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AN4402 Datasheet(PDF) 36 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
Logo STMICROELECTRONICS - STMicroelectronics

AN4402 Datasheet(HTML) 36 Page - STMicroelectronics

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Table 17. Demagnetization time and demagnetization energy for a high-side configured output
VBAT
range
Load conditions
tDEMAG_HS
Demagnetization time
EDEMAG_HS
Demagnetization energy in the high-side configured output
With parallel resistor
to the inductor
RL > 0Ω
with
with
, valid if
Without parallel
resistor to the inductor
RL > 0Ω
with
Without parallel
resistor to the inductor
RL = 0Ω
with
L
R
L
------- ln
V
CL_HS
V
BAT
+
V
CL_HS
----------------------------------------
R
L// Rp
R
L
--------------------



R
L//Rp
R
pRL
R
p
R
L
+
--------------------
=
V
CL_HS
V
BAT
+
() τ
R
L
------- VCL_HS VBAT
+
()
τ
R
L// Rp
-------------------- VCL_HS
()
–
1
R
p
R
L
R
p
+
--------------------
V
CL_HS
V
BAT
+
V
CL_HS
----------------------------------------
⋅



ln
+



τ
L
R
L
-------
=
R
p
V
CL_HS
V
BAT
------------------- R
L
>
L
R
L
------- ln
V
CL_HS
V
BAT
+
V
CL_HS
----------------------------------------



L
R
L
------- V
CL_HS
V
BAT
+
() I
L0
V
CL_HS
R
L
-------------------
V
CL_HS
V
BAT
+
V
CL_HS
----------------------------------------



ln
–



I
L0
V
BAT
R
L
--------------
=
LI
L0
V
CL_HS
-------------------
1
2
--- LIL0
2
V
CL_HS
V
BAT
+
V
CL_HS
----------------------------------------



I
L0
V
BAT
R
L
--------------
=



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