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| 型号： | IR3503MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE VR11.0/1 32-MLPQ |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 4.75 V ~ 7.5 V |
| 工作温度： | 0°C ~ 100°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： | 标准包装 |
| 其它名称： | IR3503MTRPBFDKR |
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IR3503
T SLEW =
L * ( I MAX ? I MIN )
V O + V BODYDIODE
Since the voltage drop in the body diode is often comparable to the output voltage, the inductor current slew rate can
be increased significantly. This patented technique is referred to as “body braking” and is accomplished through the
“body braking comparator” located in the phase IC. If the error amplifier’s output voltage drops below the output voltage
of the share adjust amplifier in the phase IC, this comparator turns off the low side gate driver, enabling the bottom
FET body diode to take over. There is 100mV upslope and 200mV down slope hysteresis for the body braking
comparator.
Lossless Average Inductor Current Sensing
Inductor current can be sensed by connecting a series resistor and a capacitor network in parallel with the inductor and
measuring the voltage across the capacitor, as shown in Figure 7. The equation of the sensing network is,
v C ( s ) = v L ( s )
1
1 + sR CS C CS
= i L ( s )
R L + sL
1 + sR CS C CS
Usually the resistor Rcs and capacitor Ccs are chosen, such that, the time constant of Rcs and Ccs equals the time
constant of the inductor, which is the inductance L over the inductor DCR R L . If the two time constants match, the
voltage across Ccs will be proportional to the current through L, and the sense circuit can be treated as if only a sense
resistor with the value of R L was used. The mismatch of the time constants does not affect the measurement of
inductor DC current, but affects the AC component of the inductor current.
v L
i L
Current
Sense Amp
L
R C
S
R L
C C
S
v C c
S
V O
C O
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 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
propagation delay, any added slope compensation, input voltage, and output voltage are all additional sources of peak-
to-average errors.
Page 13 of 39
February 12, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3504MPBF | 制造商:International Rectifier 功能描述:Control IC 32-Pin MLPQ Strip |
| IR3504MTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3504 AMD SVID CTRL IC 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 |
| IR3505 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505MPBF | 功能描述:IC XPHASE3 CONTROL 16-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase3™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3505MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 DDR VTT 7V 2A 3 Wire 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 |
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