参数资料
| 型号： | ISL62771IRTZ |
| 厂商： | Intersil |
| 文件页数： | 25/36页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR MULTIPHASE 40TQFN |
| 标准包装： | 60 |
| 系列： | Robust Ripple Regulator™ (R³) |
| 应用： | 控制器，AMD Fusion? SVI 2.0 CPU GPU |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 2 |
| 输出电压： | 0.006 V ~ 1.55 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 管件 |
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ISL62771
Telemetry
The ISL62771 can provide voltage and current information
through the telemetry system outlined by the AMD SVI2
specification. The telemetry data is transmitted through the SVC
and SVT lines of the SVI 2 interface.
Current telemetry is based on a voltage generated across a
133k Ω resistor placed from the IMON pin to GND. The current
flowing out of the IMON pin is proportional to the load current in
conversion from the load current to the internal amplifier created
I sum current. The I sum current is then divided down by a factor of
4 to create the IMON current, which flows out of the IMON pin.
The I sum current will measure 35μA when the load current is at
full load based on a droop current designed for 45μA at the same
load current. The difference between the I sum current and the
droop current is provided in Equation 2. The IMON current will
measure 11.25μA at full load current for the VR and the IMON
voltage will be 1.2V. The load percentage, which is reported by
the IC is based on this voltage. When the load is 25% of the full
load, the voltage on the IMON pin will be 25% of 1.2V or 0.3V.
The SVI interface allows the selection of no telemetry, voltage
only, or voltage and current telemetry on either or both of the VR
outputs. The TFN bit along with the Core and Northbridge domain
selector bits are used by the processor to change the
functionality of telemetry, see Table 12 for more information.
TABLE 12. TFN TRUTH TABLE
current value for the AMD CPU load is used to set the maximum
current level for droop and the IMON voltage of 1.2V, which
indicates 100% loading for telemetry. The ISUM current level at
maximum load, or IDD spike is 36μA and this translates to an IMON
current level of 9μA. The IMON resistor is 133k Ω and the 9μA
flowing through the IMON resistor results in a 1.2V level at
maximum loading of the VR.
The overcurrent threshold is 1.5V on the IMON pin. Based on a
1.2V IMON voltage equating to 100% loading, the additional 0.3V
provided above this level equates to a 25% increase in load current
before an OCP fault is detected. The EDC or IDD spike current is
used to set the 1.2V on IMON for full load current. So the OCP level
is 1.25x the EDC or IDD spike current level. This additional margin
above the EDC or IDD spike current allows the AMD CPU to enter
and exit the IDD spike performance mode without issue unless the
load current is out of line with the IDD spike expectation, thus the
need for overcurrent protection.
When the voltage on the IMON pin meets the overcurrent
threshold of 1.5V, this triggers an OCP event. Within 2μs of
detecting an OCP event, the controller asserts VR_HOT_L low to
communicate to the AMD CPU to throttle back. A fault timer
begins counting while IMON is at or above the 1.5V threshold. The
fault timer lasts 7.5μs to 11μs and then flags an OCP fault. The
controller then tri-states the active channels and goes into
shutdown. PGOOD is taken low and a fault flag from this VR is sent
to the other VR and it is shutdown within 10μs. If the IMON voltage
drops below the 1.5V threshold prior to the fault timer count
finishing, the fault timer is cleared and VR_HOT_L is taken high.
TFN, CORE, NB
BITS [21,6,7]
1,0,1
1,0,0
1,1,0
1,1,1
DESCRIPTION
Telemetry is in voltage and current mode. Therefore,
voltage and current are sent for VDD and VDDNB
domains by the controller.
Telemetry is in voltage mode only. Only the voltage of
VDD and VDDNB domains is sent by the controller.
Telemetry is disabled.
Reserved
The ISL62771 also features a way-overcurrent [WOC] feature,
which immediately takes the controller into shutdown. This
protection is also referred to as fast overcurrent protection for
short-circuit protection. If the IMON current reaches 15μA, WOC is
triggered. Active channels are tri-stated and the controller is
placed in shutdown and PGOOD is pulled low. There is no fault
timer on the WOC fault, the controller takes immediate action. The
other controller output is also shutdown within 10μs.
Current-Balance
The controller monitors the ISENx pin voltages to determine
Protection Features
Core VR and Northbridge VR both provide overcurrent,
current-balance, undervoltage, and overvoltage fault protections.
The controller also provides over-temperature protection. The
following discussion is based on Core VR and also applies to the
Northbridge VR.
Overcurrent
The IMON voltage provides a means of determining the load
current at any moment in time. The overcurrent protection (OCP)
circuitry monitors the IMON voltage to determine when a fault
occurs. Based on the previous description in the“Voltage
current, which flows out of the IMON pin is proportional to the
ISUM current. The ISUM current is created from the sensed voltage
across Cn which is a measure of the load current based upon the
sensing element selected. The IMON current is generated
internally and is 1/4 of the ISUM current. The EDC or IDD spike
25
current-balance protection. If the ISENx pin voltage difference is
greater than 9mV for 1ms, the controller will declare a fault and
latch off.
Undervoltage
If the VSEN voltage falls below the output voltage VID value plus
any programmed offsets by -325mV, the controller declares an
undervoltage fault. The controller de-asserts PGOOD and
tri-states the power MOSFETs.
Overvoltage
If the VSEN voltage exceeds the output voltage VID value plus any
programmed offsets by +325mV, the controller declares an
overvoltage fault. The controller de-asserts PGOOD and turns on the
low-side power MOSFETs. The low-side power MOSFETs remain on
until the output voltage is pulled down below the VID set value. Once
the output voltage is below this level, the lower gate is tri-stated. If
the output voltage rises above the overvoltage threshold again, the
protection process is repeated. when all power MOSFETs are turned
FN8321.2
September 12, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62771IRTZ-T | 功能描述:IC PWM CTRLR MULTIPHASE 40TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:Robust Ripple Regulator™ (R³) 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 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（7x7） 包装:管件 |
| ISL62773 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for AMD Fusiona?￠ Desktop CPUs Using SVI 2.0 |
| ISL62773HRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62773HRZ-T | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62773IRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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