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PEB2025 Datasheet(PDF) 8 Page - Siemens Semiconductor Group

Part No. PEB2025
Description  ISDN Exchange Power Controller
Download  21 Pages
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

PEB2025 Datasheet(HTML) 8 Page - Siemens Semiconductor Group

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Semiconductor Group
8
PEB 2025
During the first timestep (
t
OFF1 ) since overload of the negative wire aFi was detected ( I aFi I max ),
the current will be limited. Within the next timestep ( till
t
OFF3 ) the current must drop from 1.5 I max
to
I
max, otherwise the line driver turns off. After t OFF3 any current above I max results turn off the line
driver. After
t
OFF4, if no turn off of the line driver has occured, the current limiting characteristics
becomes active again and will be prepared for detection of further overload conditions.
Timestep
t
OFF1 is defined by charging the capacitor C T with the current I CLC which is specified in
the AC characteristics.
t
OFF3 and t OFF4 depend on t OFF1:
t
OFF3 ≈ 15
t
OFF1
t
OFF4 = t AR ≈ 50
t
OFF1
Note:
If aFi has been switched off due to the time dependent current limiting circuit while
C
Ti is charged,
an ON command has no effect. To turn on the line driver
C
Ti has to be discharged.
C
Ti will be discharged:
– by an OFF command
–if
t
OFF4 is reached
– in non-automatic restart mode if the line driver has been switched off due to an overload
condition.
Figure 4
Diagram of the Transient Permitted Overload (TPO) State


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