AN2846 datasheet(33/35 Pages) STMICROELECTRONICS

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AN2846

Electromagnetic compatibility (EMC) requirements

Doc ID 15130 Rev 1

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6.3.2

Results on VC pin

When a positive or negative surge voltage of 1 kV is applied on the supply resistor RC, the

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

reaches 0.45 A.

The wave shapes are similar to the previous ones as shown in Figure 43.

Figure 43.

VC behavior with RC = 2.2 kΩ

6.4

IEC 61000 4-6

This standard specifies the behavior of the device when subjected to conducted radio

frequency interference in the range 150 kHz to 80 MHz. The RF signal, 80% modulated by

1 kHz sinusoidal waveform, is injected at the inputs IIN and VCC through a coupling device

network (CDN). The required level defined into IEC 61131-2 is 3 V rms. With these stress

conditions, the system must continue to operate with no loss of function (A criterion).

The test configuration used is shown in Figure 44.

Figure 44.

RF test configuration

SCLT3-8 meets IEC 61000 4-6 and IEC 61311-2 standards requirements. Better immunity

can be obtained by decoupling pin SCK with a 470 pF capacitor.

Vsurge

+1kV

0.45A

40V

0.5kV/div

0.2A/div

20V/div

Vsurge

0.45A

-0.5kV/div

0.2A/div

1V/div

-1kV

Positive voltage surge

Negative voltage surge

CWS500C

CDN-AF2

1-8

GND

DUT

Scope

Reference plane

-6 dB

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