参数资料
型号: IR3093MTRPBF
厂商: International Rectifier
文件页数: 31/39页
文件大小: 0K
描述: IC CTLR 3PHASE VR10 48-MLQP
标准包装: 3,000
应用: VID 电压编程器
电源电压: 7.4 V ~ 21 V
电流 - 电源: 38mA
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 48-MLPQ
供应商设备封装: 48-MLPQ(7x7)
包装: 带卷 (TR)
IR3093PbF
MathCAD file to estimate the power dissipation of the IC
This Mathcad file step by step shows how to estimate the power dissipation of the IC.
Initial Conditions:
No.of Phases: n   3
IC Supply Voltage: Vcc   12 ( V ) , IC Supply Current(quiescent):
Biasout Voltage: Vbias   7.5 ( V )
Switching Frequency per phase: fsw   300 ( kHz )
Thermal Impedance of IC: T JA   27 (oC/W)
Total High side Driver VCCH supply current(quiescent): Iqh   5 ? n ( mA )
Total Low side Driver VCCL supply Current(quiescent): Iql   5 ? n ( mA )
Icq   38 ( mA )
The data from the selected MOSFETs:
ControI FET IR6623, Number of Control FET per phase:
Control FET total gate charge: Qgc   16 ( nC )
Synchronous FET IR6620, Number of sync. FET per phase:
Sync FET total gate charge: Qgs   45 ( nC )
nc   1
ns   1
Power Dissipation:
The IC will have less power dissipation if using external gate driver supply. For the worst case estimation,
assuming using the bias regulator for all the gate drive supply voltage.
1. Quiescent Power dissipation
Total Quiescent Power Dissipation:
Pq   ( Icq   Iqh   Iql ) ? Vcc ? 10
3
Pq
0.816 ( W )
Pdrv   Vbias ? fsw ? 10 ? n ? a? ( nc ? Qgc   ns ? Qgs ) ? 10 9 o
Ig   fsw ? 10 ? n ? ( nc ? Qgc   ns ? Qgs ) ? 10
Where the
term in the equation gives the total
2. The Power Loss to drive the gate of the MOSFETs
With the assumption of the low MOSFET gate resistances, most gate drive losses are dissipated in
the driver circuit.
3
Pdrv 0.412 ( W )
3 9
average bias current required to drive all the MOSFETs.
3. The bias regulator Power Loss to supply driving the MOSFETs
Preg   ( Vcc   Vbias ) ? Ig
Preg
0.247
( W )
4. Total Power Dissipation of the IC:
Pdiss   Pq   Pdrv   Preg
And the total Junction temperature rising is:
Page 31 of 39
Pdiss 1.475 ( W )
Pdiss ? T JA 39.82 (oC)
09/08/05
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