le79489 Zarlink Semiconductor, le79489 Datasheet - Page 11

• Manufacturer Part Number: le79489
• Description: Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

Thermal Management Equations (Active, Normal, and Reverse Polarity States)
R
R
R
P
P
P
GDC
(OVH = 1)
(OVH = 0)
RTMG
RTMG
SLIC
FEED
TMG
TMG
≥
≥
=
=
=
=
=
---------------------------------- -
---------------------------------------
V
V
47.9
(
2 R
I
BAT2
BAT2
(
-------------------------------------------------------------------------------------------
(
----------------------------------------------------------------------------------------------- -
V
LOOPmax
I
•
LOOPmax
V
V
BAT2


BAT2
BAT2
------------------------------------ -
120 kΩ
FUSE
40 kΩ
–
–
6 V
7.5 V
•
–
–
+
I
L
(
6 V
7.5 V
+


R
(
+
)
R
R
---------------------------------
RFA
TMG
–
RFA
DC1
TMG
–
P
(
RTMG
GDC
–
I
+
L
(
+


(OVH = 1)
(OVH = 0)
+
I
•
40
L
R
40
R
Table 2. User-Programmable Components (continued)
•
DC2
)
–
L
2
)
R
2
R
)
L
)


L
2
)
(
)
•
R
2
(
( )
TMG
R
I
L
TMG
2
)
+
)
0.22 W
Zarlink Semiconductor Inc.
11
The DC feed resistance can be adjusted with a resistance (RFA)
from the RFA pin to ground.
R
power dissipation within the SLIC in Active states only.
Power dissipated in the thermal management resistor, R
during the Active states.
Power dissipated in the SLIC while in the Active states.
TMG
is connected from TMG to VBAT2 and is used to limit
TMG
,