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L6377 Arkusz danych(PDF) 11 Page - STMicroelectronics |
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L6377 Arkusz danych(HTML) 11 Page - STMicroelectronics |
11 / 16 page L6377 Demagnetisation of inductive loads 11/16 8 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 7. External demagnetisation circuit (versus ground) Figure 6. Input comparator hysteresis Vi+ Vs Vout 100mV D94IN079 Vi- 100mV DRIVER VS OVC OUT RS SHORT CIRCUIT CONTROL UV CURRENT LIMIT D94IN112 VZ VZ < Vcl (min) - VS (max) |
Podobny numer części - L6377_08 |
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Podobny opis - L6377_08 |
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