B2050C
| Model | B2050C |
| Description | solid state crowbar devices |
| PDF file | Total 212 pages (File size: 2M) |
| Chip Manufacturer | TECCOR |
SIDACtor Device Selection Criteria
The maximum available surge current is calculated by dividing the peak surge voltage (V
PK
)
by the total circuit resistance (R
TOTAL
):
I
PK(available)
= V
PK
/R
TOTAL
For longitudinal surges (Tip-Ground, Ring-Ground), R
TOTAL
is calculated for both Tip and
Ring:
R
SOURCE
=
V
PK
/I
PK
R
TOTAL
= R
TIP
+ R
SOURCE
R
TOTAL
= R
RING
+ R
SOURCE
For metallic surges (Tip-Ring):
R
SOURCE
=
V
PK
/I
PK
R
TOTAL
= R
TIP
+ R
RING
+ R
SOURCE
Example 1:
A modem manufacturer must pass the Type A surge requirement of TIA-968 (formerly
known as FCC Part 68) without any series resistance.
I
PK
= 100 A, 10x560 µs
I
PP
³
100 A, 10x560 µs
Therefore, either a “B” rated or “C” rated
SIDACtor
device would be selected.
Example 2:
A line card manufacturer must pass the surge requirements of GR 1089 with 30
W
on Tip
and 30
W
on Ring.
I
PK
= 100 A, 10x1000 µs
V
PK
= 1000 V
R
SOURCE
=
V
PK
/I
PK =
10
W
R
TOTAL
= R
SOURCE
+
R
TIP
= 40
W
I
PK (available)
= V
PK
/R
TOTAL
= 1000 V/40
W
\
I
PP
³
25 A
Holding Current (I
H
)
Because TIA-968 4.4.1.7.3 specifies that registered terminal equipment not exceed
140 mA dc per conductor under short-circuit conditions, the holding current of the
SIDACtor
device is set at 150 mA.
For specific design criteria, the holding current (I
H
) of the
SIDACtor
device must be greater
than the DC current that can be supplied during an operational and short circuit condition.
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+1 972-580-7777
5-6
SIDACtor
®
© 2002 Teccor Electronics
Data Book and Design Guide
