參數(shù)資料
型號: ISL5585ECMZ
廠商: INTERSIL CORP
元件分類: 模擬傳輸電路
英文描述: 3.3V Ringing SLIC Family for Voice Over Broadband (VOB)
中文描述: TELECOM-SLIC, PQCC28
封裝: LEAD FREE, PLASTIC, MS-018AB, LCC-28
文件頁數(shù): 21/24頁
文件大小: 455K
代理商: ISL5585ECMZ
21
switch is designed to have a maximum on voltage of 0.6V
with a load current of 45mA.
Since the device provides the ringing waveform, the relay
functions which may be supported include subscriber
disconnect, test access or line interface bypass. An external
snubber diode is not required when using the uncommitted
switch as a relay driver.
Test Load
The switch may be used to connect test loads across Tip and
Ring. The test loads can provide external test termination for
the device. Proper connection of the uncommitted switch to
Tip and Ring is shown below.
The diode in series with the test load blocks current from
flowing through the uncommitted switch when the polarity of
the Tip and Ring terminals are reversed. In addition to the
reverse active state, the polarity of Tip and Ring are reversed
for half of the ringing cycle. With independent logic control
and the blocking diode, the uncommitted switch may be
continuously connected to the Tip and Ring terminals.
Special Considerations for the QFN
Package
The new Quad Flatpack No-lead (QFN) package offers a
significant footprint reduction (65%) and improved thermal
performance with respect to the 28 lead PLCC. To realize the
thermal enhancements and maintain the high voltage
(-100V) performance, the exposed pad on the bottom of the
QFN package should be soldered to a power/heat sink plane
that is electrically connected to the ISL5585
S
ubstrate
C
ommon
C
onnection (SCC) pin. The heat is distributed
evenly across the board by way of the heat sink plane. This
is accomplished by using conductive thermal vias.
Reference technical brief TB379 and AN9922 for additional
information on thermal characterization and board layout
considerations.
FIGURE 15. EXTERNAL RELAY SWITCHING
RELAY
SW+
SW-
SWC
+V
FIGURE 16. TEST LOAD SWITCHING
RING
TIP
TEST
LOADSW+
SW-
SWC
TABLE 2. ISL5585 3V APPLICATION CIRCUIT COMPONENTS
COMPONENT
VALUE
ISL5585
18.7k
23.7k
49.9k
71.5k
66.5k
30.1k
36.5k
42.2Kk
45.3k
0.47
μ
F
4.7
μ
F
0.1
μ
F
0.1
μ
F
1N400X type with breakdown > 100V.
TOL
N/A
1%
1%
1%
1%
1%
1%
1%
1%
1%
20%
20%
20%
20%
RATING
N/A
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
0.1W
10V
6.3V
>100V
100V
U1 - Ringing SLIC
R
TL
R
RT
R
SH
R
IL
R
S
R
F
R
A
R
B
R
IN
C
RS
, C
TX
, C
RT
, C
POL
C
DC
, C
FB
C
PS1
C
PS2
, C
PS3
D
1
R
P1
, R
P2
Standard applications will use
49
per side. Protection resistor
values are application dependent and will be determined by
protection requirements.
Design Parameters: Ring Trip Threshold = 76mA
PEAK
, Switch Hook
Threshold = 12mA, Loop Current Limit = 24.6mA, Synthesize Device
Impedance = (3*66.5k
)
/400 = 498.8
, with 49.9
protection
resistors, impedance across Tip and Ring terminals = 599
.
Transient current limit = 95mA.
ISL5585
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