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| 型号： | ISL6112IRZA |
| 厂商： | Intersil |
| 文件页数： | 12/30页 |
| 文件大小： | 938K |
| 描述： | IC PWR CNTRLR DUAL SLT 48-QFN |
| 标准包装： | 43 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN-EP（7x7） |
| 包装： | 管件 |
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ISL6112
12
FN6456.1
August 25, 2011
Functional Description
The ISL6112 protects the power supplies in PCI-Express systems
that utilize hot-pluggable add-in cards. This IC, together with two
each of N-Channel and P-Channel MOSFETs, four current sense
resistors, and a few external passive components, provides a
compliant hot plug power control solution to any combination of
two PCI-Express X1, X4, X8 or X16 slots.
The ISL6112 primarily features start-up in-rush current
protection, maximum current regulated (CR) levels for each of
the MAIN and AUX outputs, and programmable CR duration so
that both fault isolation protection and imperviousness to
electrical transients are provided. The ISL6112 also offers input
and output voltage supervisory functions and two operational
system interfaces for implementation flexibility.
In-Rush Current Protection
When any electronic circuitry is powered up, there is an in-rush of
current due to the charging of bulk capacitance that resides
across the circuit board supply pins. This transient in-rush current
may cause the system supply voltages to temporarily droop out
of regulation, causing data loss or system lock-up. The ISL6112
addresses these issues by limiting the in-rush currents to the
PCI-Express add-in cards, thereby controlling the rate at which
the load circuits turn on. See Figures 17, 18, 19, 20, 21 and 22
for AUX and MAIN turn-on examples that illustrate the current
limiting capabilities across a variety of compensation component
values.
MAIN Supply Overcurrent Protection
For each of the 3VMAIN and 12VMAIN supplies, the current
regulated (CR) levels are set by a sub ohm value sense resistor.
The value for 12VMAIN is dependant on the size of the
PCI-Express connector (X1, X4/X8 or X16) to be powered. The
voltage across this resistor is compared to a 50mV internal
reference, providing a nominal CR protection level that would be
set above the maximum specified slot limits. The 3.3VMAIN
supply can use a 15m?sense resistor compared to a 50mV
reference to provide a nominal regulated current limit of 3.3A, as
this supply has a common 3A maximum across all slot sizes. For
both MAIN supplies, there is a Way Overcurrent (WOC) shutdown
protocol that is without a CR duration. WOC is invoked if the load
current causes the RSENSE voltage to be >100mV (see Figures
23 and 24).
VAUX Supply Overcurrent Protection
The VAUX load current is internally monitored and controlled via
an internal power FET. This FET has a typical r
DS(ON)
of 320m& at
a VAUX current of 375mA to minimize distribution losses to
typically <100mV through the IC. Using active monitoring and
control, the ISL6112 provides nominal limiting to ~1000mA of
load current across the temperature range and for various
loading conditions. See Figures 17, 25 and 26 for examples of
this performance.
Current Regulation (CR) Duration
The CR duration for each slot is set by an external capacitor
between the associated CFILTER pin and ground. This feature
masks current transients and overcurrents prior to supply
turn-off. Once the CR duration has expired, the IC quickly turns
off the associated MAIN outputs via its external FETs or the failed
AUX output, unloading the faulted load card from the supply
voltage rails.
UVLO, Power-Good, and FAULT
The ISL6112 incorporates undervoltage lock-out (UVLO)
protections on each of the four MAIN VIN and two VSTBY supplies
to prevent operation during a brown-out condition. Likewise, on
the outputs are minimum voltage compliances that must be
satisfied for the Power-Good output, PWRGD, to be asserted.
There is some hysteresis on the UVLO levels as the voltage on VIN
decreases to ensure IC operation below the minimum operating
supply standards. The FAULT
output is asserted (low) whenever
there is an OC, OT or UV condition. The FAULT
is cleared once the
appropriate enable is deasserted.
Operational System Interfaces
The ISL6112 employs two system interfaces: the hardware
Hot-Plug Interface (HPI) and the System Management Interface
(SMI). The HPI I/O includes ON, AUXEN, FAULT
and PWRGD
. The
SMI I/O consists of SDA, SCL, and INT
, the signals of which
conform to the levels and timing of the SMBus specification (see
FIGURE 15. FILTER CHARGE CURRENT vs TEMPERATURE
FIGURE 16. FILTER THRESHOLD VOLTAGE vs TEMPERATURE
Typical Performance Curves (Continued)
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
-60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (癈)
1.20
1.22
1.24
1.26
1.28
1.30
-60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (癈)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6112IRZA-T | 功能描述:热插拔功率分布 8LD 7X7 DL SLOT PCI EXPR HOT PLUG CONTRO 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 |
| ISL6113 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Slot PCI-E Hot Plug Controllers |
| ISL6113EVAL1Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Slot PCI-E Hot Plug Controllers |
| ISL6113IRZA | 功能描述:热插拔功率分布 4 8LD 7X7 DL SLOT PCI-E HOT PLUG CNTRL 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 |
| ISL6113IRZA-T | 功能描述:热插拔功率分布 4 8LD 7X7 DL SLOT PCI-E HOT PLUG CNTRL 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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