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参数资料
| 型号： | IR3513ZMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE3 POL 32-MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 3mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-MLPQ（5x5） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
NOT RECOMMENDED FOR NEW DESIGNS
REPLACEMENT PRODUCT – IR3513ZMTRPBF
v L
IR3513
i L
Current
Sense Amp
L
R CS
R L
C CS
c
v CS
V O
C
CSOUT
Figure 6 - Inductor Current Sensing and Current Sense Amplifier
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 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 included in both the IR3513 and optional phase ICs, as shown in
Figure 6. Its gain is nominally 33 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 VREF voltage and sent to other phases
through an on-chip 3K ? 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 average current through all the inductors and is used by the control
IC for voltage positioning and current limit protection. The input offset of this amplifier is calibrated to +/- 1mV in
order to reduce the current sense error.
The input offset voltage is the primary source of error for the current share loop. In order to achieve very small input
offset error and superior current sharing performance, the current sense amplifier continuously calibrates itself. This
calibration algorithm creates ripple on ISHARE bus with a frequency of fsw/896.
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 15
May 11, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3513ZMTRPBF-CUT TAPE | 制造商:IR 功能描述:IR3513 Series 16 V 3 mA Surface Mount XPhase3 POL Control IC - MLPQ-32 |
| IR3514 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM AMD HYBRID CONTROL IC |
| IR3514MPBF | 制造商:International Rectifier 功能描述: |
| IR3514MTRPBF | 功能描述:开关变换器、稳压器与控制器 COMPLETE AMD SVID OR PVID PWR SOLUTION RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| 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 |
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