rise of voltage and heavily damp any parasitic
resonance of lead or trace inductance working against the
supply bypass capacitors.
The opposite is true for LTC1645 Hot Swap circuits on a
daughterboard. In most cases, on the powered side of the
N-channel FET switches (V
CCn
) there is no supply bypass
capacitor present. An abrupt connection, produced by
plugging a board into a backplane connector, results in a
fast rising edge applied to the V
CCn
line of the LTC1645.
APPLICATIOU
W
U
U
Figure 4. Supply Turning Off
Figure 3. Supply Turning On
Figure 2. Typical Hot Swap Connection
R
SENSE2
Q1
Q2
R2
10
C2
C
TIMER
C
LOAD1
C
LOAD2
R1
10
C1
12
1
2
3
8
9
6
5
11
7
13
14
10
4
V
CC1
ON
FAULT
SENSE1
GATE2
COMP
+
V
CC2
V
CC2
V
CC1
V
OUT2
V
OUT1
LTC1645
(14-LEAD)
TIMER
GND
COMPOUT
FB
SENSE2
GATE1
1645 F02
RESET
+
+
R
SENSE1
V
CCn
V
OUTn
V
CCn
+
V
GATE
1645 F03
t
1
t
2
GATEn
SLOPE = 10
μ
A/C
n
V
CCn
V
OUTn
V
CCn
+
V
GATE
1645 F04
t
3
t
4
GATEn
SLOPE = 40
μ
A/C
n
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相關代理商/技術參數(shù) |
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| LTC1645CS | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1645CS#PBF | 功能描述:IC CTLR HOT SWAP SEQ DUAL 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關:無 電流限制:可調 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） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC1645CS#TR | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1645CS#TRPBF | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1645CS8 | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
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