CPC7591_12 Datasheet, PDF (15/17 Pages) IXYS Corporation – Line Card Access Switch

INTEGRATED CIRCUITS DIVISION
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 CPC7591 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
CPC7591. A foldback or crowbar type protector is
recommended to minimize stresses on the CPC7591.
Consult IXYS IC 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.
CPC7591
R06
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