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參數(shù)資料
| 型號(hào)： | HC5513BIP |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TVS 1500W 43V UNIDIRECT SMC |
| 中文描述： | TELECOM-SLIC, PDIP22 |
| 封裝： | PLASTIC, MS-010-AA, DIP-22 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 175K |
| 代理商： | HC5513BIP |
62
Figure 15 shows the relationship between the saturation
guard voltage, the loop current and the loop resistance. Notice
from Figure 15 that for a loop resistance <1.2k
(R
SG
=
21.4k
) the SLIC is operating in the constant current feed
region and for resistances >1.2k
the SLIC is operating in the
resistive feed region. Operation in the resistive feed region
allows long loop and off-hook transmission by keeping the tip
and ring voltages off the rails. Operation in this region is
transparent to the customer.
The Saturation Guard circuit (Figure 13) monitors the tip to
ring voltage via the transconductance amplifier A
1
. A
1
generates a current that is proportional to the tip to ring
voltage difference. I
1
is internally set to sink all of A
1
’s current
until the tip to ring voltage exceeds 12.5V. When the tip to ring
voltage exceeds 12.5V (with no R
SG
resistor) A
1
supplies
more current than I
1
can sink. When this happens A
2
amplifies its input current by a factor of 12 and the current
through R
1
becomes the difference between I
2
and the output
current from A
2
. As the current from A
2
increases, the voltage
across R
1
decreases and the output voltage on R
DC
decreases. This results in a corresponding decrease in the
loop current. The R
SG
pin provides the ability to increase the
saturation guard reference voltage beyond 12.5V. Equation 3
gives the relationship between the R
SG
resistor value and the
programmable saturation guard reference voltage:
where:
V
SGREF
= Saturation Guard reference voltage.
R
SG
= Saturation Guard programming resistor.
When the Saturation guard reference voltage is exceeded,
the tip to ring voltage is calculated using Equation 4:
where:
V
TR
= Voltage differential between tip and ring.
R
L
= Loop resistance.
For on-hook transmission R
L
=
∞
, Equation 4 reduces to:
The value of R
SG
should be calculated to allow maximum
loop length operation. This requires that the saturation guard
reference voltage be set as high as possible without clipping
the incoming or outgoing VF signal. A voltage margin of -4V
on tip and -4V on ring, for a total of -8V margin, is
recommended as a general guideline. The value of R
SG
is
calculated using Equation 6:
where:
V
BAT
= Battery voltage.
V
MARGIN
= Recommended value of -8V to allow a maximum
overload level of 3.1V
PEAK
.
For on-hook transmission, R
L
=
∞
, Equation 6 reduces to:
SLIC in the Standby Mode
Overall system power is saved by configuring the SLIC in the
standby state when not in use. In the standby state the tip
and ring amplifiers are disabled and internal resistors are
connected between tip to ground and ring to V
BAT
. This
connection enables a loop current to flow when the phone
goes off-hook. The loop current detector then detects this
current and the SLIC is configured in the active mode for
voice transmission. The loop current in standby state is
calculated as follows:
where:
I
L
= Loop current in the standby state.
R
L
= Loop resistance.
V
BAT
= Battery voltage.
(AC) Transmission Path
SLIC in the Active Mode
Figure 16 shows a simplified AC transmission model. Circuit
analysis yields the following design equations:
0
10
20
30
0
10
20
30
40
50
LOOP CURRENT (mA)
T
V
BAT
= -24V, R
SG
=
∞
V
BAT
= -48V, R
SG
= 21.4k
SATURATION GUARD
VOLTAGE, V
TR
= 38V
RESISTIVE FEED
REGION
CONSTANT CURRENT
FEED REGION
R
RSG
= 21.4k
R
RSG
=
∞
100k
100k
4k
1.5k
2k
700
<400
<1.2k
R
L
R
L
SATURATION GUARD
VOLTAGE, V
TR
= 13V
FIGURE 15. V
TR
vs I
L
AND R
L
V
SGREF
12.5
------------------
5
SG
+
=
(EQ. 3)
V
TR
R
L
16.66
L
5
10
5
DC2
R
SG
)
600
+
DC1
---------+
×
=
(EQ. 4)
V
TR
16.66
5
------------------
5
SG
+
=
(EQ. 5)
R
SG
5
------------------------------------------
+
V
BAT
V
MARGIN
–
(
)
1
)
L
16.66V
–
×
----------------------------------------------------------------------------------------------+
=
(EQ. 6)
R
SG
5
BAT
MARGIN
--------------------–
=
(EQ. 7)
I
L
V
L
3V
–
---------+
≈
(EQ. 8)
V
TR
V
TX
I
M
2R
F
+
=
(EQ. 9)
V
T
----------
V
RX
-----------
+
I
------------
=
(EQ. 10)
V
TR
E
G
I
M
Z
L
–
=
(EQ. 11)
HC5513
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