PCLT-2A

3 Surge voltage test circuit

11/18

2.3

ON state

are in ON state. The input current is then shared between the internal circuitry, the LED (about

60 %), and the driver output (about 30 %) in case of opto-coupler mode.

the circuit to allow the current to flow back to the power supply.

3

Surge voltage test circuit

The input and supply pins are designed to withstand electromagnetic interferences. They are

protected by a clamping diode that is connected to the common pin COM. Combined with the

kV, IEC61000-4-4) and the voltage surges (±1 kV,IEC61000-4-5).

This topology allows the surge voltage to be applied from each input to other inputs, the ground

and the supply contacts in differential or common modes (see figure 10).

surge voltage according to IEC61000-4-5 (see figure 11).

TM: Transil is a trademark of STMicroelectronics

Figure 10. Input pin IN voltage surge test

circuit

circuit

R

I

IN

1

R

I

IN

2

R

I

R

C

V

C

COM

P

V

CC

GND

PE/FE

PCLT-2

I

V

PP

V

PP

5nF

V

PP

V

PP

R

I

IN

1

R

I

IN

2

R

I

R

C

V

C

COM

P

V

CC

GND

PE/FE

PCLT-2

I

V

PP

V

PP

5nF

V

±500 V with 42

Ω

V

PP

V

PP

±1 kV

42

Ω

R

I

IN

1

R

I

IN

2

R

C

V

C

COM

V

CC

GND

PE/FE

PCLT-2

5nF

SM15T39C

±1kV

2

Ω

42

R

I

IN

1

R

I

IN

2

R

C

V

C

COM

V

CC

GND

PE/FE

PCLT-2

5nF

SM15T39C

2