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| 型号： | MIC2341-2YTQ TR |
| 厂商： | Micrel Inc |
| 文件页数： | 20/32页 |
| 文件大小： | 1277K |
| 描述： | IC HOT PLUG CTLR DUAL PCI 48TQFP |
| 标准包装： | 2,000 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 3.3V，12V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP |
| 供应商设备封装： | 48-TQFP（7x7） |
| 包装： | 带卷 (TR) |
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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
R
3VSENSE[A/B]
for R
12VSENSE[A/B]
, C
LOAD(3VOUT[A/B])
for
C
LOAD(12VOUT[A/B])
, and V
UVTH(3V)
for V
UVTH(12V)
.
Even though individual internal Power Good flags may
be asserted, the conditions under which the MIC2341s
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 parts 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 礔
(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/祍. 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
MOSFETs input capacitance (C
ISS
), the load
capacitance (C
LOAD(3VOUT[A/B])
and C
LOAD(12VOUT[A/B])
), and
the current-limit sense resistor (R
3VSENSE[A/B]
and
R
12VSENSE[A/B
). Using an external capacitor to control the
gate voltage slew rate for large load capacitance may
affect the MIC2341/MIC2341Rs specified system turn-
on and turn-off time performance.
Figure 5. (Optional) External Gate Slew Control Components
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2341R-2YTQ | 功能描述:热插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2341R-2YTQ TR | 功能描述:热插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2342-2YTQ | 功能描述:热插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2342-2YTQ TR | 功能描述:热插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2342R-2YTQ | 功能描述:热插拔功率分布 Dual -Slot PCI Express Hot-Plug Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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