- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄42 > LTC4232CDHC#TRPBF (Linear Technology)IC CTLR HOT SWAP 5A 16-DFN Datasheet資料下載
參數(shù)資料
| 型號： | LTC4232CDHC#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 242K |
| 描述： | IC CTLR HOT SWAP 5A 16-DFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | 服務(wù)器，儲存，通信，嵌入式，消費品 |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 可調(diào) |
| 電源電壓： | 2.9 V ~ 15 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-DFN（5x3） |
| 包裝： | 帶卷 (TR) |
LTC4232
10
4232fa
applicaTions inForMaTion
An overcurrent fault occurs when the current limit circuitry
has been engaged for longer than the timeout delay set
by the TIMER. Current limiting begins when the MOSFET
current reaches 1.5A to 5.6A (depending on the foldback).
The GATE pin is then brought down with a 140mA GATE-
to-OUT current. The voltage on the GATE is regulated in
order to limit the current to less than 5.6A. At this point,
a circuit breaker time delay starts by charging the external
timing capacitor from the TIMER pin with a 100礎(chǔ) pull-
up current. If the TIMER pin reaches its 1.2V threshold,
the internal switch turns off (with a 250礎(chǔ) current from
GATE to ground). Included in the Typical Performance
Characteristics curves is a graph of the Safe Operating
Area for the MOSFET. From this graph one can determine
the MOSFETs maximum time in current limit for a given
output power.
Tying the TIMER pin to INTV
CC
will force the part to use
the internally generated (circuit breaker) delay of 2ms. In
either case the FLT pin is pulled low to indicate an over-
current fault has turned off the pass MOSFET. For a given
the circuit breaker time delay, the equation for setting the
timing capacitors value is as follows:
C
T
= t
CB
" 0.083(礔/ms)
After the switch is turned off, the TIMER pin begins
discharging the timing capacitor with a 2礎(chǔ) pull-down
current. When the TIMER pin reaches its 0.2V threshold,
an internal 100ms timer is started. After the 100ms delay,
the switch is allowed to turn on again if the overcurrent
fault has been cleared. Bringing the UV pin below 0.6V
and then high will clear the fault. If the TIMER pin is tied
to INTV
CC
then the switch is allowed to turn on again (after
an internal 100ms delay) if the overcurrent fault is cleared.
Tying the FLT pin to the UV pin allows the part to self-
clear the fault and turn the MOSFET on as soon as TIMER
pin has ramped below 0.2V. In this auto-retry mode the
LTC4232 repeatedly tries to turn on after an overcurrent
at a period determined by the capacitor on the TIMER pin.
The auto-retry mode also functions when the TIMER pin
is tied to INTV
CC
.
The waveform in Figure 4 shows how the output latches
off following a short-circuit. The current in the MOSFET
is 1.4A as the timer ramps up.
10礔, especially if the wiring inductance from the supply
to the V
DD
pin is greater than 3礖. The possibility of oscil-
lation will increase as the load current (during power-up)
increases. There are two ways to prevent this type of
oscillation. The simplest way is to avoid load capacitances
below 10礔. For wiring inductance larger than 20礖, the
minimum load capacitance may extend to 100礔. A second
choice is to connect an external gate capacitor C
P
>1.5nF
as shown in Figure 3.
Figure 3. Compensation for Small C
LOAD
4232 F03
LTC4232
*OPTIONAL
RC TO LOWER
INRUSH CURRENT
GATE
C
P
2.2nF
Turn-Off Sequence
The switch can be turned off by a variety of conditions. A
normal turn-off is initiated by the UV pin going below its
1.235V threshold. Additionally, several fault conditions
will turn off the switch. These include an input overvolt-
age (OV pin), overcurrent circuit breaker (SENSE pin) or
overtemperature. Normally the switch is turned off with
a 250礎(chǔ) current pulling down the GATE pin to ground.
With the switch turned off, the OUT voltage drops which
pulls the FB pin below its threshold. PG then pulls low to
indicate output power is no longer good.
If V
DD
drops below 2.65V for greater than 5祍 or INTV
CC
drops below 2.5V for greater than 1祍, a fast shutdown
of the switch is initiated. The GATE is pulled down with a
140mA current to the OUT pin.
Overcurrent Fault
The LTC4232 features an adjustable current limit with
foldback that protects against short-circuits or excessive
load current. To prevent excessive power dissipation in the
switch during active current limit, the available current is
reduced as a function of the output voltage sensed by the
FB pin. A graph in the Typical Performance Characteristics
curves shows the current limit versus FB voltage.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4240IGN#TRPBF | IC CTRLR HOTSWAP CPCI I2C 28SSOP |
| LTC4241IGN#PBF | IC CTRLR HOTSWAP 3.3V AUX 20SSOP |
| LTC4242CUHF#TRPBF | IC CNTRLR HOT SWAP 38-QFN |
| LTC4244CGN-1#TRPBF | IC CTRLR HOTSWAP PCI 20-SSOP |
| LTC4245CG#TRPBF | IC CNTRLR HOT SWAP 36-SSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4232IDHC#PBF | 功能描述:IC CTLR HOT SWAP 5A 16-DFN 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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4232IDHC#TRPBF | 功能描述:IC CTLR HOT SWAP 5A 16-DFN 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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4240 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:CompactPCI Hot Swap Controller with I2C Compatible Interface |
| LTC4240CGN | 功能描述:IC CTRLR HOTSWAP CPCI I2C 28SSOP 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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4240CGN#PBF | 功能描述:IC CTLR HOT SWAP CPCI I2C 28SSOP 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(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。