AN1751 - APPLICATION NOTE

4/7

Overvoltage being directly linked to track lengh, voltage across IC may be much higher with few more

centimeters. Most of IC will not like it.

In the first case, IC can be destroyed while with the second layout IC is perfectly protected.

Figure 7 gives input and output voltages of an EMI filter with the suitable layout. The demoboard shows the

In

Out

E

EMI

325

GND

Vout measurement

Vin measurement

In

Out

E

EMI

325

GND

In

Out

E

EMI

325

E

EMI

325

®

®

®

®

ESD test board for EMI

Fig. 7: ESD demoboard and measurements on EMIF10-1K010F1.

Figure 8 shows the equivalent schematic with the ESD surge generator, the EMI Filter and the load which

corresponds to the device to be protected.

Rg

Vg

Rd

Rd

Vg

Rd

Vg

Vout

Vin

Vin

Vin

Fig. 8: Equivalent schematic of EMI filter connected to ESD surge generators.