TISP4070L3BJ, TISP4350L3BJ
BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
AUGUST 1999 — REVISED NOVEMBER 1999
THERMAL INFORMATION
PEAK OVERLOAD ON-STATE CURRENT
vs
CURRENT DURATION
TI4LAA
40
35
30
TISP4xxxL3BJ WILL
CARRY CURRENT
25
20
100 A2s
OF TESTS 1 THRU 5
CLAUSE 6.6, UL 1950,
FOR FULL TEST TIME
40 A
15
7 A
10
9
8
7
6
5
4
3.5
2.2 A
WIRING
3
SIMULATOR
2.5
2
0·01
0·1
1
10
100
1000
t - Current Duration - s
Figure 2. PEAK OVERLOAD ON-STATE CURRENT AGAINST DURATION
APPLICATIONS INFORMATION
UL 1950, CSA C22.2 No. 950 and EN 60950
These electrical safety standards for IT (Information Technology) equipment at the customer premise use the
IEC (International Electro-technical Commission) 60950 standard as the core document. The IEC 60950
covers fundamental safety criteria such as creepage and isolation. The connection to a telecommunication
network voltage (TNV) is covered in clause 6.
Europe is harmonised by CENELEC (Comité Européen de Normalization Electro-technique) under EN 60950
(included in the Low Voltage Directive, CE mark). US has UL (Underwriters Laboratories) 1950 and Canada
CSA (Canadian Standards Authority) C22.2 No. 950. The US and Canadian standards include regional
changes and additions to the IEC 60950. A major addition is the inclusion of clause 6.6, power cross
withstand and annex NAC covering testing. Remarks made for UL 1950 will generally be true for CSA 22.2
No. 950.
UL 1950, clause 6.6 — power cross
Figure 3 shows the criterion flow for UL 1950 power cross. (This is a modified version of UL1950, Figure
18b — Overvoltage flowchart) There are many routes for achieving a pass result. For discussion, each
criterion has been given a letter reference. Brief details of any electrical testing is given as a criterion note.
Test pass criteria are given in the bottom table of Figure 3.
P R O D U C T
I N F O R M A T I O N
5
POINN [ POWER INNOVATIONS LTD ]
