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參數(shù)資料
| 型號(hào)： | HC5518X |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 37K |
| 代理商： | HC5518X |
3
Selection of TVS for Lightning and Power Line
Cross
10/1000 waveform = 1000V, 40A (GR-1089)
2/10 waveform = 2500V, 125A (GR-1089)
Peak line voltage to ground (40A peak current) = 25V
(measured)
Peak line to TVS gate voltage (40A peak current) = -15V
(measured)
Maximum Line to ground voltage = -90V (GR-1089)
Maximum Gate to line voltage = -90V (GR-1089)
Maximum gate current (10ms) = 1A (GR-1089)
Gate Trigger Current (Igt) = 150mA
Holding Current = 100mA
PTC (Positive Temperature Coefficient Thermistor)
Selection
For the HC5518X protection circuitry the TR600-150 was
selected. As a general rule of thumb, the PTC should have
the lowest off state resistance possible. This allows for ease
of matching to minimize affects on system performance.
Additionally the TR600-150 resistance is specified as 6
which comprises part of the total protection resistance for
the HC5518X.
PTC Specifications
PTC Resistance = 5
to 12
at 20
o
C
1 Hour Post Trip Resistance = 20
at = 20
o
C
PTC Holding Current = 83mA at 70
o
C
55 Second Time To Trip at 20
o
C = 350mA
55 Second Time To Trip at 70
o
C = 193mA
Maximum Operating Voltage = 60V
Maximum Interrupt Voltage = 600V
Maximum Interrupt Current = 3A
With the selected components as shown in Figure 2, the
protection circuitry can be prototyped and tested to
GR-1089 requirements. It should be understood that
HC5518X protection circuit is not limited to the
recommended selections but any alternative selection
would require retesting to GR-1089.
HC5518X Protection Circuit Surge Testing
Procedure
The HC5518 protection circuit as shown in Figure 2 was
tested to GR-1089 requirements. The HC5518 was exposed
to each fault condition in all of its operating modes. Table 1
shows the operating modes for the HC5518X device. Using
the circuit shown in Figure 2, the appropriate test signal
generator and sequencing control is applied to the T and R
ports at the PTCs. For lightning surge tests, Table 2
identifies the tests to be performed and the procedure. For
AC power cross tests, Table 3 gives the tests to be
performed and the procedure.
Three HC5518Xs were tested to all of the fault conditions
listed in Tables 2 and 3. Pre and post data was recorded for
each of the surge tests. The governing criteria for pass or fail
is given in the last Item of each of the test procedures.
Checking Ringing Capability
Once the protection circuitry has been selected and tested,
the ringing capability of the SLIC should be evaluated for
possible limitations. The HC5518X ringing capability was
tested under conditions illustrated in Figure 3. The input
ringing signal (sinewave) applied to the VRS pin was
adjusted for maximum peak voltage swing on Tip and Ring
while applying 1, 3, and 5 REN loads. The results of the
evaluation are shown in Table 4.
Surge Test Results and Conclusion
Three HC5518X devices passed all of the fault conditions
applied as recommended by GR-1089. After each fault
condition was removed, the devices under test returned to
their normal operating state that was selected. The
protection circuitry as recommended in Figure 2 can be used
to meet specific requirements for secondary fault protection
identified in GR-1089.
TABLE 1. RSLIC OP MODE CONTROL
OP MODE
F2
F1
F0
E0
BSEL
Forward Active
L
L
H
H
H/L
Reverse Active
L
H
H
H
H/L
Low Power Standby
L
L
L
H
H/L
Ringing
H
L
L
H
H/L
Tip Open
H
H
L
H
H/L
Forward Loop Back
H
L
H
H
H/L
Power Denial
H
H
H
H
H/L
Application Note 9842
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