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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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STLC30R80 Arkusz danych(PDF) 7 Page - STMicroelectronics |
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STLC30R80 Arkusz danych(HTML) 7 Page - STMicroelectronics |
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7 / 13 page  EXTERNAL COMPONENTS Name Function Formula Typical Value RREF (*) Internal current reference programming resistor IREF = 1.16 RREF 30.1k Ω ± 1% CSVR Battery ripple rejection capacitance CSVR = 1 2 π ⋅ fp ⋅ 1.3MΩ 100nF ±10% 100V @ fp = 1.22Hz CRT Ring Trip capacitance CRT = (25/fring) ⋅ 470nF 470nF ±20% 6V @ 25Hz RDC DC sinthesized resistance programming resistor RDC = 5[Rfeed -2Rp] RDC ≥ 1kΩ 1.5k Ω ±1% CAC AC/DC splitter capacitance CAC = 1 2 π ⋅ fsp ⋅ RDC 10 µF ±20% 15V @ fsp = 10Hz RS Protection resistor image RS = 25 ⋅ 2Rp 2.5k Ω ±1% ZAC 2 wire AC impedance ZAC = 25[Zs - 2Rp] 12.5k Ω ±1% ZA SLIC impedance balancing network ZA = 25 ⋅ Zs 15k Ω ±1% ZB Line impedance balancing network ZB = 25 ⋅ Zl 15k Ω ±1% CCOMP AC feedback compensation capacitance CCOMP = 2 2 π ⋅ fo[100 ⋅ Rp] 220pF ±20% @ fo = 250kHz RS1 Sensing resistor for Ring Trip 1000 ⋅ RR 600k Ω ±0.5% RS2 Sensing resistor for Ring Trip 1000 ⋅ RR 600k Ω ±0.5% QEXT External transistor (1) BD140, MJD32 RPT1 Line series resistor ≥20Ω 20W 1/4W RPR1 Line series resistor ≥20Ω 20 Ω 1/4W ±1% RLIM (*) Current limiting setting resistor RLIM = 103 ⋅ 1.16 ILIM ; 26k Ω ÷ 64.9kΩ 51.1k Ω ±1% RSWITCH (***) Current limiting setting resistor Rswitch [k Ω] = 24.4k Ω ⋅ RLIM [kΩ] RLIM [k Ω] − 24.4kΩ 47k Ω RTH (**) OFF/HOOK DETection threshold setting resistor. RTH = 200 ⋅ 1.16 ITH ; 23.7k Ω ÷ 86.6kΩ 26.1k Ω ±1% CREV Polarity reversal transition time programming CREV = K ∆VTR ∆T ; K = 1 3750 47nF for 5.67V/ms RDA Output Voltage Drop Adjustment RDA = ∆Drop ⋅ 20k Ω 9.6 − ∆Drop 10k Ω (∆Drop = 3.2V) (2) RTTX Teletax Cancellation Resistor RTTX = 12.5 ⋅ [Re (ZLTTX) + 2RP]3.75kΩ CTTX Teletax Cancellation Capacitor CTTX = 1 (12.5 ⋅ Im (ZLTTX) ⋅ 2π ⋅ fTTX) 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% CVCC Power Supply Filter 100nF ±20% CVB Battery Supply Filter 100nF ±20% 100V Notes: (1) Transistor characteristics: hFE ≥ 25, IC ≥ 100mA, VCEO ≥ 60V, fT ≥ 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. (*) RREF 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 IREF and RLIM 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 ITh 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 |
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