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參數(shù)資料
| 型號(hào)： | IR3086 |
| 廠商： | International Rectifier |
| 英文描述： | PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
| 中文描述： | 相位IC帶OVP，故障及超溫檢測(cè) |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大?。?/td> | 417K |
| 代理商： | IR3086 |
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IR3086
Page 10 of 15
9/1/03
The advantage of sensing the inductor current versus high side or low side sensing is that actual output current being
delivered to the load is obtained rather than peak or sampled information about the switch currents. The output
voltage can be positioned to meet a load line based on real time information. Except for a sense resistor in series with
inductor, this is the only sense method that can support a single cycle transient response. Other methods provide no
information during either load increase (low side sensing) or load decrease (high side sensing).
An additional problem associated with peak or valley current mode control for voltage positioning is that they suffer
from peak-to-average errors. These errors will show in many ways but one example is the effect of frequency
variation. If the frequency of a particular unit is 10% low, the peak to peak inductor current will be 10% larger and the
output impedance of the converter will drop by about 10%. Variations in inductance, current sense amplifier
bandwidth, PWM prop delay, any added slope compensation, input voltage, and output voltage are all additional
sources of peak-to-average errors.
Current Sense Amplifier
A high speed differential current sense amplifier is located in the Phase IC, as shown in figure 5. Its gain decreases
with increasing temperature and is nominally 34 at 25oC and 29 at 125oC (-1470 ppm/oC). This reduction of gain tends
to compensate the 3850 ppm/oC increase in inductor DCR. Since in most designs the Phase IC junction is hotter than
the inductor these two effects tend to cancel such that no additional temperature compensation of the load line is
required.
The current sense amplifier can accept positive differential input up to 100mV and negative up to -20mV before
clipping. The output of the current sense amplifier is summed with the DAC voltage and sent to the Control IC and
other Phases through an on-chip 10K
resistor connected to the ISHARE pin. The ISHARE pins of all the phases are
tied together and the voltage on the share bus represents the total current being delivered to the load and is used by
the Control IC for voltage positioning and current limit protection.
Figure 5 – Inductor Current Sensing and Current Sense Amplifier
Average Current Share Loop
Current sharing between phases of the converter is achieved by the average current share loop in each Phase IC.
The output of the current sense amplifier is compared with the share bus less a 20mV offset. If current in a phase is
smaller than the average current, the share adjust error amplifier of the phase will activate a current source that
reduces the slope of its PWM ramp thereby increasing its duty cycle and output current. The crossover frequency of
the current share loop can be programmed with a capacitor at the SCOMP pin so that the share loop does not interact
with the output voltage loop.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3086A | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
| IR3086AM | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
| IR3086AMPBF | 功能描述:IC PHASE CONTROLLER OVP 20MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase™ 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| IR3086AMPBF | 制造商:International Rectifier 功能描述:Controller IC Package/Case:20-MLPQ |
| IR3086AMTR | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
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