AN4402 datasheet(12/39 Pages) STMICROELECTRONICS

12 / 39 page

Demagnetization energy

AN4402

12/39

DocID025557 Rev 1

Equation 3

Where A is a constant which is determined by the boundary condition:

Equation 4

Substituting A with its expression in Equation 3 gives:

Equation 5

Considering that:

Equation 6

Equation 7

Combining Equation 5, Equation 6 and Equation 7:

Equation 8

RL// RP is the equivalent resistance of RL in parallel with RP:

Equation 9

Equation 8 is valid if iCL(t) ≥ 0 otherwise the active clamp is not triggered. In particular at

t = 0, iCL (t = 0) ≥ 0 is equivalent to:

L t

()

–

BAT

CL_LS

–

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

L t0

()

BAT

CL_LS

–

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

BAT

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

L t

()

CL_LS

-------------------e

–

CL_LS

BAT

–

---------------------------------------- for t

≥

()

–

pip

BAT

CL_LS

–

CL t

()

p t

() i

L t

()

CL t

()

CL_LS

-------------------e

–

CL_LS

BAT

–

L// Rp

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

–

L// Rp

-------

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

LRp

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

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