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UM1557 Datasheet(PDF) 39 Page - STMicroelectronics

Part # UM1557
Description  The aim of this document is to give the design engineer
PDF  111 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1557 Datasheet(HTML) 39 Page - STMicroelectronics

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UM1557
Switching inductive loads
Doc ID 023521 Rev 2
39/111
Substituting the TDEMAG and iOUT(t) by the formulas above we can calculate the energy
dissipated in the HSD:
Equation 4
Equation 5
(simplified for R
→0)
()
⋅
+
=
⋅
=
DEMAG
DEMAG
T
OUT
DEMAG
BAT
T
OUT
CLAMP
HSD
dt
t
i
V
V
dt
t
i
V
E
0
0
)
(
|
|
)
(


⋅
+
⋅
−
⋅
⋅
⋅
+
=
|
|
|
|
ln
|
|
|
|
0
0
2
DEMAG
DEMAG
DEMAG
DEMAG
BAT
HSD
V
R
I
V
V
I
R
L
R
V
V
E
|
|
|
|
2
1
lim
2
0
0
DEMAG
DEMAG
BAT
HSD
R
V
V
V
I
L
E
+
⋅
⋅
⋅
=
→



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