參數資料
| 型號： | ISL5586DIMZ |
| 廠商： | Intersil |
| 文件頁數： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SLIC RINGING LP HOME 28-PLCC |
| 標準包裝： | 37 |
| 系列： | RSLIC18 |
| 功能： | 用戶線路接口概念（SLIC） |
| 電路數： | 1 |
| 電源電壓： | 5V |
| 電流 - 電源： | 5mA |
| 功率（瓦特）： | 305mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應商設備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 管件 |
| 包括： | 回路啟動和振鈴往返檢測器，振鈴發(fā)生器，熱保護 |
10
FN4924.2
November 3, 2004
The slope of the feed characteristic and the battery voltage
define the maximum loop current on the shortest possible
loop as the short circuit current ISC.
The term ILIM is the programmed current limit, 1760/RIL. The
line segment IA represents the constant current region of the
loop current limit function.
The maximum loop resistance for a programmed loop
current is defined as RKNEE.
When RKNEE is exceeded, the device will transition from
constant current feed to constant voltage, resistive feed. The
line segment IB represents the resistive feed portion of the
load characteristic.
Power Dissipation
The power dissipated by the SLIC in the Forward Active
mode while on hook is strictly a function of the quiescent
currents for each supply.
Off hook power dissipation is increased above the quiescent
power dissipation by the DC load. If the loop length is less
than or equal to RKNEE, the device is providing constant
current (IA), and the power dissipation is calculated using
Equation 26.
If the loop length is greater than RKNEE , the device is
operating in the constant voltage, resistive feed region. The
power dissipated in this region is calculated using Equation 27.
Since the current relationships are different for constant
current versus constant voltage, the region of device
operation is critical to valid power dissipation calculations.
Reverse Active Mode
Overview
The reverse active mode (RA, 011) provides the same
functionality as the forward active mode. On hook transmission,
DC loop feed, and voice transmission are supported. Loop
supervision is provided by the switch hook detector. The device
may be operated from either high or low battery.
When in the Reverse Active mode the Tip and Ring DC
voltage characteristics exchange roles. That is, Ring is
typically 4V below ground and Tip is typically 4.5V more
positive than battery.
Silent Polarity Reversal
Changing from forward active to reverse active or vice versa
is referred to as polarity reversal. Many applications require
control of the polarity reversal transition time. Requirements
range from minimizing cross talk to protocol signalling.
The SLIC uses an external low voltage capacitor, CPOL, to
set the reversal time. The capacitor is isolated from the AC
loop so that loop stability is not influenced by its selection.
Once CPOL is set, the reversal time will remain nearly
constant over various load conditions.
The internal circuitry used to set the polarity reversal time is
shown in Figure 7. During Forward Active the switch is open
and the current from source I1 charges the external timing
capacitor CPOL. The internal resistor provides a clamping
function for the voltage at the POL node. When the Reverse
Active mode is initiated the switch closes and the difference
current (I2-I1) discharges the timing capacitor. The voltage at
the POL node drives one side of a transistor differential pair
which forces the Forward or Reverse condition on the Tip and
Ring amplifiers. The forward/reverse transition time is given by
Equation 28, where
time is the required reversal time.
Polarized capacitors may be used for CPOL. The low voltage
at the POL pin and minimal voltage excursion in the order of
±0.75V, are well suited for polarized capacitors.
FIGURE 6. ILOOP VERSUS RLOOP LOAD CHARACTERISTIC
RLOOP ()
RKNEE
ILIM
I LOO
P
(m
A
)
ISC
IA
IB
2RP
ISC
ILIM
VTR OC
() 2RPILIM
–
1.1e4
------------------------------------------------------
+
=
(EQ. 21)
IA ILIM
VTR OC
() RLOOPILIM
–
1.1e4
--------------------------------------------------------------
+
=
(EQ. 22)
RKNEE
VTR OC
()
ILIM
------------------------
=
(EQ. 23)
IB
VTR OC
()
RLOOP
------------------------
=
(EQ. 24)
PFAQ VBH I
×
BHQ
VBL IBLQ
×
VCC ICCQ
×
++
=
(EQ. 25)
PFA IA
()
PFA Q
()
VBLxIA
()
RLOOPxI2A
()
–
+
=
(EQ. 26)
PFA IB
()
PFA Q
()
VBLxIB
()
RLOOPxI2B
()
–
+
=
(EQ. 27)
CPOL
time
75000
----------------
=
(EQ. 28)
ISL5586
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