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| 型号： | IR3500MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 33/47页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROLLER 32-MLPQ |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 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 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3500MTRPBFDKR |
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IR3500
R TMAX = R THERM * EXP [ B THERM * (
1
T L _ MAX
?
1
T _ ROOM
)]
(22)
Select the series resistor R HOTSET2 to linearize the NTC thermistor, which has non-linear characteristics in the
operational temperature range. Then calculate R HOTSET1 corresponding to the allowed maximum temperature
TMAX from (23).
R HOTSET 1 =
( R TMAX + R HOTSET 2 ) * ( VCCL ? 1 . 6)
1 . 6
(23)
VOLTAGE LOOP COMPENSATION
The adaptive voltage positioning (AVP) is usually adopted in the computer applications to improve the transient
response and reduce the power loss at heavy load. Like current mode control, the adaptive voltage positioning
loop introduces an extra zero to the voltage loop and splits the double poles of the power stage, which makes the
voltage loop compensation much easier.
Adaptive voltage positioning lowers the converter voltage by R O *I O, where R O is the required output impedance of
the converter. Pre-select feedback resistor R FB, and calculate the droop resistor RDRP,
R DRP =
R FB ? R L _ MAX * G CS
n ? R O
(25)
The selection of compensation types depends on the output capacitors used in the converter. For applications
using Electrolytic, Polymer or AL-Polymer capacitors and running at lower frequency, type II compensation shown
in Figure 22(a) is usually enough. While for the applications using only ceramic capacitors and running at higher
frequency, type III compensation shown in Figure 22(b) is preferred.
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.
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 22 - Voltage loop compensation network
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 (26) and (27), where L E and
C E are the equivalent inductance of output inductors and the equivalent capacitance of output capacitors
respectively.
Page 33 of 47
May 18, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3500V | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3500V AMD SVID CTRL IC 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 |
| 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 |
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