参数资料
型号: IR3521MTRPBF
厂商: International Rectifier
文件页数: 38/45页
文件大小: 0K
描述: IC CTRL XPHASE3 SVID 32-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: 32-VFQFN 裸露焊盘
供应商设备封装: 32-MLPQ(5x5)
包装: 带卷 (TR)
IR3521
VDAC Slew Rate Programming Capacitor C VDAC and Resistor R VDAC
C VDAC ?
I SINK
SR DOWN
?
45 . 2 ? 10 ? 6
3 . 2 * 10 3
? 14 . 1 nF , Choose C VDAC =22nF
R VDAC ? 0 . 5 ?
3 . 2 ? 10 ? 15
C VDAC 2
? 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
table can get the bias current of OCSET pin (I OCSET ) is 26uA with R OSC =23.2 k ? . The total current sense
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 =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, 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 ? 3
26 * 10 ? 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 38
V3.03
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