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| 型号： | IR3500VMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 27/34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
V I (max) ? 0 . 7 ? VCCL (min)
R VCCLDRV
< 10 mA
(18)
In the above equation, V I ( min) and V I ( max) is the minimum and maximum anticipated input voltage. If the
above condition is not satisfied there is a need to use a device with higher β min or Darlington configuration can
be used instead of a single NPN transistor.
Thermistor R THERM and Over Temperature Setting Resistors R HOTSET1 and R HOTSET2
The threshold voltage of VRHOT comparator is fixed at 1.6V, and a negative temperature coefficient (NTC)
thermistor R THERM is required to sense the temperature of the power stage. If we pre-select R THERM , the NTC
thermistor resistance at allowed maximum temperature T MAX is calculated from (19).
R TMAX = R THERM * EXP [ B THERM * (
1
T L _ MAX
?
1
T _ ROOM
)]
(19)
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 (20).
R HOTSET 1 =
( R TMAX + R HOTSET 2 ) * ( VCCL ? 1 . 6)
1 . 6
(20)
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
(21)
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 21(a) is usually enough. While for the applications using only ceramic capacitors and running at higher
frequency, type III compensation shown in Figure 21(b) is preferred.
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 21 - Voltage loop compensation network
Page 27 of 34
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 |
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| 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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