參數(shù)資料
型號: LTC1644
廠商: Linear Technology Corporation
元件分類: 基準電壓源/電流源
英文描述: CompactPCI Bus Hot Swap Controller
中文描述: CompactPCI總線熱插拔控制器
文件頁數(shù): 13/24頁
文件大小: 452K
代理商: LTC1644
LTC1644
13
1644f
APPLICATIU
W
U
U
Figure 3. Normal Power-Down Sequence
Figure 2. Normal Power-Up Sequence
TIMER
During a power-up sequence, a 21
μ
A current source is
connected to the TIMER pin (Pin 4) and current limit faults
are ignored until the voltage ramps to within 1V of 12V
IN
(Pin 1). This feature allows the chip to power up CPCI
boards with widely varying capacitive loads on the sup-
plies. The power-up time for any one of the four outputs is
given by Equation 2:
t
XV
C
XV
I
I
ON
OUT
LOAD XVOUT
(
OUT
LIMIT XVOUT
(
LOAD XVOUT
(
(
)
=
2
)
)
)
(2)
where XV
OUT
= 5V
OUT
, 3V
OUT
, 12V
OUT
or V
EEOUT
(–12V).
For example, for C
LOAD(5VOUT)
= 2000
μ
F, I
LIMIT(5VOUT)
=
7A and I
LOAD(5VOUT)
= 5A, the 5V
OUT
turn-on time will be
~10ms. By substituting the variables in Equation 2 with the
appropriate values, the turn-on time for the other three
outputs can be calculated.
The timer period should be set longer than the maximum
supply turn-on time but short enough to not exceed the
maximum safe operating area of the pass transistor during
a short circuit. The timer period for the LTC1644 is given
by:
t
C
V
A
TIMER
TIMER
21
=
μ
11
(3)
As a design aid, the timer period as a function of the timing
capacitor using standard values from 0.01
μ
F to 1
μ
F is
shown in Table 2.
TIMER
10V/DIV
GATE
5V/DIV
12V
10V/DIV
5V
10V/DIV
3V
10V/DIV
V
10V/DIV
LOCAL_PCI_RST#
5V/DIV
BD_SEL#
5V/DIV
HEALTHY#
5V/DIV
PRECHARGE
5V/DIV
10ms/DIV
1644 F02
TIMER
10V/DIV
GATE
5V/DIV
12V
10V/DIV
5V
10V/DIV
3V
10V/DIV
V
10V/DIV
LOCAL_PCI_RST#
5V/DIV
BD_SEL#
5V/DIV
HEALTHY#
5V/DIV
PRECHARGE
5V/DIV
10ms/DIV
1644 F03
相關(guān)PDF資料
PDF描述
LTC1644CGN 8-Bit, 40 MSPS ADC Single Ch., Internal S&H, Low Power 24-TSSOP -40 to 85
LTC1647-3CGN Dual Hot Swap Controllers
LTC1647-3IGN Dual Hot Swap Controllers
LTC1647 Low Power Timer 8-SO 0 to 70
LTC1647-1 Dual Hot Swap Controllers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1644CGN 功能描述:IC CONTROLLER HOT SWAP 20-SSOP 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(guān) 應用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 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
LTC1644CGN#PBF 功能描述:IC CONTROLLER HOT SWAP 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用: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 供應商設備封裝:80-TQFP(12x12) 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF)
LTC1644CGN#TR 功能描述:IC CONTROLLER HOT SWAP 20-SSOP 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(guān) 應用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 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
LTC1644CGN#TRPBF 功能描述:IC CONTROLLER HOT SWAP 20-SSOP 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(guān) 應用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 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
LTC1644IGN 功能描述:IC CONTROLLER HOT SWAP 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用: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 供應商設備封裝:80-TQFP(12x12) 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF)