
4-8
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Typical Applications
Typical Component Values
C
1
= 0.5
μ
F, 30V.
C
2
= 1.0
μ
F
±
10%, 20V (for other values of C
2
, refer to
AN9667).
C
3
= 0.01
μ
F, 100V,
±
20%.
C
4
= 0.01
μ
F, 100V,
±
20%.
C
5
= 0.01
μ
F, 100V,
±
20%.
C
AC
= 0.5
μ
F, 20V.
KZ
0
= 60k
, (Z
0
= 600
, K = Scaling Factor = 100).
R
L1
, R
L2
; Current Limit Setting Resistors:
R
L1
+ R
L2
> 90k
→
offset.
I
LIMIT
= (0.6) (R
L1
+ R
L2
)/(200 x R
L2
), R
L1
typically 100k
.
K
RF
= 20k
, RF = 2(R
B2
+ R
B4
), K = Scaling Factor = 100).
R
B1
= R
B2
= R
B3
= R
B4
= 50
(1% absolute, matching
requirements covered in a Tech Brief).
R
S1
= R
S2
= 1k
, typically.
C
S1
= C
S2
= 0.1
μ
F, 200V typically, depending on V
Ring
and
line length.
Z
1
= 150V to 200V transient protector. PTC used as ring
generator ballast.
V
B
-
BG
C
2
DG
AG
V
B
+ C
1
R
B4
C
3
C
4
5V
I
LIMIT
V
RX
+
V
FB
V
TX
-IN1
OUT1
R
L1
C
AC
K
Z0
FROM PCM
FILTER/CODER
SYSTEM CONTROLLER
PRI RS
F1
F0
SHD GKD
RD
TEST
ALARM
R
B3
RING
R
B1
K
1A
TIP
R
S1
C
S1
PTC
Z
1
PRIMARY
PROTECTION
K
2
K
1
5V
5V
K
IB
150V
PEAK
(MAX)
V
RING
R
S2
C
S2
RF
RFS
RING
TIP
PR
R
B2
V
B
-
C
5
K
RF
R
L2
SECONDARY
PROTECTION
(NOTE 8)
TO HYBRID
BALANCE
NETWORK
SLIC
HC-5509B
FIGURE 1. TYPICAL LINE CIRCUIT APPLICATION WITH THE MONOLITHIC SLIC
HC-5509B