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| 型號(hào)： | HC5518X |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁(yè)數(shù)： | 2/5頁(yè) |
| 文件大?。?/td> | 37K |
| 代理商： | HC5518X |
2
The circuit in Figure 2 is recommended for applications
where the high battery voltage (V
BH
) can range up to -85V.
To understand the selection of the protection devices an
examination of the requirements placed upon the HC5518X,
the TVS and the PTC should be reviewed.
HC5518X Protection Requirements During Fault
Conditions
1. HC5518X’s Trip and Ring ports must survive 100V
PEAK
“residual” surges above ground or below VBH for 1
μ
s dur-
ing 2/10 lightning tests. This represents the typical “l(fā)et
through” lightning surge from the protection circuitry that
the SLIC will encounter.
2. HC5518X’s Tip and Ring ports must survive 3V
PEAK
“re-
sidual” surges above ground or below VBH during AC
power cross tests. This represents the typical “l(fā)et
through” AC power cross surge from the protection cir-
cuitry that the SLIC will encounter.
3. HC5518X must survive Tip and/or Ring faults to ground.
HC5518X Operational Conditions
1. Loop Current = 15mA to 45mA
2. Maximum ringing voltage = 83.4V
PEAK
(59V
RMS
)
3. MaximumOnHookRingingCurrent=42mA
RMS
(5REN).
PTC must not open.
4. MaximumOffHookRingingCurrent=254mA
RMS
(5REN
+ R
LOOP
5. V
BH
= -85V, V
BL
= -24V, RP = 35
s/leg.
Using the conditions above, the selection of the protection
resistance (RP), the TVS, and the PTC can be determined.
Protection Resistance Configuration
The HC5518X data sheet specifies 35
per leg for
protection resistance. As shown in Figure 2, RP has been
divided into 3 separate resistors and equals 35
. The total
resistance of the PTC and R
PT
on R
PR
should equal 15
.
The PTC represents 5
of RP (total) and limits the fault
current to the TVS/diode bridge and the HC5518X.
Additionally 10
,1W resistors are placed between the diode
bridge and the PTC. These resistors provide additional
current limiting to the diode bridge/TVS and the HC5518X.
Finally, 20
,
1
/
2
W resistors are placed between the diode
bridge and the HC5518X to provide the final current limiting
function to the SLIC. This arrangement provides the
necessary current limiting to the system, selection of lower
wattage resistors, and minimizes affects on circuit
performance.
TVS Selection
TVS devices are solid state SCR type structures that are
available in fixed or gate controlled breakover voltages
(VBO).
The gate controlled version is best suited for the
ringing SLIC application since its gate can be tied to the
battery voltage enabling the TVS to track variations in
the battery supply
. A “stopper” diode is placed in series
with the gate of the TVS to prevent the VBH power supply
from being shorted to ground whenever a fault condition
energizes the SCR protection device. Additionally, in multi-
line systems where power supplies are very robust, the
“stopper” diode serves to protect the SCR and prevent
disruption of service on the other lines. The Intersil
SGT27S10 gated TVS was selected using the following
criteria.
FIGURE 2. RSLIC18 PROTECTION CIRCUIT FOR V
BH
= -85V APPLICATION
R
P1
V
CC
VBL
V
BL
VBH
R
P2
D
1
D
2
D
4
D
3
RING
TIP
R
PT
R
PR
PTC
PTC
(TR600-150)
SG1
D
5
V
BH
BGND
AGND
VCC
5
5
10
10
20
20
C
G
0.1
μ
F
200V
RSLIC18
SGT27S10
(TR600-150)
T
R
Application Note 9842
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相關(guān)代理商/技術(shù)參數(shù) |
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| HC5518XEVAL1 | 制造商:Intersil Corporation 功能描述:EVALUATION BOARD FOR RS - Bulk 制造商:Rochester Electronics LLC 功能描述:EVALUATION BOARD FOR RS - Bulk |
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| HC5519 WAF | 制造商:Harris Corporation 功能描述: |
| HC5519CQ | 制造商:HARRIS 制造商全稱:HARRIS 功能描述:SLIC Subscriber Line Interface Circuit |
| HC5520 | 制造商:HARRIS 制造商全稱:HARRIS 功能描述:CO/PABX Polarity Reversal Subscriber Line Interface Circuit |
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