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| 型号： | IR3504MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 33/42页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE3 SVID 32-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： | 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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IR3504
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 (25) and (26), 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
(25)
θ C 1 = 90 ? A tan( 0 . 5 ) ?
180
π
(26)
Choose the desired crossover frequency fc around fc1 estimated by (25) 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 (27), and determine C FB and C DRP from
(28) and (29).
R FB 1 =
1
2
R FB
to
R FB 1 =
2
3
R FB
(27)
C FB =
1
4 π ? f C ? R FB 1
(28)
C DRP =
( R FB + R FB 1 ) ? C FB
R DRP
(29)
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 (30) and (31).
R CP =
C CP =
( 2 π ? f C ) 2 ? L E ? C E ? R FB ? 5
V I
10 ? L E ? C E
R CP
(30)
(31)
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 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 (32), and
determine the component values based on (33) to (37),
K = tan[ ? ( C + 1 . 5 )]
4 180
π θ
(32)
R CP = R FB ?
( 2 π ? L E ? C E ? f C ) 2 ? 5
V I ? K
(33)
Page 33
C CP =
C CP 1 =
K
2 π ? f C ? R CP
1
2 π ? f C ? K ? R CP
(34)
(35)
July 28, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3505 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505MPBF | 功能描述:IC XPHASE3 CONTROL 16-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase3™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3505MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 DDR VTT 7V 2A 3 Wire 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 |
| IR3505Z | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505ZMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
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