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| 型号： | IR3522MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 25/32页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE3 DDR/VVT 32-MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 7mA |
| 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： | 带卷 (TR) |
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IR3522
IR3506 EXTERNAL COMPONENTS
Inductor Current Sensing Capacitor C CS and Resistor R CS
The DC resistance of the inductor is utilized to sense the inductor current. Usually the resistor R CS and capacitor
C CS in parallel with the inductor are chosen to match the time constant of the inductor, and therefore the voltage
across the capacitor C CS represents the inductor current. If the two time constants are not the same, the AC
component of the capacitor voltage is different from that of the real inductor current. The time constant mismatch
does not affect the average current sharing among the multiple phases, but affect the current signal ISHARE as
well as the output voltage during the load current transient if adaptive voltage positioning is adopted.
Measure the inductance L and the inductor DC resistance R L . Pre-select the capacitor C CS and calculate R CS as
follows.
R CS =
L R L
C CS
(11)
Bootstrap Capacitor C BST
Depending on the duty cycle and gate drive current of the phase IC, a capacitor in the range of 0.1uF to 1uF is
needed for the bootstrap circuit.
Decoupling Capacitors for Phase IC
0.1uF-1uF decoupling capacitors are required at VCC and VCCL pins of phase ICs.
Type III Compensation
Choose the crossover frequency fc between 1/10 and 1/5 of the switching frequency per phase, the desired
phase margin θ c and Rfb1 (see Figure 12). Determine the component values based on the equations below. wc is
2* π *fc (the crossover angular frequency), Le is the equivalent inductance of the converter, C is the output
capacitance, Rst is the total equivalent resistance in series with the inductor, Rc is the output capacitance ESR
and R is the load resistance.
Ccp =
Rcp =
Cfb =
1
K ? Rfb 1
1
Ccp ? wz 1
1
wz 2 ? Rfb 1
(12)
(13)
(14)
Page 25
Ccp 1 =
Rfb 2 =
1
wp 2 ? Rcp
1
wp 1 ? Cfb
(15)
(16)
V3.01
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| IR3529MTRPBF | IC CTRL XPHASE CPU/ASIC 20-MLPQ |
| IR3550MTRPBF | IC DRIVER GATE 60A PQFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3523 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DUAL OUTPUT CONTROL IC |
| IR3523MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DUAL OUTPUT CONTROL IC |
| IR3523MTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3523 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 |
| IR3527 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DUAL PHASE IC |
| IR3527MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DUAL PHASE IC |
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