AN805 VISHAY [Vishay Siliconix], AN805 Datasheet - Page 7

• Manufacturer Part Number: AN805
• Description: PWM Optimized Power MOSFETs for Low-Voltage DC/DC Conversion
• Manufacturer: VISHAY [Vishay Siliconix]

Power loss due to crossover or switching transition loss can be calculated from the generic expression below
From this equation we can define the crossover losses generically for both resistive and clamped inductive loads.
Document Number: 70649
January 1997
P
S
f tts
1
V
0
ts
DS
1
I
D
dt
V
V
dd
dd
P =
P =
ts
R
R
2
L
L
Dissipation
Dissipation
V
0
ts
Vds (Id
DS
+
–
2
Power
Vds . Ids (ts
Power
Vds
Ids
1
I
D
Vds
. ts
Ids
dt
6
2
1
1
+ Id
+ ts
2
2
. ts
) f
2
) f
Clamped Inductive Cross over Losses
ts 1
Id
ts 1
1
Resistive Cross over Losses
V
dd
/ R
L
ts 2
ts 2
ts 2
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