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STLC3055N Datasheet(PDF) 11 Page - STMicroelectronics |
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STLC3055N Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 25 page  11/25 STLC3055N Table 10. External Components Name Function Formula Typ. Value RRX Rx input bias resistor 100k Ω 5% RREF Bias setting current RREF = 1.3/Ibias Ibias = 50 µA 26k Ω 1% CSVR Negative Battery Filter CSVR = 1/(2 π ⋅ fp ⋅ 1.8MΩ) fp = 50Hz 1.5nF 10% 100V RD Ring Trip threshold setting resistor RD = 100/IRTH 2K Ω < RD < 5KΩ 4.12k Ω 1% @ IRTH = 24mA CAC AC/DC split capacitance 22 µF 20% 15V @ RD = 4.12k Ω RP Line protection resistor Rp > 30 Ω 50 Ω 1% RLIM Current limiting programming RLIM = 1300/Ilim 32.5k Ω < RLIM < 65kΩ 52.3k Ω 1% @ Ilim = 25mA RTH Off-hook threshold programming (ACTIVE mode) RTH = 290/ITH 27k Ω < RTH < 52kΩ 32.4k Ω 1% @ITH = 9mA CREV Reverse polarity transition time programming CREV = ((1/3750) · ∆T/∆VTR) 22nF 10% 10V @ 12V/ms RDD Pull up resistors 100k Ω CVCC Internally supply filter capacitor 100nF 20% 10V CVpos Positive supply filter capacitor with low impedance for switch mode power supply 100 µF(4) CV Battery supply filter capacitor with low impedance for switch mode power supply 100 µF 20% 100V (5) CVB High frequency noise filter 470nF 20% 100V CRD (6) High frequency noise filter 100nF 10% 15V Q1 DC/DC converter switch P ch. MOS transistor RDS(ON) ≤1.2Ω,VDS = -100V Total gate charge=20nC max. with VGS=4.5V and VDS=1V ID>500mA Possible choiches: IRF9510 or IRF9520 or IRF9120 or equivalent D1 DC/DC converter series diode Vr > 100V, tRR ≤ 50ns SMBYW01-200 or equivalent RSENSE DC/DC converter peak current limiting RSENSE = 100mV/IPK 110m Ω @IPK = 900mA RF1 Negative battery programming level 250K Ω<RF1<300KΩ (7) 300k Ω 1% @ VBATR = -70V RF2 Negative battery programming leve l9.1k Ω 1% L DC/DC converter inductor DC resistance ≤ 0.1Ω (8) L=100 µH SUMIDA CDRH125 or equivalent Table 11. External Components @Gain Set = 0 Name Function Formula Typ. Value RS Protection resistance image RS = 50 ⋅ (2Rp) 5k Ω @ Rp = 50Ω ZAC Two wire AC impedance ZAC = 50 ⋅ (Zs - 2Rp) 25k Ω 1% @ Zs = 600Ω ZA (1) SLIC impedance balancing network ZA = 50 ⋅ Zs 30k Ω 1% @ Zs = 600Ω ZB (1) Line impedance balancing network ZB = 50 ⋅ Zl 30k Ω 1% @ Zl = 600Ω |
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