TCM1520A Datasheet, PDF (5/7 Pages) Texas Instruments – RING DETECTOR

TCM1520A
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
APPLICATION INFORMATION
VIrms = 40 V to 150 V,
15.3 Hz to 68 Hz
C1 = 0.47 µF,
350 V
1
R1 = 2.2 kΩ
VID
TCM1520A
AC
INPUT
5-V OUTPUT ⁴
8 _AC
INPUT
6
C FILTER
C2 = 10 µF,
50 V
COMMON
3
7
TIL181
To Isolated
Output
R2 = 2.2 kΩ
Figure 4. Isolated Configuration
VIrms = 40 V to 150 V,
15.3 Hz to 68 Hz
C1 = 0.47 µF,
350 V
1
R1 = 2.2 kΩ
VID
TCM1520A
AC
INPUT
4
5-V OUTPUT
8 _AC
INPUT
INVERTING 2
OUTPUT
6
C FILTER
C2 = 10 µF,
50 V
COMMON
3
7
10 kΩ
Output
Figure 5. Nonisolated Configuration
NOTE: See Table 1 for component functions.
COMPONENT
R1
R2
C1
C2
Optocoupler
TABLE 1. COMPONENT FUNCTIONS
FUNCTION
Limits current into SCR during high-voltage transients and aids in dial-pulse rejection.
Limits current into light-emitting diode.
Blocks dc-battery voltage in standby and aids in filtering dial pulses. Smaller values of C1
improve tapping immunity.
Stores energy from the ring signal to power the 5-V regulator.
Provides ground and transient isolation between the host system and the telephone line.
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