Vin

Vin

1

1

1 +

2

2

2

()

fuse

+48Vin

0V

Vout

Return

0V

C

Resistive / capacitive loading power factor

(See derating curve)

Power Factor =

1

1 +

2

(

)

Power factor =

1

2

πfCR

Vin

Vin

Fuse

0V

-48Vin

Vout

Return

R

C

Capacitive loading power factor

(See derating curve)

0V

(See Note 2 for DC biased current condition)

Vin

Vin

Fuse

+48Vin

0V

Vout

Return

Capacitive loading power factor

(See derating curve)

(See Note 2 for DC biased current condition)

R

C

0V

+48V

-48Vin

Automatic recovery time <2 cycle maximum

Short circuit occurs here

Short circuit removed

Internal sine

wave

reference

Output

PAGE 178

75VA

DC/AC ring generator

75VA DC/AC

|

TELEPHONE RING GENERATORS

Application notes

1

Automatic zero crossing recover after short circuit removed.

2

Examples of DC biased operation.

2.1 Non-biased operation

2.2 Negative DC Biased operation.

2.3 Positive DC biased operation.