4 Input reverse polarity robustness

PCLT-2A

12/18

4

Input reverse polarity robustness

corresponds to a connection mistake or a reverse biasing that is generated by the

demagnetization of a monitored inductive solenoid.

The involved input withstands the high reverse current up to 20 mA; its opto-coupler is OFF and

is protected by the conducting input diode. The input remains operational, and some extra

dissipation should be take place in their clamping protections.

+30 V.

Considering the supply operation, a reverse blocking diode can be connected between the

module ground and the common pin COM to protect the PCLT device against any spurious

reverse supply connection. Then, the whole module supply voltage rating is extended to ± 30 V.

OPTO

1

OPTO

2

Ω

750

750

Ω

I

I

GND (0V)

Vcc = + 30V

COM

OUT

1

OUT

2

I

REG4

1N4007

V

C

PCLT-2

IN

2

IN

1

I

REG N

V

2.2 k

750

Ω

750

I

1

I

3.6mA

9.7mA

13.3mA

COM

OUT

1

OUT

2

I

REG4

1N4007

V

C

PCLT-2

IN

2

IN

1

I

REG N

V