L6207 datasheet(30/53 Pages) STMICROELECTRONICS

30 / 53 page

AN1762 APPLICATION NOTE

30/53

Figure 32. Power Dissipation formulae and results.

Result

PowerDMOS

Commutation

Time

Tcom =

9.60E-08

[s]

Vs / (250V/

µs)

Rise Time

Trise =

4.03E-04

[s]

Fall Time

Tfall =

3.16E-04

[s]

NORMAL Mode

HALF or WAVE

Mode

Duty Cycle

D =

6.25E-01

Vb / Vs

Sync. Slow Decay

Switching

Frequency

fSW =

2.50E+04

[Hz]

(1-D) / tOFF

Current Ripple

∆I = 2.85E-02 [A]

(Vs - Vb)*D / (Lm* fSW)

Period

T =

2.00E-03

[s]

2 / fCK

4 / fCK

2 / fCK

NORMAL Mode

HALF Mode

WAVE Mode

Load Time

Tload =

5.97E-04

[s]

T-Trise-Tfall

(3/4)T-rise

(T/2)-Trise

NORMAL Mode

HALF Mode

WAVE Mode

Average Cur-

rent during

Load Time

I =

9.86E-01

[A]

r.m.s. Current

during Load

Time

Irms =

9.86E-01

[A]

Rise Time

Dissipating

Energy

Erise =

1.50E-04

[J]

Fall Time

Dissipating

Energy

Efall =

3.62E-04

[J]

MORMAL Mode

HALF or WAVE

Mode

Load Time

Diss. Energy

Eload =

6.50E-05

[J]

2Ron · Irms2 · Tload

Sync. Slow Decay

Ipk Rm

2 Ipk Ron

Ipk Rs

⋅

–

⋅

–

⋅

–

()

---------------------------------------------------------------------------------------------------------------

2Ron

----------------------------------------------

⋅

–

Ipk Rm

Ipk Ron

Ipk Rs

⋅

⋅⋅

⋅

()

-------------------------------------------------------------------------------------------------------------

2 Ron

⋅

()

-------------------------------------------------------

⋅

–

2 Vd

⋅

–

()

Ipk Rm

Ipk Rs

2 Vd

⋅

–

⋅

()

-------------------------------------------------------------------------------------------

()

----------------------------

⋅

–

Ipk

∆

-----

–

Ipk

∆

–

()

∆

-------

⋅

2Ron Ipk

Trise

---------------

⋅⋅

2Ron Ipk

Tfall

-------------

⋅⋅

2V d Tfall

–

2Vd

⋅

()

--------------------------------------

Ipk Rm

Ipk Rs

V s

2 V d

⋅

–

⋅

()

– fal l

----------------

()

⋅

exp

–

()

---------------------------------------------------------------------------------

⋅⋅

⋅

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