AN2344 datasheet(21/27 Pages) STMICROELECTRONICS

21 / 27 page

AN2344

Datasheet avalanche ratings

21/27

Figure 17.

STP11NM60FP rectangular pulse switching approximation

By using the superimposition principle (see Figure 18.) the maximum temperature at

avalanche onset is expressed as:

Equation 26

then,

Equation 27

thus,

Equation 28

The result, in this case, confirms the application of the simplified equation (see Equation

18).

The STP11NM60FP working within the datasheet ratings, IAR and TJ(max). Different ambient

temperatures or some heat sinking faults or, even some variation of other components in the

board can bring the STP11NM60FP to operating points (IAR and TJ(max)) beyond the

absolute maximum ratings and consequently risk the Power MOSFET’s failure.

jcmaxav

∆

Zth

jc t4

()

•

AVE Rthjc

Zth

jc t1

()

–

()

Zth

jc t3

() Zth

jc tD3

()

–

[]

•

Zth

jc t2

() Zth

jc t3

()

–

[]

•

Zth

jc t1

() Zth

jc tD1

()

–

[]

•

jcmaxav

∆

Zth

jc 61ns

()

•

AVE Rthjc

Zth

jc 2.57us

()

–

() P

Zth

jc 125ns

() Zth

jc 82ns

()

–

[]

•

Zth

jc 1.48us

() Zth

jc 133ns

()

–

[]

•

Zth

jc 2.57us

() Zth

jc 2.54us

()

–

[]

•

47.28

° C

47.28

° C70° C117° C

≈

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