参数资料
型号: IR3081AMPBF
厂商: International Rectifier
文件页数: 24/39页
文件大小: 0K
描述: IC CTRLR XPHASE VR10.0 28MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 11mA
电源电压: 9.5 V ~ 14 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)
IR3081A
θ C 1 = 90 ? A tan( 0 . 5 ) ?
180
π
(28)
Choose the desired crossover frequency fc around fc1 estimated by Equation (27) or choose fc between 1/10 and
1/5 of the switching frequency per phase, and select the components to ensure the slope of close loop gain is -20dB
/Dec around the crossover frequency. Choose resistor R FB1 according to Equation (29), and determine C FB and
R DRP from Equations (30) and (31).
R FB 1 =
1
2
R FB
to
R FB 1 =
2
3
R FB
(29)
C FB =
1
4 π ? f C ? R FB 1
(30)
C DRP =
( R FB + R FB 1 ) ? C FB
R DRP
(31)
R CP and C CP have limited effect on the crossover frequency, and are used only to fine tune the crossover frequency
and transient load response. Determine R CP and C CP from Equations (32) and (33).
R CP =
C CP =
( 2 π ? f C ) 2 ? L E ? C E ? R FB ? V PWMRMP
V O
10 ? L E ? C E
R CP
(32)
(33)
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.
Type III Compensation for Non-AVP Applications
Resistor R FB is chosen according to Equations (13), and resistor R DRP and capacitor C DRP are not needed. Choose
the crossover frequency fc between 1/10 and 1/5 of the switching frequency per phase and select the desired phase
margin θ c. Calculate K factor from Equation (34), and determine the component values based on Equations (35) to
(39),
π θ
K = tan[ ? ( C + 1 . 5 )]
4 180
(34)
R CP = R FB ?
( 2 π ? L E ? C E ? f C ) 2 ? V PWMRMP
V O ? K
(35)
Page 24 of 39
C CP =
C CP 1 =
C FB =
R FB 1 =
K
2 π ? f C ? R CP
1
2 π ? f C ? K ? R CP
K
2 π ? f C ? R FB
1
2 π ? f C ? K ? C FB
(36)
(37)
(38)
(39)
1/31 /05
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