AN4402 datasheet(14/39 Pages) STMICROELECTRONICS

14 / 39 page

Demagnetization energy

AN4402

14/39

DocID025557 Rev 1

Figure 8. Equivalent electrical diagram of the turn-off phase of an inductive load

driven by a low-side configured output, without parallel resistor to the load

VL is negative during the turn-off phase according to the used sign convention, since

diL/dt < 0.

Equation 14

Equation 15

The theoretical case where RL = 0Ω is considered by using VBAT= RLIL0 for RL> 0:

Equation 16

Using the Maclaurin development of order 2 of

for x in the vicinity

of 0 with

, we obtain:

lim

∞

→

DEMAG_LS

-------VCL_LS IL0

CL_LS

BAT

–

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

CL_LS

BAT

–

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







–







lim

∞

→

DEMAG_LS

-------

CL_LS

BAT

–

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







CL_LS

BAT

–

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







CL_LS

BAT

LIL0

–

CL_LS

BAT

–

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







LIL0

CL_LS

BAT

–

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













()

------

–

()

LIL0

CL_LS

BAT

–

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

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