参数资料
型号: IR3502AMTRPBF
厂商: International Rectifier
文件页数: 32/38页
文件大小: 0K
描述: IC XPHASE CTRL VR11.0/1 32-MLPQ
标准包装: 1
系列: XPhase3™
应用: 处理器
电流 - 电源: 8mA
电源电压: 8 V ~ 16 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: IR3502AMTRPBFDKR
? ? 7 . 5 k ?
? ? ? 1 ?
R DRP ?
?
? ?
IR3502A
Droop Resistor
Based on the above calculation R DRP can be selected to obtain specific output impedance.
Pre-select R FB =1 k ? and using R o =0.8 m ? , G cs =33.5 along with the converter parameters can be plugged into (24) to
find out R DRP .
1 1 k ? ? 33. 5 ? 0. 35 m ? ? 5. 618 k ?
3 0 . 8 m ? ? 5 ? ? 1 k ?
Over Current Threshold
The OCP is fixed at 1.17 V above the VDAC voltage. Therefore, it can be determined as follows
? ? ?
? 1 ? 0 . 35 m ? 33 . 5 ? ?
? ?
I OCP ?
? 3 ? 5 ? ?
? ? ? 1 ?
1 . 17
(8.457 k ) II (8.837 k ? 10 k ) ? ?
1 k ? ?
? 182 A
VCCL Drive Resistor R VCCLDRV
The maximum drive current for the linear regulator is dependent on the type of MosFET used. For this
example, it’s assumed that IR6622 and IRF6628 are used as the control and sync FET respectively.
I drive _ avg ? ? ( 30 . 3 n ? 11 n ) ? 700 k ? 10 mA ? ? 5 ? 195 mA
The minimum input voltage is assumed to be 10.5 V and VCCL is fixed at 6.5V for this design.
R VCCLDRV ?
10 .5 V ? 0 . 7 V ? 6 . 5 V
195 mA / 30
? 700 ?
Choose a transistor with β (min) of 50. The maximum input voltage is assumed 13.5 V,
13 . 5 V ? 0 . 7 ? 6 . 5
700 ?
? 9 mA ? 10 mA
Thermistor R HOTSET3 and Over Temperature Setting Resistors R HOTSET1 and R HOTSET2
Choose NTC thermistor R HOTSET3 =2.2k ? , which has a constant of B HOTSET3 =3520, and the NTC thermistor
resistance at the allowed maximum temperature T MAX is,
R TMAX ? R HOTSET 3 * EXP [ B HOTSET 3 * (
1
T L _ MAX
?
1
T _ ROOM
)] ? 2 . 2 * 10 3 * EXP [ 3520 * (
1
273 ? 115
?
1
273 ? 25
)] ? 142 ?
Select R HOTSET2 = 931 ? to linearize the NTC, which has non-linear characteristics in the operational temperature
range. Then calculate R HOTSET1 corresponding to the allowed maximum temperature TMAX.
R HOTSET 1 ?
( R TMAX ? R HOTSET 2 ) * ( VCCL ? 1 .6 )
1 . 6
?
(142 ? 931) * ( 7 ? 1 .6 )
1 . 6
? 3 . 63 k ? , choose R HOTSET1 =3.65k ? .
Page 32 of 38
December 17, 2009
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