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UM1556 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

tên linh kiện UM1556
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UM1556 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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UM1556
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Doc ID 023520 Rev 2
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Figure 7.
Positive ISO pulse
The most severe negative ISO pulse to consider is test pulse 1 at level IV (-100 V@2 ms).
This pulse is directly transferred to the GND pin. The maximum peak reverse voltage of the
diode should therefore be at least 100 V.
Note:
The diode works in avalanche mode if pulse level is above the rated reverse voltage.
Figure 8.
Negative ISO pulse
Note:
As seen from the above explanation, the HSD with diode protection in the GND pin doesn’t
clamp negative ISO pulses at supply line. Therefore an appropriate serial protection resistor
should be used between the µC and HSD.The resistor value should be calculated according
to maximum injected current to the I/O pin of the used microcontroller.
Note:
Diode parameters can be lower if an external clamping circuitry is used (e.g. HSD module is
supplied from a protected power supply line).



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