UM1556 datasheet(13/87 Pages) STMICROELECTRONICS

Numer części	UM1556

Szczegółowy opis	VIPower M0-5 and M0-5Enhanced

PDF	87 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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13 / 87 page

UM1556

General items

Doc ID 023520 Rev 2

13/87

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).

UM1556 Arkusz danych(PDF) 13 Page - STMicroelectronics