参数资料
| 型号： | IR3081MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 23/40页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 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) |
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IR3081PBF
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 * R C ) 2
10 ? L E ? C E
R CP
(27)
(28)
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 AVP Applications
Determine the compensation at no load, the worst case condition. Assume the time constant of the resistor and
capacitor across the output inductors matches that of the inductor, the crossover frequency and phase margin of the
voltage loop can be estimated by Equations (29) and (30), where R LE is the equivalent resistance of inductor DCR.
f C 1 =
R DRP
2 π * C E ? G CS * R FB ? R LE
(29)
θ C 1 = 90 ? A tan( 0 . 5 ) ?
180
π
(30)
Choose the desired crossover frequency fc around fc1 estimated by Equation (29) 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 (31), and determine C FB and
R DRP from Equations (32) and (33).
R FB 1 =
1
2
R FB
to
R FB 1 =
2
3
R FB
(31)
C FB =
1
4 π ? f C ? R FB 1
(32)
C DRP =
( R FB + R FB 1 ) ? C FB
R DRP
(33)
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 (34) and (35).
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
(34)
(35)
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 (15), 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 (36), and determine the component values based on Equations (37) to
π θ
(41),
Page 23 of 40
K = tan[ ? ( C + 1 . 5 )]
4 180
(36)
10/01 /04
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