TISP3xxxF3 (HV) Overvoltage Protector Series
APPLICATIONS INFORMATION
Longitudinal Balance
Figure 1 7 shows a three terminal TISP ? device with its equivalent “delta” capacitance. Each capacitance, C TG , C RG and C TR , is the true
terminal pair capacitance measured with a three terminal or guarded capacitance bridge. If wire R is biased at a larger potential than
wire T, then C TG >C RG . Capacitance C TG is equivalent to a capacitance of CRG in parallel with the capacitive difference of (C TG -C R G).
The line capacitive unbalance is due to (C TG -C RG ) and the capacitance shunting the line is C TR +C RG /2.
All capacitance measurements in this data sheet are three terminal guarded to allow the designer to accurately assess capacitive
unbalance effects. Simple two terminal capacitance meters (unguarded third terminal) give false readings as the shunt capacitance via
the third terminal is included.
T
T
(C TG -C RG )
C TG
C RG
G
R
C RG
C TR
C TG > C RG
Equipment
G
R
C TR
C RG
Equivalent Unbalance
Equipment
AIXXAB
Figure 17.
“TISP” is a trademark of Bourns, Ltd., a Bourns Company, and is Registered in U.S. Patent and Trademark Office.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
MARCH 1994 - REVISED SEPTEMBER 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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