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L6376

0.5 A high-side driver quad intelligent power switch

STMicroelectronics 

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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