CPC7695 datasheet(22/25 Pages) IXYS

22 / 25 page

INTEGRATED CIRCUITS DIVISION

CPC7695

www.ixysic.com

R01

transient has not passed, current will again flow up to

the value allowed by the dynamic DC current limiting

of the switches and heating will resume, reactivating

the thermal shutdown mechanism. This cycle of

entering and exiting the thermal shutdown mode will

continue as long as the fault condition persists. If the

magnitude of the fault condition is great enough, the

external secondary protector will activate shunting the

fault current to ground.

2.11 External Protection Elements

The CPC7695 requires only over voltage secondary

protection on the loop side of the device. The

integrated protection feature described above negates

the need for additional external protection on the SLIC

side. The secondary protector must limit voltage

transients to levels that do not exceed the breakdown

voltage or input-output isolation barrier of the

CPC7695. A foldback or crowbar type protector is

recommended to minimize stresses on the CPC7695.

Consult IXYS Integrated Circuits Division’s application

note, AN-100, Designing Surge and Power Fault Protection

Circuits for Solid State Subscriber Line Interfaces for

equations related to the specifications of external

secondary protectors, fused resistors and PTCs.

CPC7695 Datenblatt(PDF) 22 Page - IXYS Corporation