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STLC3080 数据表(PDF) 8 Page - STMicroelectronics |
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STLC3080 数据表(HTML) 8 Page - STMicroelectronics |
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8 / 23 page  When a fault is detected the line current is limited in order to avoid any damage on the device itself and also on the external transistor. MISCELLANEOUS - Thermal overload: the integrated thermal pro- tection is activated when Tj reaches 150 °C typ.; the Slic is forced in Power-down mode, DET and AL are set Low. The RELR relay driver is turned off while it is still possible to control REL0 and REL1 through R0 and R1 inputs. - One low cost external transistor allows to re- duce the power dissipated in the SLIC itself al- lowing the use of extreme small size package (TQFP44). The external transistor size/package can be selected depending on the max. power requested by the particular application. - The SLIC supports loop start lines and gives the possibility to set loop current indicator threshold by means of one external resistor. EXTERNAL COMPONENTS LIST To set the SLIC into operation the following pa- rameters have to be defined: - The DC feeding resistance ”Rfeed” defined as the resistance of the traditional feeding sys- tem (most common Rfeed values are: 400, 800, 1000 ohm). - The AC SLIC impedance at line terminals ”Zs” to which the return loss measurements is re- ferred. It can be real (typ. 600 ohm) or com- plex. - The equivalent AC impedance of the line ”Zl” used for evaluation of the trans-hybrid loss performance (2/4wire conversion). It can be a complex impedance. - The value of the two protection resistors Rp in series with the line termination. - The reverse polarity transition time defined as ” ∆VTR/∆T”. - The constant current limit value ”Ilim”. - Rth: sets the OFF/Hook DETection threshold Once, the above parameters are defined, it is possible to calculate all the external components using the following table. EXTERNAL COMPONENTS Name Function Formula Typical Value CVCC Positive Supply Filter 100nF ±20% CVB Battery Supply Filter 100nF ±20% 100V 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 see Appendix D 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 RR Feeding resistance for Ring Injection ≥400Ω 600 Ω 2W RS1 Sensing resistor for Ring Trip 1000 ⋅ RR 600k Ω ±1% RS2 Sensing resistor for Ring Trip 1000 ⋅ RR 600k Ω ±1% RT Feeding resistance for Ring Injection ≥0Ω 0 Ω QEXT External transistor (1) BD140 RPT1 Line series resistor ≥20Ω RPR1 Line series resistor ≥20Ω 20 Ω 1/4W ±1% STLC3080 8/23 |
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