AN604

Conduction losses: basic equations

Doc ID 3607 Rev 3

7/12

Figure 4.

Average and rms currents of commonly observed waveforms

Square waveform

t

0

T

sw

Trapezoidal waveform

T

sw

sw

t

0

δ

δ

·

=

·

=

Max

RMS

F

Max

AV

F

I

I

I

I

)

(

)

(

δ

δ

·

×

+

+

=

·

+

=

3

I

I

I

I

I

2

I

I

I

Min

Max

2

Min

2

Max

RMS

F

Min

Max

AV

F

)

(

)

(

t

0

sw

2

I

I

I

2

I

Max

RMS

F

Max

AV

F

δ

δ

π

·

=

·

=

)

(

)

(

Half period sinusoidal waveform

t

0

T

sw

sw

Triangular waveform

3

I

I

2

I

I

Max

RMS

F

Max

AV

F

δ

δ

·

=

·

=

)

(

)

(