参数资料
型号: IR3084AMPBF
厂商: International Rectifier
文件页数: 32/45页
文件大小: 0K
描述: IC XPHASE CONTROL 28-MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 14mA
电源电压: 9.5 V ~ 16 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 28-MLPQ
供应商设备封装: 28-MLPQ(5x5)
包装: 剪切带 (CT)
IR3084A
VOLTAGE LOOP COMPENSATION
The adaptive voltage positioning is used in the computer applications to meet the load line requirements. 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.
Resistors R FB and R DRP are chosen according to Equations (15) and (16), and the selection of compensation
type depends on the capacitors used. For the applications using Electrolytic, Polymer or AL ? Polymer capacitors,
type II compensation shown in Figure 20 (a) is usually enough. While for the applications with only ceramic
capacitors, type III compensation shown in Figure 20 (b) is preferred.
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 20: Voltage Loop Compensation Networks
Type II Compensation
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, R CP and C CP can be determined by Equations (28) and (29).
R CP ?
C CP ?
(2 π * f C ) 2 * L E * C E * R FB * V PWMRMP
V O * 1 ? (2 π * f C * C E * R CE ) 2
10 * L E * C E
R CP
(28)
(29)
Where L E and R CE are the equivalent output inductance and ESR of the output capacitors, respectively. 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 32 of 45
3/3/2009
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