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參數(shù)資料
| 型號(hào)： | MIC2580 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Hot-Swap PCI Power Controller(熱交換PCI功率控制器) |
| 中文描述： | 熱插拔PCI電源控制器（熱交換的PCI功率控制器） |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 288K |
| 代理商： | MIC2580 |
MIC2580
Functional Description
Start-Up Sequence
The start-up sequence is initiated when /ON is asserted and
all four supplies are connected to the inputs. During the start-
up sequence, all four gates ramp up at a rate determined by
C
SLEW
. During this time /PWRGD is deasserted until all four
supplies
are
within
specified
/PWRGD is asserted the power-on-reset signal /POR timer
begins. The time period is defined by C
RST
. Refer to Figure
1 for a timing diagram of the signals during the start-up
sequence.
During the start-up sequence, a current source charges
C
START
at a constant rate until a threshold voltage of 2.4V is
reached. This period of time defines an interval during which
overcurrent events are ignored. This prevents high inrush
currents that normally occur when charging capacitance
erroneously asserting /FAULT. The magnitude of the start-
up time, t
START
is defined by C
START
.
The MIC2580 employs foldback current limiting that ensures
the device starts up in current limit. This minimizes high
inrush currents due to ramping a voltage into capacitance
regardless of the size of the load capacitance.
Overcurrent Detection
The MIC2580 senses overcurrent via the use of external
sense resistors for the 5V and 3.3V supply rails. When the
sense voltage across these resistors is greater than or equal
to 50mV an overcurrent condition is detected. Therefore the
overcurrent set point is determined by I
LIMIT
= 50mV/R
SENSE
.
For the +12V and
–
12V supply rails overcurrent detection is
set internally at 1.3A and
–
0.5A respectively.
When an overcurrent condition is detected /FAULT is as-
serted only if the overcurrent condition lasts for a minimum
time period of 10
μ
s. This delay prevents spurious noise from
the system erroneously tripping the circuit breaker and as-
serting /FAULT. Upon /FAULT being asserted an internal
latch is set that immediately turns off all four supplies to
prevent further damage to the system. Toggling /ON will reset
the latch and initiate another start-up sequence. Figures 2
and 3 depict the timing for two fault conditions.
Micrel
MIC2580
18
July 2000
levels.
When
Thermal Shutdown
The +12V and
–
12V internal MOSFET switches are protected
by current limit and overtemperature shutdown circuitry.
When the die temperature exceeds 160
°
C, /FAULT is as-
serted and all supplies are shut off. The power dissipated in
the MIC2580 is primarily due to the sum of current flowing
through the internal MOSFET switches and, to a lesser
extent, power dissipated due to the supply current. To com-
pute the total power dissipation of the MIC2580 the following
equation is used:
P
D(total)
= P
D(+12V switch)
+ P
D(
–
12V switch)
+ P
D(supplies)
where:
P
D(switches)
= R
DS(on)
×
I
OUT2
P
D(supplies)
= V
SUPPLY
×
I
SUPPLY
To relate this to operating junction temperature:
T
J
= P
D
×
θ
JA
+ T
A
where:
T
A
= ambient temperature
θ
JA
= package thermal resistance
Precharge Voltage
For CompactPCI applications, the MIC2580-1.0BSM/BTS
integrates a 1V
±
20% voltage source that satisfies
CompactPCI precharge requirements. The voltage source
can provide up to 10mA. For higher current, the MIC2580-
1.6BSM/BTS integrates a 1.6V
±
20% voltage source to bias
a NPN transistor.
MIC2580-1.6
VPCHG
DATA
BUS
R
I > 10mA
+5V
Figure 5. Voltage Source
Turnoff
Deasserting /ON will turn off all four supplies. Alternatively
driving /FAULT low will turn off all supplies but will not latch
the supplies off. Releasing /FAULT will initiate a new start
sequence.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2588 | Single-Channel, Negative High-Voltage Hot Swap Power Controllers |
| MIC2588-1BM | Single-Channel, Negative High-Voltage Hot Swap Power Controllers |
| MIC2588-2BM | Single-Channel, Negative High-Voltage Hot Swap Power Controllers |
| MIC2594 | Single-Channel, Negative High-Voltage Hot Swap Power Controllers |
| MIC2594-1BM | Single-Channel, Negative High-Voltage Hot Swap Power Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2580-1.0BTS | 制造商:Micrel Inc 功能描述:Hot Swap Controller 24-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2580-1.0BTSTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2580-1.6BTS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2580A-1.0BTS | 功能描述:IC CTRLR HOTSWAP PCI PWR 24TSSOP 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 |
| MIC2580A-1.0BTS TR | 功能描述:IC CTRLR PCI HOT SWAP 24-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(biāo)準(zhǔn)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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