Datasheet

DocID14117 Rev 4 27/44
B5973D Application information
44
compensate for the losses in the overall application. For this reason, the switching losses
related to the R
DSON
increases compared to an ideal case.
 Switching losses due to turning ON and OFF. These are derived using following
equation:
Equation 23
Where T
RISE
and T
FALL
represent the switching times of the power element that cause the
switching losses when driving an inductive load (see Figure 14). T
SW
is the equivalent
switching time.
Figure 14. Switching losses
 Quiescent current losses.
Equation 24
Where I
Q
is the quiescent current.
P
SW
V
IN
I
OUT
T
ON
T
OFF
+
2
------------------------------------ F
SW
V
IN
= I
OUT
T
SW
 F
SW
=
9
,1
,
2
9
)
287
9
'6
3
6:
3
21
7
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7
5,6(
,
6:,7&+
3
21
$0
P
Q
V
IN
I
Q
=