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| 型号： | IR3523MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 28/37页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CTLR VR11.1 40-MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 10mA |
| 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： | 40-MLPQ |
| 供应商设备封装： | 40-MLPQ（6x6） |
| 包装： | 带卷 (TR) |
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IR3523
VOLTAGE LOOP COMPENSATION
The adaptive voltage positioning (AVP) is usually adopted in the computer applications to improve the transient
response and reduce the power loss at heavy load. Like current mode control, the adaptive voltage positioning
loop introduces extra zero to the voltage loop and splits the double poles of the power stage, which make the
voltage loop compensation much easier.
Adaptive voltage positioning lowers the converter voltage by R O *I O, where R O is the required output impedance of
the converter.
The selection of compensation types depends on the output capacitors used in the converter. For the applications
using Electrolytic, Polymer or AL-Polymer capacitors and running at lower frequency, type II compensation shown
in Figure (a) is usually enough. While for the applications using only ceramic capacitors and running at higher
frequency, type III compensation shown in Figure 21(b) is preferred.
For applications where AVP is not required, the compensation is the same as for the regular voltage mode
control. For converter using Polymer, AL-Polymer, and ceramic capacitors, which have much higher ESR zero
frequency, type III compensation is required as shown in Figure 21(b) with R DRP and C DRP removed.
CCP1
CCP1
VO+
RFB
RCP
CCP
RCP
CCP
RFB1
CFB
FB
-
VO+
RFB
FB
-
EAOUT
EAOUT
VDRP
RDRP
VDAC
+
EAOUT
EAOUT
VDRP
RDRP
VDAC
+
CDRP
(a) Type II compensation
(b) Type III compensation
Figure 17 - Voltage loop compensation network
Type II Compensation for AVP Applications
Determine the compensation at no load, the worst case condition. Choose the crossover frequency fc between
1/10 and 1/5 of the switching frequency per phase. Assume the time constant of the resistor and capacitor across
the output inductors matches that of the inductor, and determine R CP and C CP from (23) and (24), where L E and
C E are the equivalent inductance of output inductors and the equivalent capacitance of output capacitors
respectively.
R CP =
C CP =
( 2 π ? f C ) 2 ? L E ? C E ? R FB ? 5
V I * 1 + ( 2 π * f C * C * R C ) 2
10 ? L E ? C E
R CP
(23)
(24)
C CP1 is optional and may be needed in some applications to reduce the jitter caused by the high frequency noise.
A ceramic capacitor between 10pF and 220pF is usually enough.
Page 28 of 37
June 20, 2008
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相关代理商/技术参数 |
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|---|---|
| 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 |
| IR3527MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 Dual Phase 7V 1.3A PMIC 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 |
| IR3529 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3529MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
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