L6376
11
Demagnetization of inductive loads
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 VS.
The breakdown voltage of the external device (VZ) must be chosen considering the
minimum internal clamping voltage (Vcl) and the maximum supply voltage (VS).
Figure 6. Input comparator hysteresis
Vout
100mV 100mV
Vs
1.25V
D94IN131
Vi
Figure 7. External demagnetization circuit (versus ground)
VS
VCP
RS
CURRENT
LIMIT
OVC
DRIVER
O1
UV
SHORT CIRCUIT
CONTROL
O2
O3
O4
D94IN109
VZ
VZ < Vcl (min) - VS (max)
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