PDF STLC3055N Data sheet ( Hoja de datos )

Número de pieza	STLC3055N
Descripción	WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT
Fabricantes	ST Microelectronics
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No Preview Available ! www.DataSheet4U.com STLC3055N WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT 1 FEATURES ■ MONOCHIP SLIC OPTIMISED FOR WLL & VoIP APPLICATIONS ■ IMPLEMENT ALL KEY FEATURES OF THE BORSHT FUNCTION ■ SINGLE SUPPLY (5.5 TO 12V) ■ BUILT IN DC/DC CONVERTER CONTROLLER ■ SOFT BATTERY REVERSAL WITH PROGRAMMABLE TRANSITION TIME. ■ ON-HOOK TRANSMISSION. ■ PROGRAMMABLE OFF-HOOK DETECTOR THRESHOLD ■ METERING PULSE GENERATION AND FILTER ■ INTEGRATED RINGING ■ INTEGRATED RING TRIP ■ PARALLEL CONTROL INTERFACE (3.3V LOGIC LEVEL) ■ PROGRAMMABLE CONSTANT CURRENT FEED ■ SURFACE MOUNT PACKAGE ■ INTEGRATED THERMAL PROTECTION ■ DUAL GAIN VALUE OPTION ■ BCD III S, 90V TECHNOLOGY ■ -40 TO +85°C OPERATING RANGE Figure 2. Block Diagram PD D0 D1 D2 Figure 1. Package TQFP44 Table 1. Order Codes Part Number STLC3055N E-STLC3055N () () ECOPACK® (see Section 9) Package TQFP44 TQFP44 2 DESCRIPTION The STLC3055N is a SLIC device specifically de- signed for WLL (Wireless Local Loop) and ISDN- Terminal Adaptors and VoIP applications. One of the distinctive characteristic of this device is the ability to operate with a single supply voltage (from +5.5V to +12V) and self generate the negative bat- tery by means of an on chip DC/DC converter con- troller that drives an external MOS switch. DET February 2006 GAIN SETTING TX RX ZAC1 ZAC RS ZB CKTTX CTTX1 CTTX2 FTTX INPUT LOGIC AND DECODER Status and functions AC PROC SUPERVISION OUTPUT LOGIC LINE DRIVER OUTPUT STAGE BGND TIP RING TTX PROC REFERENCE Vcc Vss Agnd DC PROC CREV CSVR DC/DC CONV. CLK RSENSE GATE VF VOLT. REG. Vbat CVCC VPOS VBAT RTTX CAC ILTF RD IREF RLIM RTH AGND Rev. 10 1/25 1 page STLC3055N Table 6 shows how to set the different SLIC operating modes. Table 6. SLIC Operating Modes. PD D0 D1 D2 Operating Mode 0 0 0 X Power Down 1 0 0 X H.I. Feeding (HI-Z) 1 0 1 0 Active Normal Polarity 1 0 1 1 Active Reverse Polarity 1 1 1 0 Active TTX injection (N.P.) 1 1 1 1 Active TTX injection (R.P.) 1 1 0 0/1 Ring (D2 bit toggles @ fring) 3.1 DC/DC Converter The DC/DC converter controller is driving an external power MOS transistor (P-Channel) in order to gen- erate the negative battery voltage needed for device operation. The DC/DC converter controller is synchronised with an external CLK (125KHz typ.)or with an internal clock generated when the pin CLK is connected to CVCC. One sensing resistor in series to Vpos supply allows to fix the maximum allowed input peak current. This feature is implemented in order to avoid over- load on Vpos supply in case of line transient (ex. ring trip detection). The typical value is obtained for a sensing resistor equal to 110mΩ that will guarantee an average current consumption from Vpos < 700mA. When in on-hook the self generated battery voltage is set to a pre- defined value. This value can be adjusted via one external resistor (RF1) and it is typical -50V. When RING mode is se- lected this value is increased to -70V typ. Once the line goes in off-hook condition, the DC/DC converter automatically adjust the generated battery voltage in order to feed the line with a fixed DC current (programmable via RLIM) optimising in this way the power dissipation. 