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TCM1520AP Datasheet(PDF) 5 Page - Texas Instruments |
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TCM1520AP Datasheet(HTML) 5 Page - Texas Instruments |
5 / 7 page TCM1520A RING DETECTOR SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 APPLICATION INFORMATION AC INPUT AC INPUT 5-V OUTPUT C FILTER COMMON 1 8 6 37 4 TCM1520A C2 = 10 µF, 50 V R1 = 2.2 k Ω VIrms = 40 V to 150 V, 15.3 Hz to 68 Hz R2 = 2.2 k Ω VID C1 = 0.47 µF, 350 V TIL181 To Isolated Output Figure 4. Isolated Configuration AC INPUT AC INPUT 5-V OUTPUT C FILTER COMMON 1 8 6 37 4 TCM1520A C2 = 10 µF, 50 V R1 = 2.2 k Ω VIrms = 40 V to 150 V, 15.3 Hz to 68 Hz 10 k Ω VID C1 = 0.47 µF, 350 V INVERTING OUTPUT Output 2 Figure 5. Nonisolated Configuration NOTE: See Table 1 for component functions. TABLE 1. COMPONENT FUNCTIONS COMPONENT FUNCTION R1 Limits current into SCR during high-voltage transients and aids in dial-pulse rejection. R2 Limits current into light-emitting diode. C1 Blocks dc-battery voltage in standby and aids in filtering dial pulses. Smaller values of C1 improve tapping immunity. C2 Stores energy from the ring signal to power the 5-V regulator. Optocoupler Provides ground and transient isolation between the host system and the telephone line. |
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