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AN4402 Datasheet(PDF) 15 Page - STMicroelectronics

Part # AN4402
Description  Multichannel drivers driving inductive loads
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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AN4402 Datasheet(HTML) 15 Page - STMicroelectronics

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AN4402
Demagnetization energy
38
Equation 17
Equation 18
3.2.1
Summary of the demagnetization energy – low-side
3.2.2
Calculation example
An output of the L99MC6 is configured as low-side driver and it controls an inductive load in
the following conditions:
E
DEMAG_LS
R
P
+
∞
→
R
L
0
→
lim
1
2
---LI
L0
2
V
CL_LS
V
CL_LS
V
BAT
–
----------------------------------------



=
t
DEMAG_LS
R
P
+
∞
→
R
L
0
→
lim
LI
L0
V
CL_LS
V
BAT
–
----------------------------------------
=
Table 2. EDEMAG_LS
Conditions
Demagnetization energy in a low-side driver: EDEMAG_LS
With parallel resistor to
the inductive load
RL > 0 Ω
Equation 19
with
, valid if
Without parallel resistor to
the inductance RL > 0 Ω
Equation 20
with
Without parallel resistor to
the inductance RL = 0 Ω
Equation 21
with
V
CL_LS
τ
R
L
------- VCL_LS
τ
R
L// Rp
-------------------- VCL_LS VBAT
–
()
–
1
R
p
R
L
R
p
+
--------------------
V
CL_LS
V
CL_LS
V
BAT
–
---------------------------------------
⋅



ln
+



τ
L
R
L
-------
=
R
p
V
CL_LS
V
BAT
–
V
BAT
--------------------------------------- RL
>
L
R
L
-------
V
CL_LS IL0
V
CL_LS
V
BAT
–
R
L
---------------------------------------
V
CL_LS
V
CL_LS
V
BAT
–
---------------------------------------



ln
–



I
L0
V
BAT
R
L
--------------
=
1
2
--- LI
L0
2
V
CL_LS
V
CL_LS
V
BAT
–
---------------------------------------



I
L0
V
BAT
R
L
--------------
=



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