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| 型号： | IR3514MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/46页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROL HYBRD 40-MLPQ |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-MLPQ |
| 供应商设备封装： | 40-MLPQ（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3514MTRPBFDKR |
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IR3514
v L
i L
Current
Sense Amp
L
R CS
R L
c
C CS
v CS
V O
C O
other phases through an on-chip 3K ? UHVLVWRU FRQQHFWHG WR WKH ,6+$5( SLQ 7KH ,6+$5( SLQV RI DOO WKH SKDVHV DUH
CSOUT
Figure 8 Inductor Current Sensing and Current Sense Amplifier
The advantage of sensing the inductor current, versus high side or low side sensing, is that the actual output current
being delivered to the load is obtained rather than sensing only a 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 the 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 8. Its gain is
nominally 32.5 at 25oC, and the 3850 ppm/oC increase in inductor DCR should be compensated in the voltage loop
feedback path.
The current sense amplifier can accept positive differential input up to 50mV and negative up to -10mV before
clipping. The output of the current sense amplifier is summed with the DAC voltage and sent to the control IC and
tied together and the voltage on the share bus represents the average current through all the inductors and is used
by the control IC for voltage positioning and current limit protection.
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 average current at the share bus. If current in a phase is
smaller than the average current, the share adjust amplifier of the phase will pull down the starting point of the PWM
ramp thereby increasing its duty cycle and output current; if current in a phase is larger than the average current,
the share adjust amplifier of the phase will pull up the starting point of the PWM ramp thereby decreasing its duty
cycle and output current. The current share amplifier is internally compensated so that the crossover frequency of
the current share loop is much slower than that of the voltage loop and the two loops do not interact.
Page 16 of 46
10/30/2007
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相关代理商/技术参数 |
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|---|---|
| IR3515SPBF | 制造商:International Rectifier 功能描述:MOSFET, Power;N-Ch;VDSS 150V;RDS(ON) 0.045Ohm;ID 41A;D2Pak;PD 200W;VGS +/-30V |
| IR3519 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Synchronous MOSFET GateDriver IC |
| IR3519MTRPBF | 功能描述:功率驱动器IC SYNC MOSFET GATE DRVR IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR3519STRPBF | 功能描述:功率驱动器IC SYNC FET Gate DRVR 15ms 3.3 and 5V 0.4 RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR3521 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM AMD SVID CONTROL IC |
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