參數(shù)資料
型號(hào)： HC55131IM
廠商： INTERSIL CORP
元件分類： 模擬傳輸電路
英文描述： IC-VLTG REG+12V TO220 ISO
中文描述： TELECOM-SLIC, PQCC32
封裝： PLASTIC, MS-016AE, LCC-32
文件頁數(shù)： 14/35頁
文件大?。?/td> 382K
代理商： HC55131IM
4-14
On Hook Overhead Voltage
The on hook overhead voltage
at the load (V
OH
(on) at Load)
is independent of the V
BH
battery voltage. Once set, the
on hook voltage remains
constant as the V
BH
battery
voltage changes. The on hook
voltage also remains constant
over temperature and line
leakages up to 0.6 times the
Switch Hook Detect threshold (I
SHD
). The maximum loop
current for a constant on hook overhead voltage is defined
as ISH-.
The on hook overhead voltage, required for a given signal
level at the load, must take into account the AC voltage drop
across the 2 external protection resistors (R
P
) and the 2
internal sense resistors (R
S
) as shown in Figure 16. The AC
on hook overload voltage is calculated using Equation 1.
where
V
OH(on) at Load
= On hook overhead voltage at load
V
sp(on)
= Required on hook transmission for speech
R
P
= Protection Resistors (Typically 30
)
R
S
= Internal Sense Resistors (40
)
Z
L
= AC load impedance for (600
)
1.5V = Additional on hook overhead voltage requirement
To account for any process and temperature variations in the
performance of the SLIC, 1.5V is added to the overhead
voltage requirement for the on hook case in Equation 1 and
2.0V for the off hook case in Equation 3. Note the 2.5V
overhead is automatically generated in the SLIC and is not
part of the external overhead programming.
Off Hook Overhead Voltage
The off hook overhead
voltage V
OH
(off) at Load is
also independent of the V
BH
battery voltage and remains
constant over temperature.
The required off hook
overhead voltage is the sum
of the AC and DC voltage
drops across the internal
sense resistors (R
S)
, the
Internal overhead voltage automatically generated by the SLIC.
FIGURE 15. UniSLIC14 DC FEED CURVE
VBH
2.5V
VOH(off) AT LOAD
ISH-
ILOOP(min)
ILOOP(max)
60k
SLOPE
RLOOP(max)
SLIC SELF PROGRAMMING
T
LOOP CURRENT (mA)
IOH
CONSTANT
CURRENT
REGION
R
SAT
VOH(on) AT LOAD
I
SHD
V
BH
V
OH(on)
2.5V
ON HOOK
OVERHEAD
ISH-
LOOP CURRENT
T
DC FEED CURVE
ISH- = I
SHD
(0.6)
I
SHD
(EQ. 1)
V
OH on
)
at Load
V
sp on
)
1
2R
-----------------------------
2R
S
+
L
+
×
1.5V
+
=
FIGURE 16. OVERHEAD VOLTAGE OF THE TIP AND RING
AMPLIFIERS
TIP AND RING
AMPLIFIERS
INTERNAL SENSE
RESISTORS
EXTERNAL PROTECTION
RESISTOR
2R
P
2R
S
OVERHEAD VOLTAGE
V
OH
(ON, OFF)
Where:
V
ZL
is the required on hook or offhook
transmission delivered to the load.
Z
L
REQUIRED
(LOAD)
UniSLIC14
V
ZL
V
OH ON OFF
)
2R
-----------------------------
2R
S
+
L
V
ZL
=
V
BH
V
SAT
V
OH(off)
2.5V
OFF HOOK
OVER HEAD
T
LOOP CURRENT
I
LOOP(min)
DC FEED CURVE
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151
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