- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄41 > LT4254CGN (Linear Technology)IC CTRLR HOTSWAP POSVOLT 16SSOP Datasheet資料下載
參數(shù)資料
| 型號(hào)： | LT4254CGN |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 232K |
| 描述： | IC CTRLR HOTSWAP POSVOLT 16SSOP |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開(kāi)關(guān)： | 無(wú) |
| 電源電壓： | 10.8 V ~ 36 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1341 (CN2011-ZH PDF) |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)當(dāng)前第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
LT4254
10
4254fb
APPLICATIO S I FOR ATIO
U
U
U
Resistor R7 compensates the current control loop while
R6 prevents high frequency oscillations in Q1.
When the power pins first make contact, transistor Q1 is
held off. If the voltage on the V
CC
pin is between the
externally programmed undervoltage and overvoltage
thresholds, and the voltage on the TIMER pin is less than
4.65V (typ), transistor Q1 will be turned on (Figure 6). The
voltage at the GATE pin rises with a slope equal to 35礎(chǔ)/
C1 and the supply inrush current is set at:
I
INRUSH
= C
L
" 35礎(chǔ)/C1
If the voltage across the current sense resistor R5 reaches
V
SENSETRIP
, the inrush current will be limited by the
internal current limit circuitry. The voltage on the GATE pin
is adjusted to maintain a constant voltage across the sense
resistor and the TIMER pin begins to charge.
When the FB pin voltage goes above the low-to-high V
FB
threshold, the PWRGD pin goes high.
Short-Circuit Protection
The LT4254 features a programmable foldback current
limit with an electronic circuit breaker that protects against
short circuits or excessive load currents. The current limit
is set by placing a sense resistor (R5) between V
CC
and
SENSE.
To limit excessive power dissipation in the pass transistor
and to reduce voltage spikes on the input supply during
short-circuit conditions at the output, the current folds
Figure 5. 2A, 24V Application
4254 F05
R5
0.025&
LT4254
SENSE
13
10
5
7
8
16
15
1
2
4
9
V
CC
GATE
FB
PWRGD
RETRY
UV
OV
TIMER
GND
V
IN
24V
GND
(SHORT PIN)
Q1
IRF530
D1
CMPZ5241B
11V
R3
40.2k
R2
40.2k
R1
324k
R7
100&
R9
40.2k
R6
10&
R8
140k
PWRGD
V
OUT
24V
1.5A
R4
27k
C
L
C2
33nF
C3
0.1礔
C1
10nF
OPEN
UV = 20V
OV = 40V
PWRGD = 18V
back as a function of the output voltage, which is sensed
internally on the FB pin.
When the voltage at the FB pin is 0V, the current limit
circuit drives the GATE pin to force a constant 12mV drop
across the sense resistor. As the output at the FB pin
increases, the voltage across the sense resistor increases
until the FB pin reaches 2V, at which point the voltage
across the sense resistor is held constant at 50mV (see
Figure 7). The current limit threshold is calculated as:
I
LIMIT
= 50mV/R5
where R5 is the sense resistor.
For a 0.025& sense resistor, the current limit is set at
2000mA and folds back to 600mA when the output is
shorted to ground. Thus, MOSFET dissipation under short-
circuit conditions is reduced from 36W to12W. See the
Figure 6. Start-Up Waveforms
2.5ms/DIV
4254 F06
I
OUT
500mA/DIV
PWRGD
20V/DIV
V
OUT
20V/DIV
GATE
20V/DIV
C
L
= 185礔
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT4256-1IS8#TRPBF | IC CTRLR HOTSWAP HV LATCH 8SOIC |
| LTC1392IS8#TRPBF | IC DATA ACQ SYSTEM 10BIT 8-SOIC |
| LTC1421ISW-2.5#PBF | IC CONTROLLER HOT SWAP 24-SOIC |
| LTC1422CN8 | IC CONTROLLER HOT SWAP 8-DIP |
| LTC1642CGN#TRPBF | IC CONTROLLER HOTSWAP ADJ 16SSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT4254CGN#PBF | 功能描述:IC CTRLR HOTSWAP POSVOLT 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LT4254CGN#TR | 功能描述:IC CTLR HOTSWAP POS 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LT4254CGN#TRPBF | 功能描述:IC CTRLR HOTSWAP POSVOLT 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LT4254IGN | 功能描述:IC CTLR HOTSWAP POS 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LT4254IGN#PBF | 功能描述:IC CTLR HOTSWAP POS 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。