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UM1556 bảng dữ liệu(PDF) 49 Page - STMicroelectronics |
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UM1556 bảng dữ liệu(HTML) 49 Page - STMicroelectronics |
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49 / 87 page  UM1556 Switching inductive loads Doc ID 023520 Rev 2 49/87 The HSD channel is protected directly by the parallel transil. The clamping voltage of the transil should be below the minimum clamping voltage of the HSD (41 V). Such transils (VCL < 41 V) usually start conducting at 30 V, therefore there is a high probability that it is damaged during the clamped load dump pulse (36 V). For that reason it is usually better to use the previously described solution (1). 3) Freewheeling diode and reverse battery diode A general purpose diode connected in parallel with the load provides a conductive path for proper demagnetization. Relatively small demagnetization voltage (1 diode voltage drop in forward direction) leads to a very slow demagnetization. This can have a negative influence when driving the relay, for example. A slow movement of the armature (slow opening of contacts) can have a negative influence on the lifetime of the relay contacts (depending on the switching current). In order to protect the freewheeling diode against the reverse battery condition, there is an additional diode (Dr) required in series with the output. This circuitry is suitable only for small loads because of permanent voltage drop ( → power dissipation) on Dr during normal operation. 4) Freewheeling diode and reverse battery P-channel MOS circuitry L R Vbat GND OUT Rgnd Dgnd GND GND Clamp Vout Iout T L R Vbat GND OUT Rgnd Dgnd GND GND Clamp Vout Iout GND D Dr |
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