P1200S Teccor Electronics, P1200S Datasheet - Page 168

• Manufacturer Part Number: P1200S
• Description: solid state crowbar devices
• Manufacturer: Teccor Electronics

SIDACtor Device Selection Criteria
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The maximum available surge current is calculated by dividing the peak surge voltage (V
by the total circuit resistance (R
For longitudinal surges (Tip-Ground, Ring-Ground), R
Ring:
For metallic surges (Tip-Ring):
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.
Example 2:
A line card manufacturer must pass the surge requirements of GR 1089 with 30 W on Tip
and 30 W on Ring.
Holding Current (I
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
than the DC current that can be supplied during an operational and short circuit condition.
I
R
R
R
R
R
I
I
Therefore, either a “B” rated or “C” rated SIDACtor device would be selected.
I
V
R
R
I
\ I
PK(available)
PK
PP
PK
PK (available)
PK
SOURCE
TOTAL
TOTAL
SOURCE
TOTAL
SOURCE
TOTAL
= 100 A, 10x560 µs
³ 100 A, 10x560 µs
= 100 A, 10x1000 µs
PP
= 1000 V
³ 25 A
= R
= R
= R
= R
=
=
=
= V
= V
V
TIP
RING
V
TIP
V
SOURCE
PK
PK
PK
PK
+ R
+ R
PK
/I
/I
/I
+ R
/R
PK
PK
PK =
/R
H
SOURCE
RING
)
+
TOTAL
TOTAL
SOURCE
R
10 W
TIP
+ R
= 40 W
= 1000 V/40 W
TOTAL
SOURCE
5 - 6
):
H
) of the SIDACtor device must be greater
SIDACtor
TOTAL
is calculated for both Tip and
®
Data Book and Design Guide
© 2002 Teccor Electronics
PK
)