參數(shù)資料
型號(hào)： MCP18480
廠(chǎng)商： Microchip Technology Inc.
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： -48V Hot Swap Controller
中文描述： - 48V熱插拔控制器
文件頁(yè)數(shù)： 35/64頁(yè)
文件大?。?/td> 871K
代理商： MCP18480
2003 Microchip Technology Inc.
DS20091B-page 35
MCP18480
TIMER
10
I
A
Current Limit Timer.
The value of the external capacitor (C
TIMER
) connected to the TIMER
pin sets the two time periods used during a current-limit event. These
are:
The time that the GATE pin will limit the current through the
external FET
The time that the GATE pin will disable the external FET
During current limit, a pull-up current source charges up the external
capacitor. Until the voltage on the TIMER pin reaches V
REFIN
/2, the
GATE pin is driven to maintain a reduced current flow determined by
the V
DS
of the external FET.
While the capacitor is being discharged by the pull-down current (pull-
up current is off), the GATE pin is at V
NEG
and the PWRGOOD pin is
deasserted. When the TIMER voltage falls below approximately
100 mV, the GATE pin turns on, if the RESTART pin is low, to reset the
internal fault latch. If the RESTART pin is high, the GATE pin remains
off until the ENABLE pin is forced low. It is then forced high or the
RESTART pin is forced low (asserted).
The PWRGOOD pin reasserts after the voltages on the DRAIN
TH
and
GATE pins meet the appropriate conditions.
The TIMER pin pull-up current is proportioned to the I
ISET
current
(approximately a multiple of 16).
Negative supply input.
V
NEG
11
I
P
The negative voltage applied to the board by the backplane (typically
the most negative voltage in the system).
External MOSFET activation delay.
R
DISCH
12
I
A
An external resistor (R
RDISCH
) is connected between the R
DISCH
pin
and the V
NEG
pin and is used to set the delay between the deactivation
and activation of the external pass MOSFET during a current-limit
event. The delay is set by the values of the external capacitor (C
TIMER
)
and the external resistor (R
RDISCH
). The formulas are:
T
DEACT
= (C
TIMER
x R
ISET
) / 16
T
ACT
= (9.2 x R
RDISCH
x C
TIMER
)
ST = Schmitt Trigger input with CMOS levels
O = Output
CMOS = CMOS-compatible input
D = Digital
TABLE 3-1:
MCP18480 PIN DESCRIPTIONS (CONTINUED)
Pin Name
Pin
Number
Pin
Direction
Buffer
Type
Description
SSOP
Legend: TTL = TTL compatible input
I = Input
P = Power
A = Analog
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MCP18480-I/SS 功能描述:熱插拔功率分布 48V Hot Swap 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
MCP18480T-I/SS 功能描述:熱插拔功率分布 48V Hot Swap 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
MCP-18H 制造商:Taiyo Electric Ind. 功能描述:
MCP-18-I9-LL 制造商:YAMAICHI 制造商全稱(chēng):Yamaichi Electronics Co., Ltd. 功能描述:MatchCon
MCP-18-TI9-LL 制造商:YAMAICHI 制造商全稱(chēng):Yamaichi Electronics Co., Ltd. 功能描述:MatchCon
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