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| STD50N03L Datasheet, PDF (10/16 Pages) STMicroelectronics – N-CHANNEL 30V - 9.2mohm - 40A - DPAK/IPAK STripFET TM III Power MOSFET | |||
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Buck converter
Table 7.
Power losses
High side switching (SW1)
Pconduction
R DS(on)SW1 * I2L *δ
STD50N03L - STD50N03L-1
Low side switch (SW2)
R
DS(on)SW2
*
I
2
L
*
(1
â
δ
)
Pswitching
Vin
* (Qgsth(SW1)
+
Qgd(SW1) ) * f
*
IL
Ig
Pdiode
Recovery
(1)
Conduction
Not applicable
Not applicable
Pgate(QG)
Qg(SW1) * Vgg * f
Zero Voltage Switching
Vin * Qrr(SW2) * f
Vf(SW2) * IL * t deadtime * f
Qgls(SW2) * Vgg * f
PQoss
Vin * Qoss(SW1) * f
2
1. Dissipated by SW1 during turn-on
Table 8. Paramiters meaning
Parameter
Meaning
d
Qgsth
Qgls
Pconduction
Pswitching
Pdiode
Pgate
PQoss
Duty-cycle
Post threshold gate charge
Third quadrant gate charge
On state losses
On-off transition losses
Conduction and reverse recovery diode losses
Gate drive losses
Output capacitance losses
Vin * Qoss(SW2) * f
2
10/16
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