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參數(shù)資料
| 型號(hào)： | LTC1642C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 8-Bit, 40 MSPS ADC Single Ch., Internal S&H, Low Power 24-SO 0 to 70 |
| 中文描述： | 熱插拔控制器 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 147K |
| 代理商： | LTC1642C |
10
LTC 1642
APPLICATIO S U
U
Undervoltage Monitor
W
U
The LTC1642 will assert RESET if a monitored voltage falls
below a programmable minimum. When the monitored
voltage has exceeded its minimum for at least one system
timing cycle, RESET goes high. The monitoring circuitry
comprises an internal 1.23V bandgap reference, an inter-
nal precision voltage comparator and an external resistive
divider to monitor the output supply voltage. The circuit is
shown in Figure 12, and typical waveforms in Figure 13.
When the voltage at the FB pin rises above its reset
threshold (1.23V), the comparator output goes low and a
timing cycle starts (times 1 and 5). Following the cycle
RESET is pulled high.
At time 2 the voltage at FB drops below the comparator’s
threshold and RESET is pulled low. If the FB pin rises
above the reset threshold for less than a timing cycle the
RESET output will remain low (time 3 to time 4). The 15
μ
A
pull-up current source to V
CC
on RESET has a series diode
so the pin can be pulled above V
CC
by an external pull-up
resistor without forcing current back into the supply.
Reference
The LTC1642’s internal voltage reference is buffered and
brought out to the REF pin. The buffer amplifier should be
compensated with a capacitor connected between REF
and ground. If no DC current is drawn from REF, 0.1
μ
F
ensures an adequate phase margin, but the minimum
compensation increases if REF sources a substantial DC
current, as shown in Figure 14.
Uncommitted Comparator
The uncommitted comparator has an open drain output.
The comparator has 3mV of hysteresis: the output goes
high when the differential input voltage exceeds 1.5mV
and goes low when the differential input is less than
–1.5mV.
GATE
ON
14
SENSE
15
FB
7
RESET
5
4
V
CC
16
R2
0.010
Q1
FDR9410A
GND
LTC1642
8
RST TMR
3
1642 F12
R3
100
R4
330
C2
0.047
μ
F
R7
95.3k
1%
R6
12.4k
1%
+
C1
0.33
μ
F
ALL RESISTORS
±
5% UNLESS NOTED.
FB COMPARATOR TRIPS AT V
OUT
= 10.7V
Figure 12. Undervoltage Monitoring Circuitry
V
IN
12V
2.5A
V
OUT
C
LOAD
1642 F13
V
OUT
RST TMR
V1
V2
V2
V1
5
4
3
2
1
RESET
V1
Figure 13. Supply Monitor Waveforms
REFERENCE CURRENT
100
μ
A
1mA
10mA
M
μ
F
1642 F14
0.1
0.2
0.4
1.0
2.0
4.0
10.0
Figure 14. Minimum REF Compensation vs REF Current
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| 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(pán) 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(pán) 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(pán) 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF) |
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