AN604 datasheet(10/12 Pages) STMICROELECTRONICS

10 / 12 page

An application example

AN604

10/12

Doc ID 3607 Rev 3

From Equations (3), (4), (8) and (9) calculate VT0(Tjref1), VT0(Tjref2), RD(Tjref1), RD(Tjref2),

αVT0 and αRD. Calculated values of these parameters are summarized in Table 2.

From Equations 5 and 6 we can write VT0(Tj) and RD(Tj) as follow:

Equation 16

Equation 17

3.3

Conduction losses expression

From Equations 7, 15 and 16 the expression for maximum conduction losses is then:

Equation 18

Finally, let us plot the value of conduction losses in the diode as a function of the junction

temperature (Figure 8).

Figure 8.

Maximum conduction losses versus junction temperature

Table 2.

VT0, RD, αVT0, and αRD parameters

Tjref (°C)

VT0 (V)

RD (mΩ)

αVT0 (V·°C-1)

αRD (Ω·°C-1)

Tjref1 = 25

0.464

14.123

-951.358×10-6

12.839×10-6

Tjref2 = 125

0.368

15.406

-6

951.358

0.487

)

⋅

-6

-3

12.839

13.802

)

⋅

-3

COND(Max)

3.987

2.866

)

⋅

2.0W

2.2W

2.4W

2.6W

2.8W

3.0W

P(T )

COND(Max)

25°C 35°C 45°C 55°C 65°C 75°C 85°C 95°C 105°C 115°C 125°C

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