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參數(shù)資料
| 型號： | MIC2341-5YTQ |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| 封裝： | LEAD FREE, TQFP-48 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 1277K |
| 代理商： | MIC2341-5YTQ |
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Micrel, Inc.
MIC2341/2341R
October 2007
20
M9999-102507-A
(408) 944-0800
Good” flag is asserted is a simple matter of substituting
R3VSENSE[A/B]
for
R12VSENSE[A/B],
CLOAD(3VOUT[A/B])
for
CLOAD(12VOUT[A/B]), and VUVTH(3V) for VUVTH(12V).
Even though individual internal “Power Good” flags may
be asserted, the conditions under which the MIC2341’s
external /PWRGD[A/B] and /DLY_PWRGD[A/B] digital
outputs are asserted is described in the section labeled
“/PWRGD[A/B] and /DLY_PWRGD[A/B] Digital Outputs.”
Power-Down Cycle
When a slot is turned off, resistors internal to the
MIC2341/MIC2341R are connected to each of the
outputs to provide a discharge path for capacitors
connected to the part’s outputs. The nominal output
discharge resistance values for each rail are found in the
“Electrical Characteristics” table.
Use of an External Gate Capacitor to Control Inrush
Current Profile
In PCI Express applications where the 12VOUT[A/B] and
the 3VOUT[A/B] maximum load capacitance is 1000 F
(2000uF on the 12V rail for x16 modules), the PCI
Express power control specification clearly states that
any inrush current rate-of-change shall not exceed
0.1A/s. This situation is most likely to happen when the
controller is charging these large load capacitances in
current limit. Under these circumstances, it may be
preferable to modify the gate drive by using GATE
voltage control instead of active current regulation to
charge the load. As shown in Figure 5, an external
capacitor connected from each 3VGATE[A/B] to AGND
can be used. For the 12VGATE[A/B], an optional Miller
capacitor (Gate-Drain) can be used in conjunction with a
Gate-Source capacitor to form a Miller integrator to
control the output slew rate. The optimal capacitor value
is best determined empirically as the magnitude of the
inrush current slew rate is a function of the power
MOSFET’s
input
capacitance
(CISS),
the
load
capacitance (CLOAD(3VOUT[A/B]) and CLOAD(12VOUT[A/B])), and
the
current-limit
sense
resistor
(R3VSENSE[A/B]
and
R12VSENSE[A/B). Using an external capacitor to control the
gate voltage slew rate for large load capacitance may
affect the MIC2341/MIC2341R’s specified system turn-
on and turn-off time performance.
Figure 5. (Optional) External Gate Slew Control Components
相關(guān)PDF資料 |
PDF描述 |
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| MIC2937A-4.8BT | 4.8 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PSFM3 |
| MIC3-10-+/-5%-B | 1 ELEMENT, 0.01 uH, GENERAL PURPOSE INDUCTOR, SMD |
| MIC3-680-+/-5%-B | 1 ELEMENT, 0.68 uH, GENERAL PURPOSE INDUCTOR, SMD |
| MIC3-68-+/-5%-B | 1 ELEMENT, 0.068 uH, GENERAL PURPOSE INDUCTOR, SMD |
| MIC3-6.8-+/-5%-E | 1 ELEMENT, 0.0068 uH, GENERAL PURPOSE INDUCTOR, SMD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2341R-2YTQ | 功能描述:熱插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller 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 |
| MIC2341R-2YTQ TR | 功能描述:熱插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller 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 |
| MIC2342-2YTQ | 功能描述:熱插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller 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 |
| MIC2342-2YTQ TR | 功能描述:熱插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller 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 |
| MIC2342R-2YTQ | 功能描述:熱插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller 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 |
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