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| 型号： | IR3500VMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 28/34页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CTLR VR11.1 32-MLPQ |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 6.5mA |
| 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： | 标准包装 |
| 其它名称： | IR3500VMTRPBFDKR |
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IR3500V
For applications where AVP is not required, the compensation is the same as for the regular voltage mode
control. For converters using Polymer, AL-Polymer, and ceramic capacitors, which have much higher ESR zero
frequency, type III compensation is required as shown in Figure 22(b) with R DRP and C DRP removed.
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 (23), 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
(22)
(23)
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 (24) and (25), 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
(24)
θ C 1 = 90 ? A tan( 0 . 5 ) ?
180
π
(25)
Choose the desired crossover frequency fc around fc1 estimated by (24) 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
per decade around the crossover frequency. Choose resistor R FB1 according to (26), and determine C FB and
C DRP from (27) and (28).
R FB 1 =
1
2
R FB
to
R FB 1 =
2
3
R FB
(26)
C FB =
1
4 π ? f C ? R FB 1
(27)
C DRP =
( R FB + R FB 1 ) ? C FB
R DRP
(28)
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 (29) and (30).
R CP =
Page 28 of 34
( 2 π ? f C ) 2 ? L E ? C E ? R FB ? 5
V I
(29)
July 28, 2008
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相关代理商/技术参数 |
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|---|---|
| IR3502 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
| IR3502_09 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
| IR3502A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
| IR3502AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
| IR3502AMTRPBF | 功能描述:IC XPHASE CTRL VR11.0/1 32-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 |
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