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| 型號： | MIC2595R-2BM TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 16/29頁 |
| 文件大?。?/td> | 4205K |
| 描述： | IC CTRLR HOT SWAP NEG HV 14-SOIC |
| 標準包裝： | 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： | -19 V ~ -80 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC2595R-2BMTR MIC2595R-2BMTR-ND |
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Micrel
MIC2589/MIC2595
December 2005
16
M9999-120505
(408) 955-1690
Functional Description
Hot Swap Insertion
When circuit boards are inserted into systems carrying
live supply voltages ( hot swapped ), high inrush
currents often result due to the charging of bulk
capacitance that resides across the circuit boards
supply pins. These current spikes can cause the
systems supply voltages to temporarily go out of
regulation causing data loss or system lock-up. In
more extreme cases, the transients occurring during a
hot swap event may cause permanent damage to
connectors or onboard components.
The MIC2589 and the MIC2595 are designed to
address these issues by limiting the maximum current
that is allowed to flow during hot swap events. This is
achieved by implementing a constant-current loop at
turn-on. In addition to inrush current control, the
MIC2589 and the MIC2595 incorporate input voltage
supervisory functions and user programmable
overcurrent protection, thereby providing robust
protection for both the system and the circuit board.
GATE Start-Up and Control
When the input voltage to the controller is between
the overvoltage and undervoltage threshold settings
(MIC2589) or is greater than the ON threshold setting
(MIC2595), a start cycle is initiated to deliver power to
the load. During the start-up cycle, the GATE pin of
the controller applies a constant charging current
(45礎(chǔ), nominal) to the gate of the external MOSFET,
charging the MOSFET gate from 0V to 10V,
referenced to V
EE
. An external capacitor (C2) can be
used to adjust and control the slew rate of the GATE
output, while resistor R4 can be used to minimize the
potential for parasitic high-frequency oscillations
occurring on the gate of the external MOSFET (M1).
See Typical Application circuit. The following
equation is used to approximate the expected inrush
current given the values of the capacitance at the gate
and the load (i.e., the gate of the external MOSFET
and the drain of the external MOSFET, respectively).
GATE(ON)
GATE
LOAD
I
C
C
INRUSH
?/DIV>
=
Active current limiting for the MIC2589/MIC2595 is
implemented by controlling the voltage on the GATE
pin via an internal feedback circuit. The
MIC2589/MIC2595 is defined to be in current limit
when the GATE output voltage level is between 2.5V
and 5.5V. Once in current limit, the GATE output
voltage is regulated to limit the load current to the
programmed value (I
LIMIT
). Additionally, the
overcurrent delay and the no-load detection timers
must be set accordingly to allow the output load to
fully charge during the start-up cycle. See the Circuit
Breaker Function and No-Load Detection sections
for further details.
Resistor R4, in series with the power MOSFETs gate,
may be required in some layouts to minimize the
potential for parasitic oscillations occurring in M1.
Note that resistance in this device of the circuit has a
slight
destabilizing
effect
upon
the
MIC2589/MIC2595s current regulation loop. If
possible, use high-frequency PCB layout techniques
and use a dummy resistor (R4 = 0&) for the initial
evaluation. If during prototyping an R4 is required,
common values for R4 range between 4.7& to 20& for
various power MOSFETs.
Circuit Breaker Function
The MIC2589 and MIC2595 device family employs an
electronic circuit breaker that protects the external
power MOSFET and other system components
against large-scale faults, such as short circuits. The
current-limit threshold is set via an external resistor,
R
SENSE
, connected between the VEE and SENSE pins.
SENSE
TRIP
LIMIT
R
V
I
=
An overcurrent filter period is set via a capacitor from
the CFILTER pin to ground (C
FILTER
) that determines
the length of the time period (t
FLT
) for which the device
remains in current limit before the circuit breaker is
tripped. This programmable delay prevents tripping of
the circuit breaker due to the large inrush current
charging bulk and distributed capacitive loads.
Whenever the voltage across R
SENSE
exceeds 50mV,
two things happen:
1. A constant-current regulation loop is engaged
which is designed to hold the voltage across
R
SENSE
equal to 50mV. This protects both the
load and the MIC2589/MIC2595 circuits from
excessively high currents. This current-
regulation loop will engage in less than 1祍
from the time at which the overcurrent trip
threshold on R
SENSE
is exceeded.
2. Capacitor C
FILTER
is charged up to an internal
V
CFILTER(TRIP)
threshold of 1.25V by
I
CFILTER(CHARGE)
an internal 95礎(chǔ) current
source. If the voltage across CFILTER
crosses this threshold, the circuit breaker trips
and the GATE pin is immediately pulled low
by an internal current pull-down. This
operation turns off the MOSFET quickly and
disconnects the input from the load. The time
period that allows for the output to regulate in
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| MIC2595R-2YM | 功能描述:熱插拔功率分布 Negative Voltage Hot-Swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2595R-2YM TR | 功能描述:熱插拔功率分布 Negative Voltage Hot-Swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2595R-2YM-TR | 功能描述:Hot Swap Controller, Sequencer 1 Channel -48V 14-SOIC 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 類型:熱交換控制器，序列發(fā)生器 通道數(shù):1 內(nèi)部開關(guān):無 應(yīng)用:-48V 特性:自動重試 可編程特性:限流，故障超時，UVLO 電壓 - 電源:-80 V ~ -19 V 電流 - 輸出（最大值）:- 工作溫度:-40°C ~ 85°C 電流 - 電源:4mA 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:14-SOIC 功能引腳:CFILTER，CNLD，DRAIN，PGTIMER，OFF，ON，/PWRGD1，/PWRGD2，/PWRGD3 標準包裝:1 |
| MIC2596-1BTS | 功能描述:IC SWITCH HOT SWAP DUAL 20-TSSOP 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 標準包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(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 |
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