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參數(shù)資料
| 型號(hào)： | LTC1642CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Hot Swap Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 147K |
| 代理商： | LTC1642CGN |
8
LTC 1642
Overvoltage Protection
The LTC1642 can protect a load from overvoltages by
turning off the pass transistor if the supply voltage ex-
ceeds a programmable limit, and by triggering a crowbar
SCR if the overvoltage lasts longer than a programmable
time. The part can also be configured to automatically
restart when the overvoltage clears.
The overvoltage protection circuitry is shown in Figure 8.
The external components comprise a resistor divider
driving the OV pin, timing capacitor C5, NPN emitter
follower Q2, and crowbar SCR Q3. Because the MCR12DC
is not a sensitive-gate device, the optional resistor shunt-
ing the SCR gate to ground is omitted. The internal
components comprise a comparator, 1.23V bandgap ref-
erence, two current sources, and a timer at the CRWBR
pin. When V
CC
exceeds (1+R1/R5)1.23V the comparator’s
output is high and internal logic pulls the GATE down and
starts the timer. This timer has a 0.410V threshold and
uses the CRWBR pin; when CRWBR reaches 0.410V the
timer comparator trips, and the current sourced from V
CC
increases to 1.5mA. Emitter follower Q2 boosts this cur-
rent to trigger crowbar SCR Q3. The ramp time
t needed
to trip the comparator is :
t(ms) = 9.1C5(
μ
F).
Once the CRWBR timer trips the LTC1642 latches off: after
the overvoltage clears GATE and FAULT remain at ground
and CRWBR continues sourcing 1.5mA. To restart the part
after the overvoltage clears, hold the ON pin low for at least
2
μ
s and then bring it high. The GATE voltage will begin
ramping up one system timing cycle later. The part will
restart itself if FAULT and ON are connected: GATE begins
ramping up one system timing cycle after the overvoltage
clears.
Figure 9 shows typical waveforms when the divider is
driven from V
CC
. The OV comparator goes high at time 1,
causing the chip to pull the GATE pin to ground and start
the CRWBR timer. At time 2, before the timer’s compara-
tor trips, OV falls below its threshold; the timer resets and
GATE begins charging one system timing cycle later at
time 3. Another overvoltage begins at time 4, and at time
5 the CRWBR timer trips; FAULT goes low and the CRWBR
pin begins sourcing 1.5mA. Even after OV falls below
1.23V at time 6, GATE and FAULT stay low, and CRWBR
continues to source 1.5mA. FAULT goes high when ON
GATE
ON
14
SENSE
15
CRWBR
1
4
FAULT
6
OV
9
V
CC
16
R2
0.010
Q1
FDR9410A
GND
LTC1642
8
RST TMR
3
R1
127k
1%
R5
12.4k
1%
V
IN
12V
2.5A
1642 F08
R3
100
R4
330
C2
0.047
μ
F
+
C7
0.1
μ
F
C1
0.33
μ
F
ALL RESISTORS
±
5% UNLESS NOTED
OV COMPARATOR TRIPS AT V
= 13.85V
RESET TIME = 200ms
CROWBAR DELAY TIME = 90
μ
s
Q2
2N2222
Q3
MCR12DC
C5
0.01
μ
F
V
OUT
C
LOAD
Figure 8. Overvoltage Protection Circuitry
1642 F09
1.23V
0.41V
V
CC
0V
0V
1.23V
GATE
0V
V
CC
V
OUT
OV
6 7
8
5
4
3
2
1
CRWBR
RST TMR
ON
FAULT
Figure 9. Overvoltage Timing (High Side)
APPLICATIO S U
U
W
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1642CGN#PBF | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP 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(kāi)關(guān):無(wú) 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) |
| LTC1642CGN#TR | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)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(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1642CGN#TRPBF | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)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(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1642IGN | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP 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(kāi)關(guān):無(wú) 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) |
| LTC1642IGN#PBF | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP 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(kāi)關(guān):無(wú) 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) |
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