L6377 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Lista de partido

L6377

0.5 A high-side driver quad intelligent power switch

STMicroelectronics 

L6377

8

Demagnetisation of inductive loads

Demagnetisation of inductive loads

The L6377 has an internal clamping zener diode able to demagnetise inductive loads. Note

that the limitation comes from the peak power that the package can handle. Attention must

be paid to a proper thermal design of the board. If, for whatever reason (load current or

inductive value too big) the peak power dissipation is too high, an external Zener plus Diode

arrangement, can perform a demagnetisation versus Ground or versus Vs (see fig 5 and 6).

The breakdown voltage of the external Zener Diode must be chosen considering the internal

clamping voltage (Vcl) and the supply voltage (Vs) according to:

Vz < Vcl(min)-Vs(max)

for demagnetisation versus ground or

Vs(max)<Vz<Vcl(min)

for demagnetisation versus Vs.

Figure 6. Input comparator hysteresis

Vout

100mV 100mV

Vs

Vi-

D94IN079

Vi+

Figure 7. External demagnetisation circuit (versus ground)

DRIVER

VS

RS

CURRENT

OVC

LIMIT

UV

SHORT CIRCUIT

CONTROL

OUT

VZ

VZ < Vcl (min) - VS (max)

D94IN112

11/16

Share Link: