L6376 Demagnetization of inductive loads
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11 Demagnetization of inductive loads
The device has four internal clamping diodes able to demagnetize inductive loads.
The limitation is the peak power dissipation of the packages, so — if the loads are big or if
there is the possibility to demagnetize more loads contemporarly — it is necessary to use
external demagnetization circuits.
In Figure 7 and Figure 8 are shown two topologies for the demagnetization versus ground
and versus V
S
.
The breakdown voltage of the external device (V
Z
) must be chosen considering the
minimum internal clamping voltage (V
cl
) and the maximum supply voltage (V
S
).
Figure 6. Input comparator hysteresis
Figure 7. External demagnetization circuit (versus ground)
V
i
V
s
V
out
100mV
D94IN131
1.25V
100mV
DRIVER
V
CP
V
S
OVC
O
4
O
3
O
2
O
1
D94IN109
R
S
SHORT CIRCUIT
CONTROL
UV
CURRENT
LIMIT
V
Z
V
Z
< V
cl (min)
- V
S (max)
