参数资料
型号: IR3514MTRPBF
厂商: International Rectifier
文件页数: 39/46页
文件大小: 0K
描述: IC XPHASE3 CONTROL HYBRD 40-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
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: 标准包装
产品目录页面: 1383 (CN2011-ZH PDF)
其它名称: IR3514MTRPBFDKR
I SINK 45 . 2   10 6
3 . 2 * 10 3
3 . 2   10
0 . 5  
C VDAC 2
table can get the bias current of OCSET pin (I OCSET ) is 26uA with R OSC =23.2 k ?  7KH WRWDO FXUUHQW VHQVH
IR3514
VDAC Slew Rate Programming Capacitor C VDAC and Resistor R VDAC
C VDAC 14 . 1 nF , Choose C VDAC =22nF
SR DOWN
15
R VDAC 7 . 1 Ohm
Over Current Setting Resistor R OCSET
The output1 over current limit is 115A and the output2 over current limit is 25A. From the electrical characteristics
amplifier input offset voltage is around 0mV, Calculate constant K P, the ratio of inductor peak current over average
current in each phase,
K P 1
( V I   V O )   V O /( L   V I   f SW   2 )
I LIMIT / n
(12   1. 2)   1. 2 /(120 * 10 9   12   520 * 10 3   2 )
115 / 5
0 . 38
K P 2
(12   1. 2)   1 .2 /( 220 * 10 9   12   520 * 10 3   2)
25
0 . 19
R OCSET 1 [ LIMIT   R L   ( 1   K P )   V CS _ TOFST ]   G CS / I OCSET
I
n
(
115
5
  0 . 52 * 10 3   1 . 38 ) * 34 /( 26 * 10 6 )
21 . 6 k :
R OCSET 2 [ LIMIT   R L   ( 1   K P )   V CS _ TOFST ]   G CS / I OCSET
I
n
(
25
1
  0 . 47 * 10
3
  1 . 19 ) * 34 /( 26 * 10
6
) 18 . 4 k :
VCCL Programming Resistor R VCCLFB1 and R VCCLFB2
Choose VCCL=7V to maximize the converter efficiency. Pre-select R VCCLFB1   N   DQG FDOFXODWH 5 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, RFB13, RTHERM1 and Adaptive Voltage Positioning Resistor
RDRP11 for Output1
Define R FB_R is the effective offset resistor at room temperature equals to R FB11 //(R FB13 +R THERM1 ). Given the
offset voltage V O_NLOFST above the DAC voltage, calculate the sink current from the FB1 pin I FB1 = 26uA using
the equation in the ELECTRICAL CHARACTERISTICS Table, then the effective offset resistor value R FB_R 1 can
be determined by:
R FB _ R 1
V O _ NLOFST
I FB 1
15 * 10
26 * 10
3
6
577 Ohm
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,
Page 39 of 46
10/30/2007
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