參數(shù)資料
型號(hào)： PBL38773/1ML
廠商： INFINEON TECHNOLOGIES AG
元件分類： 模擬傳輸電路
英文描述： TELECOM-SLIC, PQCC32
封裝： PLASTIC, VQFN-32
文件頁(yè)數(shù)： 50/64頁(yè)
文件大?。?/td> 1052K
代理商： PBL38773/1ML
Ringing FlexiSLIC
PBL 38773/1
Power Dissipation Considerations
Data Sheet
54
DS1, 2003-06-18
four times the time
t
R. In some applications the time for the ringing and silent periods are
equal, and the SLIC will dissipate more power.
The power dissipation in the SLIC for the burst can be calculated using (for a sinusoidal
shaped ring signal):
[34]
where:
Z
Loop can be calculated using:
[35]
where:
[36]
Example:
P
R
Power dissipation in Ringing
P
s
Supply power
P
L
The power in the Load
V
BAT
Potential at pin
V
Ring
Peak to peak voltage between tip and ring during ringing
P
RingBias
Power dissipation in Ringing without load, typical value 0.3 W
Z
Loop
Total line impedance, including fuse and the telephone impedance (in
this case the on-hook resistance)
R
Line
Line resistance, typical 0-500
R
Bell
Total bell resistance
R
F
Fuse and protection resistance, typical 40
f
Ring
Ring frequency
C
Bell
Total bell capacitance
P
R
P
S
P
L
2
π
---
V
BAT
×
V
Ring
Z
Loop
-------------
×
V
Ring
()
2
Θ
L
cos
×
2
Z
Loop
--------------------------------------------
–
P
RingBias
+
=
–
=
Z
Loop
R
Line
R
Bell
2
R
F
++
()
2
1
2
π f
Ring
C
Bell
×
--------------------------------------------
2
+
=
Θ
L
α
12
π f
Ring
C
Bell
×
()
R
CU
R
Bell
2
R
F
++
------------------------------------------------------------
tan
–
=
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