参数资料
型号: IR3523MTRPBF
厂商: International Rectifier
文件页数: 32/37页
文件大小: 0K
描述: IC XPHASE3 CTLR VR11.1 40-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: 40-MLPQ
供应商设备封装: 40-MLPQ(6x6)
包装: 带卷 (TR)
IR3523
The over current set resistor (Rocset) can be calculated as follows:
R OCSET 1 = [
I LIMIT
n
? R L ? ( 1 + K P ) + V CS _ TOFST ] ? G CS / I OCSET ,
= (
42
1
? 0 . 52 * 10 ? 3 ? 1 . 156 ) * 32 . 5 /( 38 * 10 ? 6 ) = 21 . 6 k ? ,
R OCSET 2 = [
I LIMIT
n
? R L ? ( 1 + K P ) + V CS _ TOFST ] ? G CS / I OCSET ,
= (
125
3
? 0 . 47 * 10 ? 3 ? 1 . 23 ) * 32 . 5 /( 38 * 10 ? 6 ) = 20 . 6 k ? .
VCCL Programming Resistor R VCCLFB1 and R VCCLFB2
Choose VCCL=7V to maximize the converter efficiency. Pre-select R VCCLFB1 =20k , and calculate R VCCLFB2.
R VCCLFB 2 =
R VCCLFB 1 * 1. 23
VCCL ? 1 . 23
=
20 * 10 3 * 1.23
7 ? 1 . 23
= 4 . 26 k ?
No Load Offset Setting Resistor RFB11 and Adaptive Voltage Positioning Resistor RDRP11 for
Output1
Given the desired offset voltage (V O_NLOFST ) and calculating the FB1 sink current using the equation in the
ELECTRICAL CHARACTERISTICS Table, the effective offset resistor value R FB11 can be determined by:
R FB 11 =
V O _ NLOFST
I FB 1
=
20 * 10 ? 3
38 * 10 ? 6
= 526 ? = 523 ? (Actual Value).
Adaptive voltage positioning lowers the converter voltage by R O *I O, where R O is the required output impedance of
the converter. RDRP11 is calculated with the following equation:
R DRP 11 =
R FB 11 ? R L _ ROOM * G CS
n ? R O
=
523 * 0 . 47 * 10 ? 3 * 32. 5
1 * 6 * 10 ? 3
= 1 . 33 K ? .
In the case of thermal compensation is required, use equation (14) to (17) to select the R FB network resistors.
Page 32 of 37
June 20, 2008
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