AN604

Diode forward characteristics

Doc ID 3607 Rev 3

3/12

1

Diode forward characteristics

1.1

Junction temperature dependence

For two different junction temperatures, the current versus forward voltage curves cross at a

the temperature coefficient

higher, the temperature coefficient becomes positive. This behavior is shown in Figure 2.

0, the forward voltage and the conduction losses decrease when the junction temperature

increases.

Figure 2.

1.2

Equation 1

Equation 2

Equation 3

Equation 4

α

V

F

I

F

α

T

T

j1

α

I

c

0

1

F

j

D

j

T0

j

1

F

F

I

)

(T

R

)

(T

V

)

T

,

(I

V

⋅

+

=

2

F

j

D

j

T0

j

2

F

F

I

)

(T

R

)

(T

V

)

T

,

(I

V

⋅

+

=

1

F

2

F

j

1

F

F

j

2

F

F

j

D

I

I

)

T

,

(I

V

)

T

,

(I

V

)

(T

R

−

−

=

1

F

2

F

1

F

j

2

F

F

2

F

j

1

F

F

j

T0

I

I

I

)

T

,

(I

V

I

)

T

,

(I

V

)

(T

V

−

⋅

−

⋅

=