Obsolete Product(s) - Obsolete Product(s)
EXTERNAL COMPONENTS
Name Function Formula Typical Value
R
REF
(*) Internal current reference programming
resistor
I
REF
=
1.16
R
REF
30.1kΩ ± 1%
C
SVR
Battery ripple rejection capacitance
C
SVR
=
1
2π
⋅
fp ⋅ 1.3MΩ
100nF ±10% 100V
@ fp = 1.22Hz
C
RT
Ring Trip capacitance C
RT
= (25/fring) ⋅ 470nF 470nF ±20% 6V
@ 25Hz
R
DC
DC sinthesized resistance
programming resistor
R
DC
= 5[R
feed
-2Rp]
R
DC
≥ 1kΩ
1.5kΩ ±1%
C
AC
AC/DC splitter capacitance
C
AC
=
1
2π ⋅ fsp ⋅ R
DC
10µF ±20% 15V
@ fsp = 10Hz
R
S
Protection resistor image R
S
= 25 ⋅ 2Rp 2.5kΩ ±1%
ZAC 2 wire AC impedance Z
AC
= 25[Zs - 2Rp] 12.5kΩ ±1%
ZA SLIC impedance balancing network ZA = 25 ⋅ Zs 15kΩ ±1%
ZB Line impedance balancing network ZB = 25 ⋅ Zl 15kΩ ±1%
C
COMP
AC feedback compensation
capacitance
C
COMP
=
2
2π ⋅ fo
[100
⋅ Rp]
220pF ±20%
@ fo = 250kHz
RS1 Sensing resistor for Ring Trip 1000 ⋅ RR 600kΩ ±0.5%
RS2 Sensing resistor for Ring Trip 1000 ⋅ RR 600kΩ ±0.5%
Q
EXT
External transistor (1) BD140, MJD32
RPT1 Line series resistor ≥20Ω 20W 1/4W
RPR1 Line series resistor ≥20Ω 20Ω 1/4W ±1%
R
LIM
(*) Current limiting setting resistor
R
LIM
= 10
3
⋅
1.16
I
LIM
; 26kΩ ÷ 64.9kΩ
51.1kΩ ±1%
R
SWITCH
(***)
Current limiting setting resistor
R
switch
[kΩ] =
24.4k
Ω ⋅
R
LIM
[kΩ]
R
LIM
[kΩ] − 24.4kΩ
47kΩ
R
TH
(**) OFF/HOOK DETection threshold
setting resistor.
R
TH
= 200 ⋅
1.16
I
TH
; 23.7kΩ ÷ 86.6kΩ
26.1kΩ ±1%
C
REV
Polarity reversal transition time
programming
C
REV
=
K
∆V
TR
∆T
;
K =
1
3750
47nF for 5.67V/ms
RDA Output Voltage Drop Adjustment
RDA =
∆Drop ⋅ 20k
Ω
9.6
− ∆Drop
10kΩ (∆Drop = 3.2V) (2)
R
TTX
Teletax Cancellation Resistor R
TTX
= 12.5 ⋅ [Re (ZL
TTX
) + 2R
P
]3.75kΩ
C
TTX
Teletax Cancellation Capacitor
C
TTX
=
1
(
12.5 ⋅ I
m
(ZL
TTX
) ⋅ 2π ⋅
f
TTX
)
RPT2 Protection resistor ≥ 8Ω
RPR2 Protection resistor ≥ 8Ω
D1 Overvoltage protection 1N4448
D2 Dual Battery Operation 1N4448
CH Trans-Hybrid Loss Frequency
Compensation
CH = CCOMP 220pF ±30%
C
VCC
Power Supply Filter 100nF ±20%
C
VB
Battery Supply Filter 100nF ±20% 100V
Notes:
(1) Transistor characteristics: h
FE
≥
25, I
C
≥
100mA, V
CEO
≥
60V, f
T
≥
15MHz. PDISS depends on application, see Appendix.
For SMD application possible alternatives are MJD350 in D-PACK or BCP53 in SOT223
(2) Typical value needed for 2.2Vrms metering pulse level, if no metering RDA = 0
Ω
.
(*) R
REF
and RLIM should be connected close to the corresponding pins of STLC30R80.
Avoid any digital line or high voltage swing line to pass close to I
REF
and R
LIM
pins. Eventually screen these pins with a GND track.
(**) Inside the formula the coefficient 1.16 must be changed to 1.2 if the selected value of I
Th
is lower than 5mA.
(***) This resistor must be used only in presence of REN number and short loop see description at page 5/13.
STLC30R80
7/13
