STD70N03L Datasheet, PDF (10/16 Pages) STMicroelectronics – N-channel 30V - 0.0059ohm - 70A - DPAK / IPAK STripFET TM III Power MOSFET

Power losses estimation
High side switch (SW1)
P_conduction
R_DS(on) • I_L2 • δ
STD70N03L - STD70N03L-1
Low side switch (SW2)
R_DS(on) • I_L2 • (1 – δ)
P_switching
V_in
•
(Q_gsth(SW1)
+
Q_gd(SW1))
•
f
•
I_--L-
I_g
Zero voltage switching
P_diode
Recovery
Conduction
P_gate(Qg)
P_Qoss
Parameter
d
Q_gsth
Q_gls
Pconduction
Pswitching
Pdiode
Pgate
P_Qoss
Not applicable
Not applicable
Q_g(SW1) • V_gg • f
V_-----i-n----•_-----Q_{-----o---s---s--(--S----W----1---)---}•_-----f
2
1_{Vin • Qrr(SW2) • f}
V_f(SW2) • I_L • t_deadtime • f
Q_gls(SW2) • V_gg • f
V_-----i-n----•_-----Q_{-----o---s---s--(--S----W----2---)---}•_-----f
2
Meaning
Duty-cycle
Post threshold gate charge
Third quadrant gate charge
On state losses
On-off transition losses
Conduction and reverse recovery diode losses
Gate driver losses
Output capacitance losses
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