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HC55130IMZ Datasheet(PDF) 26 Page - Renesas Technology Corp

Part # HC55130IMZ
Description  Low Power UniSLIC14 Family
PDF  36 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HC55130IMZ Datasheet(HTML) 26 Page - Renesas Technology Corp

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HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
FN4659 Rev 13.00
Page 26 of 36
June 1, 2006
Given: VBH = VBL = -48V, Loop current = 30mA, RL (load
across tip and ring) = 600
, Quiescent battery power =
(48V) (0.8mA) = 38.4mW, Quiescent VCC power = (5V)
(2.7mA) = 13.5mW, Power sharing resistor = 600
.
1. Without power sharing, the on-chip power dissipation
would be 952mW (Equation 42).
2. With power sharing, the on-chip power dissipation is
412mW (Equation 43). A power redistribution of 540mW.
On-chip power dissipation without power sharing resistor.
On-chip power dissipation with 600
 power sharing resistor.
Battery Selection
Battery selection is a technique, for a two battery supply
system, where the SLIC automatically diverts the loop
current to the most appropriate supply for a given loop
length. This results in significant power savings and lowers
the total power consumption on short loops. This technique
is particularly useful if most of the lines are short, and the on
hook condition requires a -48V battery. In Figure 26, it can
be seen that for long loops the majority of the current comes
from the high battery supply (VBH) and for short loops from
the low battery supply (VBL).
PD
VBH
 30mA
 38.4mW 13.5mW
RL
 30mA

2
–
++
=
(EQ. 42)
PD
952mW
=
PD
VBH
 30mA
 38.4mW 13.5mW
++
=
(EQ. 43)
RL
 30mA

2
–
RPS
 30mA

2
–
PD
412mW
=
FIGURE 25. POWER SHARING (SINGLE SUPPLY SYSTEMS)
VTX
VRX
UniSLIC14
TIP
RING
VBL
VBH
-48V
-48V
ON SHORT LOOPS, THE
MAJORITY OF CURRENT
FLOWS OUT THE VBL PIN
RPS
FIGURE 26. BATTERY SELECTION (DUAL SUPPLY SYSTEMS)
0
35
30
25
20
15
10
5
LOOP RESISTANCE (
)
40
VBH = -48V
VBL = -24V
RILim = 33.2k
VBL
VBH
VBH
VBL
Pinouts - 28 Lead PLCC Packages
HC55120
(28 LEAD PLCC)
TOP VIEW
HC55121
(28 LEAD PLCC)
TOP VIEW
RSYNC
ILIM
ROH
RD
AGND
GKD
VCC
1
2
3
4
5
6
7
8
9
10
11
12 13 14 15 16 17 18
19
20
21
22
23
24
25
26
27
28
BGND
TIP
VBH
VBL
RING
CRT
RDC_RAC
RSYNC_REV
ILIM
ROH
RD
AGND
GKD
VCC
1
2
3
4
5
6
7
8
9
10
11
12 13 14 15
16 17
18
19
20
21
22
23
24
25
26
27
28
BGND
TIP
VBH
VBL
RING
CRT_REV
RDC_RAC



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