3.2 OPERATING MODES 3.2.1 Power Down When this mode is selected the SLIC is switched off and the TIP and RING pins are in high impedance. Also the line detectors are disabled therefore the off-hook condition cannot be detected. This mode can be selected in emergency condition when it is necessary to cut any current delivered to the line. This mode is also forced by STLC3055N in case of thermal overload (Tj > 140°C). In this case the device goes back to the previous status as soon as the junction temperature decrease under the hysteresis threshold. No AC transmission is possible in this mode. 3.2.2 High Impedance Feeding (HI-Z) This operating mode is normally selected when the telephone is in on-hook in order to monitor the line status keeping the power consumption at the minimum. The output voltage in on-hook condition is equal to the self generated battery voltage (-50V typ). When off-hook occurs the DET becomes active (low logic level). 5/25 5 Page Table 10. External Components Name RRX RREF Function Rx input bias resistor Bias setting current CSVR Negative Battery Filter RD CAC Ring Trip threshold setting resistor AC/DC split capacitance Formula RREF = 1.3/Ibias Ibias = 50µA CSVR = 1/(2π ⋅ fp ⋅ 1.8MΩ) fp = 50Hz RD = 100/IRTH 2KΩ < RD < 5KΩ RP RLIM RTH CREV RDD CVCC CVpos CV CVB CRD (6) Q1 D1 Line protection resistor Current limiting programming Off-hook threshold programming (ACTIVE mode) Reverse polarity transition time programming Pull up resistors Internally supply filter capacitor Positive supply filter capacitor with low impedance for switch mode power supply Battery supply filter capacitor with low impedance for switch mode power supply High frequency noise filter High frequency noise filter DC/DC converter switch P ch. MOS transistor DC/DC converter series diode Rp > 30Ω RLIM = 1300/Ilim 32.5kΩ < RLIM < 65kΩ RTH = 290/ITH 27kΩ < RTH < 52kΩ CREV = ((1/3750) · ∆T/∆VTR) RDS(ON)≤1.2Ω,VDS = -100V Total gate charge=20nC max. with VGS=4.5V and VDS=1V ID>500mA Vr > 100V, tRR ≤ 50ns RSENSE DC/DC converter peak current limiting RSENSE = 100mV/IPK RF1 Negative battery programming level 250KΩ<RF1<300KΩ (7) RF2 Negative battery programming level L DC/DC converter inductor DC resistance ≤ 0.1Ω (8) Table 11. External Components @Gain Set = 0 Name RS ZAC ZA (1) ZB (1) Function Protection resistance image Two wire AC impedance SLIC impedance balancing network Line impedance balancing network Formula RS = 50 ⋅ (2Rp) ZAC = 50 ⋅ (Zs - 2Rp) ZA = 50 ⋅ Zs ZB = 50 ⋅ Zl STLC3055N Typ. Value 100kΩ 5% 26kΩ 1% 1.5nF 10% 100V 4.12kΩ 1% @ IRTH = 24mA 22µF 20% 15V @ RD = 4.12kΩ 50Ω 1% 52.3kΩ 1% @ Ilim = 25mA 32.4kΩ 1% @ITH = 9mA 22nF 10% 10V @ 12V/ms 100kΩ 100nF 20% 10V 100µF(4) 100µF 20% 100V (5) 470nF 20% 100V 100nF 10% 15V Possible choiches: IRF9510 or IRF9520 or IRF9120 or equivalent SMBYW01-200 or equivalent 110mΩ @IPK = 900mA 300kΩ 1% @ VBATR = -70V 9.1kΩ 1% L=100µH SUMIDA CDRH125 or equivalent Typ. Value 5kΩ @ Rp = 50Ω 25kΩ 1% @ Zs = 600Ω 30kΩ 1% @ Zs = 600Ω 30kΩ 1% @ Zl = 600Ω 11/25 11 Page

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