AN2846 datasheet(32/35 Pages) STMICROELECTRONICS

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Electromagnetic compatibility (EMC) requirements

AN2846

32/35

Doc ID 15130 Rev 1

6.3

IEC 61000 4-5

This standard specifies the behavior of the device when subjected to voltage surges applied

on all input pins of the system. For all analog inputs, the coupling method is a 42

Ω serial

resistance and a 0.5 µF capacitor. For the DC power line, the coupling is 2

Ω resistor, and

18 µF capacitor. The required voltage surge levels are:

●

1 kV for the input pins with RIN = 2.2 kΩ,

●

2.5 kV for the pin VC when RC = 2.2 kΩ or 1 kV when RC = 500 Ω.

The system must continue to operate as intended. Temporary degradation of the

performance is acceptable during the test, but the system must recover by itself after the

test (B criterion).

6.3.1

Results on input pins

When a positive surge voltage of 1 kV is applied on the input resistor RIN, the input active

clamp protects the SCLT3-8 input and limits the input voltage at 40 V. The input current

reaches 0.45 A.

When a negative voltage surge is applied the input diode is biased in forward mode and the

current is 0.45 mA (see Figure 42)

Figure 42.

VIN and IIN behavior

Vsurge

0.2kV/div

+ 1.0 kV

VIN

IIN

0.45A

0.2A/div

20V/div

40V

Vsurge

0.45A

0.5kV/div

0.2A/div

1V/div

-1.0 kV

Positive voltage surge

Negative voltage surge

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