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AN4402 Datasheet(PDF) 17 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) 17 Page - STMicroelectronics

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DocID025557 Rev 1
17/39
AN4402
Demagnetization energy
38
Moreover, the demagnetization time decreases when RP decreases, therefore the battery
supplies less energy during the demagnetization phase.
is negative since RL// RP < RL. This term further decreases when RP decreases.
This explains the decrease of EDEMAG, when RP decreases.
The drawback of a low value of RP is the fact that the power losses in RP, when the inductive
load is on, are higher as the RP value is lower.
3.3
High-side configured outputs
3.3.1
Demagnetization energy with VBAT < VCL_LS – VCL_HS
By similarity between the circuits displayed in Figure 7 and Figure 10, we have the following
equivalence between low-side and high-side configured outputs when
VBAT < VCL_LS – VCL_HS:
Low-side: VCL_LS ↔ High-side: VBAT + VCL_HS
Replacing VCL_LS by VCL_HS + VBAT in Equation 19, Equation 20 and Equation 21 provides
the expression of the energy dissipated in the high-side driver during the switch-off phase.
t
DEMAG_LS
L
R
L
-------ln
V
CL_LS
V
CL_LS
V
BAT
–
----------------------------------------
R
L// Rp
R
L
--------------------



L
R
L
------- ln
V
CL_LS
V
CL_LS
V
BAT
–
----------------------------------------



R
L// Rp
R
L
--------------------



ln
+



==
R
L// Rp
R
L
--------------------



ln
Table 5. Analogies between the equations for a low-side and a high-side
Low-side
High-side, VBAT < VCL_LS – VCL_HS
VDS
VCL_LS
VBAT + VCL_HS
Voltage drop
across the load
VBAT - VCL_LS
-VCL_HS
iL(t)
with
and
with
and
di
L
dt
--------
i
L
τ
----
+
V
BAT
V
CL_LS
–
τR
L
---------------------------------------
=
τ
L
R
L
-------
=
I
L t0
=
()
I
L0
V
BAT
R
L
--------------
==
di
L
dt
--------
i
L
τ
----
+
V
CL_HS
τR
L
-------------------
–
=
τ
L
R
L
-------
=
I
L t0
=
()
I
L0
V
BAT
R
L
--------------
==



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