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參數(shù)資料
| 型號： | LT1641IS8#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 192K |
| 描述： | IC CTRLR HOTSWAP POS VOLT 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 9 V ~ 80 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
7
LT1641
1641fd
ON
1641 F02
GATE
5V
t
PLHON
1.313V
1V
t
PHLON
1.233V
FB
1641 F03
PWRGD
1V
t
PLHFB
1.313V
1V
t
PHLFB
1.233V
V
CC
SENSE
1641 F04
GATE
V
CC
t
PHLSENSE
47mV
TI I G DIAGRA S U
W
Figure 2. ON to GATE Timing
Figure 3. FB to PWRGD Timing
Figure 4. SENSE to GATE Timing
APPLICATIO S I FOR ATIO
U
U
U
Hot Circuit Insertion
When circuit boards are inserted into a live backplane, the
supply bypass capacitors on the boards draw high peak
currents from the backplane power bus as they charge up.
The transient currents can permanently damage the con-
nector pins and glitch the system supply, causing other
boards in the system to reset.
The LT1641 is designed to turn on a boards supply
voltage in a controlled manner, allowing the board to be
safely inserted or removed from a live backplane. The chip
also provides undervoltage and overcurrent protection
while a power good output signal indicates when the
output supply voltage is ready.
Power-Up Sequence
The power supply on a board is controlled by placing an
external N-channel pass transistor (Q1) in the power path
(Figure 5). Resistor R
S
provides current detection and
capacitor C1 provides control of the GATE slew rate.
Resistor R6 provides current control loop compensation
while R5 prevents high frequency oscillations in Q1.
Resistors R1 and R2 provide undervoltage sensing.
After the power pins first make contact, transistor Q1 is
turned off. If the voltage at the ON pin exceeds the turn-on
threshold voltage, the voltage on the V
CC
pin exceeds the
undervoltage lockout threshold, and the voltage on the
TIMER pin is less than 1.233V, transistor Q1 will be turned
on (Figure 6). The voltage at the GATE pin rises with a slope
equal to 10礎(chǔ)/C1 and the supply inrush current is set at
I
INRUSH
= C
L
" 10礎(chǔ)/C1. If the voltage across the current
sense resistor R
S
gets too high, the inrush current will then
be limited by the internal current limit circuitry which
adjusts the voltage on the GATE pin to maintain a constant
voltage across the sense resistor.
Once the voltage at the output has reached its final value,
as sensed by resistors R3 and R4, the PWRGD pin goes
high.
Short-Circuit Protection
The LT1641 features a programmable foldback current
limit with an electronic circuit breaker that protects against
short-circuits or excessive supply currents. The current
limit is set by placing a sense resistor between V
CC
(Pin 8)
and SENSE (Pin 7).
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| LT1671CMS8 | 功能描述:IC COMPARATOR 60NS LOW PWR 8MSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標(biāo)準(zhǔn)包裝:25 系列:- 類型:帶電壓基準(zhǔn) 元件數(shù):4 輸出類型:CMOS，開路漏極，TTL 電壓 - 電源，單路/雙路(±):2 V ~ 11 V，±1 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:10mV @ 5V 電流 - 輸入偏壓（最小值）:- 電流 - 輸出（標(biāo)準(zhǔn)）:0.015mA @ 5V 電流 - 靜態(tài)（最大值）:8.5µA CMRR, PSRR（標(biāo)準(zhǔn)）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:12µs 磁滯:50mV 工作溫度:0°C ~ 70°C 封裝/外殼:16-DIP（0.300"，7.62mm） 安裝類型:通孔 包裝:管件 |
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