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| STD110NH02L_06 Datasheet, PDF (13/15 Pages) STMicroelectronics – N-channel 24V - 0.0044ohm - 80A - DPAK STripFET TM III Power MOSFET | |||
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STD110NH02L
Buck converter - power losses estimation
Table 7.
Power losses calculation
High side switching (SW1)
Low side switch (SW2)
Pconduction
R DS(on)SW1 * I2L *δ
R DS(on)SW2 * I2L * (1 â δ )
Pswitching
Vin
* (Qgsth(SW1)
+
Qgd(SW1) ) * f
*
IL
Ig
Pdiode
Recovery
(1)
Conductio
n
Not applicable
Not applicable
Zero Voltage Switching
Vin * Qrr(SW2) * f
Vf(SW2) * IL * t deadtime * f
Pgate(QG)
Qg(SW1) * Vgg * f
Qgls(SW2) * Vgg * f
PQoss
Vin * Qoss(SW1) * f
2
1. Dissipated by SW1 during turn-on
Vin * Qoss(SW2) * f
2
Table 8. Paramiters meaning
Parameter
Meaning
d
Qgsth
Qgls
Pconduction
Pswitching
Duty-cycle
Post threshold gate charge
Third quadrant gate charge
On state losses
On-off transition losses
Pdiode
Pgate
PQoss
Conduction and reverse recovery diode losses
Gate drive losses
Output capacitance losses
13/15
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