Where,
T
oni
is the Turn on loss of the i
th
switching cycle, in watt.
T
OFFi
is the Turn off loss of the i
th
switching cycle, in watt.
fswi is the Switching frequency of the ith switching cycle, in Hz.
(T
off
-Stop
i
) is the stop point of T
off
region of the i
th
switching cycle, in time unit.
(T
on
-Stop
i
) is the stop point of T
on
region of the i
th
switching cycle, in time unit.
(T
on
-Start
i
) is the start point of a power T
on
region of the i
th
switching cycle.
(T
off
-Start
i
) is the start point of TOffi region, in time unit Vds - Voltage drain current, in Volts.
Ids is the drain current, in Amps.
â–
Energy Loss Computation
Energy loss computation for T
on
and T
off
are calculated using the following equation:
Where:
T
Eoni
is the i
th
switching cycle turn on energy loss in joule.
T
Eoffi
is the i
th
switching cycle turn off energy loss in joule.
â–
Computation of Conduction
Conduction is computed as RDS(on) value for the MOSFET is used to calculate total loss in the application. To measure
conduction loss and energy in a MOSFET, using the following equation:
Where:
R
DS
(on) is the Dynamic resistance, in Ω.
Cond
i
is the Conduction Loss in Watt, Cond
Ei
is the Conduction Energy Loss in Joule.
Cond
i
is the i
th
switching cycle conduction loss in watt. Cond
Ei
is the i
th
switching cycle conduction energy in joules.
f
swi
is the i
th
switching cycle frequency, in Hz.
I is the Cycle number.
Measurement algorithms
MSO54, MSO56, MSO58, MSO58LP, MSO64 Help 469
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