参数资料
| 型号： | ISL5585GCR-TK |
| 厂商： | Intersil |
| 文件页数： | 24/24页 |
| 文件大小： | 0K |
| 描述： | IC SLIC RINGING 3.3V VOB 32-QFN |
| 标准包装： | 1,000 |
| 功能： | 用户线路接口概念（SLIC） |
| 电路数： | 1 |
| 电源电压： | 3.3V |
| 功率（瓦特）： | 305mW |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（7x7） |
| 包装： | 带卷 (TR) |
| 包括： | 均衡和不均衡振铃，振铃声信号发生器，热关机，带警报指示器 |
9
Design Equations
Switch Hook Detect
The switch hook detect threshold is set by a single external
The term ISH is the desired DC loop current threshold. The
loop current threshold programming range is from 5mA to
15mA (40k
< RSH<120k).
Ground Key Detect
The ground key detector senses a DC current imbalance
between the Tip and Ring terminals when the ring terminal is
connected to ground. The ground key detect threshold is not
externally programmable and is internally fixed to 12mA
regardless of the switch hook threshold.
Ring Trip Detect
The ring trip detect threshold is set by a single external
resistor, RRT. IRT should be set between the peak ringing
current and the peak off hook current while still ringing.
In addition, the ring trip current must be set below the
transient current limit, including tolerances. The capacitor
CRT, in parallel with RRT, will set the ring trip response time.
Loop Current Limit
The loop current limit of the device is programmed by the
external resistor RIL. The value of RIL can be calculated
using Equation 3.
The term ILIM is the desired loop current limit. The loop
current limit programming range is from 15mA to 45mA
(39k
< RIL<117k).
Transient Current Limit
The drive current capability of the output tip and ring
amplifiers is programmed by an external resistor RTL. This
output current limit is separate from the DC loop current
limit function. The current limit circuit works in both the
source and sink direction, with an internally fixed offset to
prevent the current limit functions from turning on
simultaneously. The current limit function is provided by
sensing line current and reducing the voltage drive to the
load when the externally set threshold is exceeded, hence
forcing a constant source or sink current.
Transient Source Current Programming
The source current is externally programmed as shown in
Equation 4.
For example a source current limit setting of 95mA is
programmed with a 18.7k
(RTL) resistor connected from the
TL pin of the device to ground. This setting determines the
maximum amount of current which flows from Tip to Ring
during an off hook event until the DC loop current limit
responds. In addition this setting also determines the amount
of current which will flow from Tip or Ring when external
battery faults occur.
Transient Sink Current Programming
The sink current limit is internally offset 20% higher than the
externally programmed source current limit setting.
If the source current limit is set to 95mA, the sink current limit
will be 114mA. This setting will determine the maximum current
that flows into Tip or Ring when external ground faults occur.
Understanding Transient Current Limit
Each tip and ring amplifier is designed to limit source current
and sink current. Figure 1 shows the functionality of the
circuit for the case of limiting the source current. A similar
diagram applies to the sink current limit with current polarity
changed accordingly.
During normal operation, the error current (IERR) is zero and
the output voltage is determined by the signal current (ISIG)
multiplied by the 200K feedback resistor. With the current
polarity as shown for ISIG, the output voltage moves
positivewith respect to half battery. Assuming the amplifier
output is driving a load at a more negative potential, the
amplifier output will source current.
During excessive output source current flow, the scaled
output current (IO/K) exceeds the reference current (IREF)
forcing an error current (IERR). With the polarity as shown
the error current subtracts from the signal current, which
reduces the amplifier output voltage. By reducing the output
voltage the source current to the load is decreased and the
output current is limited.
Setting the Proper Transient Current Limit
Since this feature programs the maximum output current of
the device, the setting must be high enough to allow for
R
SH
600 I
SH
=
(EQ. 1)
R
RT
1800 I
RT
=
(EQ. 2)
R
IL
1760
I
LIM
-------------
=
(EQ. 3)
R
TL
1650
I
SRC
-------------
=
(EQ. 4)
I
SNK
1.20
I
SRC
×
=
(EQ. 5)
FIGURE 1. CURRENT LIMIT FUNCTIONAL DIAGRAM
TIP or RING
+
-
IREF = 1.21/TL
IO
IO/K
IERR
ISIG
20
200K
VB/2
ISL5585
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