参数资料
型号: IR3094MPBF
厂商: International Rectifier
文件页数: 23/29页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 48MLPQ
标准包装: 200
PWM 型: 电压模式
输出数: 3
频率 - 最大: 540kHz
占空比: 100%
电源电压: 8 V ~ 16 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 150°C
封装/外壳: 48-MLPQ
包装: 剪切带 (CT)
IR3094PBF
MathCAD file to estimate the power dissipation of the IC
The full featured Control IC IR3094 contain both Control and 3 phase Gate Drive functions. It also has the
adjustable voltage bias regulator inside to provide MOSFET Drive Voltage. For the thermal consideration,
this Mathcad file step by step shows how to estimate the power dissipation of IR3094 .
Initial Conditions:
No.of Phases: n   3
IC Supply Voltage: Vcc   12 ( V ) , IC Supply Current(quiescent):
Total High side Driver VCCH supply current(quiescent): Iqh   5 ? n ( mA )
Total Low side Driver VCCL supply Current(quiescent): Iql   5 ? n ( mA )
Biasout Voltage: Vbias   7.5 ( V )
Switching Frequency per phase: fsw   450 ( kHz )
Thermal Impedance of IC: T JA   27 ( o C/W)
Icq   35 ( mA )
The data from the selected MOSFETs:
ControI FET IR6637, Number of Control FET per phase:
Control FET total gate charge: Qgc   15 ( nC )
Synchronous FET IR6612, 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
  3
Total Quiescent Power Dissipation:
Pq   ( Icq   Iqh   Iql ) ? Vcc ? 10
Pq
( W )
Pdrv   Vbias ? fsw ? 10 ? n ? a? ( nc ? Qgc   ns ? Qgs ) ? 10   9 o
Pdrv
( W )
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
Where the Ig   fsw ? 10 3 ? n ? ( nc ? Qgc   ns ? Qgs ) ? 10   9 term in the equation gives the total
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
( W )
4. Total Power Dissipation of the IC:
Pdiss   Pq   Pdrv   Preg
And the total Junction temperature rising is:
Page 23 of 29
Pdiss
Pdiss ? T JA
( W )
( o C)
09/26/05
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