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HC5523IP bảng dữ liệu(PDF) 9 Page - Intersil Corporation

tên linh kiện HC5523IP
Giải thích chi tiết về linh kiện  LSSGR/TR57 CO/Loop Carrier SLIC with Low Power Standby
PDF  22 Pages
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nhà sản xuất  INTERSIL [Intersil Corporation]
Trang chủ  http://www.intersil.com/cda/home
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HC5523IP bảng dữ liệu(HTML) 9 Page - Intersil Corporation

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9
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
Ω
(RSG = 4.0kΩ) the SLIC is operating in the constant current
feed region and for resistances >1.2k
Ω 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 A1. A1
generates a current that is proportional to the tip to ring
voltage difference. I1 is internally set to sink all of A1’s
current until the tip to ring voltage exceeds 12.5V. When the
tip to ring voltage exceeds 12.5V (with no RSG resistor) A1
supplies more current than I1 can sink. When this happens
A2 amplifies its input current by a factor of 12 and the current
through R1 becomes the difference between I2 and the
output current from A2. As the current from A2 increases, the
voltage across R1 decreases and the output voltage on RDC
decreases. This results in a corresponding decrease in the
loop current. The RSG pin provides the ability to increase the
saturation guard reference voltage beyond 12.5V. Equation
3 gives the relationship between the RSG resistor value and
the programmable saturation guard reference voltage:
where:
VSGREF = Saturation Guard reference voltage.
RSG = Saturation Guard programming resistor.
When the Saturation guard reference voltage is exceeded,
the tip to ring voltage is calculated using Equation 4:
where:
VTR = Voltage differential between tip and ring.
RL = Loop resistance.
For on-hook transmission RL = ∞, Equation 4 reduces to:
HC5523
VTX
RRX
RDC1
RDC2
CDC
RSN
RDC
IRSN
TIP
RING
-2.5V
IRING
ITIP
A2
ITIP
IRING
RSG
RSG
-5V
LOOP CURRENT
CIRCUIT
SATURATION GUARD
CIRCUIT
A1
I1
I2
R1
+
-
+
-
+
-
+
-
FIGURE 13. DC LOOP CURRENT
-5V
-5V
17.3k
Ω
01.2K
-50
-40
-30
-20
-10
0
VBAT = -48V, IL = 23mA, RSG = 4.0kΩ
LOOP RESISTANCE (
Ω)
VTIP
VRING
RESISTIVE FEED
REGION
CONSTANT CURRENT
FEED REGION
SATURATION
GUARD VOLTAGE
SATURATION
GUARD VOLTAGE
∞
FIGURE 14. VTR vs RL
0
10
20
30
0
10
20
30
40
50
LOOP CURRENT (mA)
VBAT = -24V, RSG = ∞
VBAT = -48V, RSG = 4.0kΩ
SATURATION GUARD
RESISTIVE FEED
REGION
CONSTANT CURRENT
FEED REGION
RSG = 4.0kΩ
100k
Ω
100k
Ω
4k
Ω
1.5k
Ω
2k
Ω
700
Ω
<400
Ω
<1.2k
Ω
RL
RL
RSG = ∞Ω
VOLTAGE, VTR = 38V
SATURATION GUARD
VOLTAGE, VTR = 13V
FIGURE 15. VTR vs IL and RL
V
SGREF
12.5
510
•
5
R
SG
17300
+
-----------------------------------
+
=
(EQ. 3)
V
TR
R
L
16.66
5
10
5
•
R
SG
17300
+
()
⁄
+
R
L
R
DC1
R
DC2
+
() 600
⁄
+
------------------------------------------------------------------------------------
×
=
(EQ. 4)
V
TR
16.66
510
5
•
R
SG
17300
+
-----------------------------------
+
=
(EQ. 5)
HC5523



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