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PDF STLC3055 Data sheet ( Hoja de datos )
| Número de pieza | STLC3055 | |
| Descripción | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT | |
| Fabricantes | ST Microelectronics | |
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® STLC3055
WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT
MONOCHIP SLIC OPTIMISED FOR WLL &
ISDN-TA APPLICATIONS
IMPLEMENT ALL KEY FEATURES OF THE
BORSHT FUNCTION
SINGLE SUPPLY (5.5 TO 15.8V)
BUILT IN DC/DC CONVERTER CONTROL-
LER.
SOFT BATTERY REVERSAL WITH PRO-
GRAMMABLE TRANSITION TIME.
ON-HOOK TRANSMISSION.
PROGRAMMABLE OFF-HOOK DETECTOR
THRESHOLD
METERING PULSE GENERATION AND FIL-
TER
INTEGRATED RINGING
INTEGRATED RING TRIP
PARALLEL CONTROL INTERFACE (3.3V
LOGIC LEVEL)
PROGRAMMABLE CONSTANT CURRENT
FEED
SURFACE MOUNT PACKAGE
INTEGRATED THERMAL PROTECTION
-40 TO +85°C OPERATING RANGE
BLOCK DIAGRAM
D0 D1 D2
TQFP44
ORDERING NUMBERS: STLC3055Q
STLC3055QTR
DESCRIPTION
The STLC3055 is a SLIC device specifically de-
signed for WLL (Wireless Local Loop) and ISDN-
Terminal Adaptors. One of the distinctive charac-
teristic of this device is the ability to operate with
a single supply voltage (from +5.5V to +15.8V)
and self generate the negative battery by means
of an on chip DC/DC converter controller that
drives an external MOS switch.
The battery level is properly adjusted depending
on the operating mode. A useful characteristic for
DET
September 2000
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
1/22
1 page  
STLC3055
The DC/DC converter controller is driving an ex-
ternal power MOS transistor (P-Channel) in order
to generate the negative battery voltage needed
for device operation.
The DC/DC converter controller is synchronised
with an external CLK (125KHZ typ.).
From version marked STLC3055 A5, it can be
synchronised to 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 overload on
Vpos supply in case of line transient (ex. ring trip
detection).
The typical value is obtained for a sensing resis-
tor equal to 110mΩ that will guarantee an aver-
age current consumption from Vpos < 700mA.
When in on-hook the self generated battery volt-
age is set to a predefined value.
This value can be adjusted via one external resis-
tor (RF1) and it is typical -50V. When RING mode
is selected this value is increased to -70V typ.
Once the line goes in off-hook condition, the
DC/DC converter automatically adjust the gener-
ated battery voltage in order to feed the line with
a fixed DC current (programmable via RLIM) opti-
mising in this way the power dissipation.
OPERATING MODES
Power Down
DC CHARACTERISTIC & SUPERVISION
When this mode is selected the SLIC is switched
off and the TIP and RING pins are in high imped-
ance. Also the line detectors are disabled there-
fore the off-hook condition cannot be detected.
This mode can be selected in emergency condi-
tion when it is necessary to cut any current deliv-
ered to the line.
This mode is also forced by STLC3055 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 de-
crease under the hysteresis threshold.
AC CHARACTERISTICS
The 2W port is set in high impedance, the TX
output buffer is a low impedance output, no AC
transmission is possible.
High Impedance Feeding (HI-Z)
DC CHARACTERISTIC & SUPERVISION
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).
The off-hook threshold in HI-Z mode is the same
value as programmed in ACTIVE mode.
The DC characteristic in HI-Z mode is just equal
to the self generated battery with 2x(1500W+Rp)
in series (see fig.1), where Rp is the external pro-
tection resistance.
Figure 1. DC Characteristic in HI-Z Mode.
IL
Vbat
2x(R1+Rp)
Slope: 2x(R1+Rp)
(R1=1500ohm)
VL
Vbat (-50V)
AC CHARACTERISTICS
The AC impedance shown at the 2W port
(TIP/RING) is the same as the DC one. The
TIP/RING AC impedance will be 2x(1500Ω + Rp)
or high impedance.
Active
DC CHARACTERISTICS & SUPERVISION
When this mode is selected the STLC3055 pro-
vides both DC feeding and AC transmission.
The STLC3055 feeds the line with a constant cur-
rent fixed by RLIM (20mA to 40mA range). The
on-hook voltage is typically 40V allowing on-hook
transmission; the self generated Vbat is -50V typ.
If the loop resistance is very high and the line
current cannot reach the programmed constant
current feed value, the STLC3055 behaves like a
40V voltage source with a series impedance
equal to the protection resistors 2xRp (typ.
2x41Ω) plus the internal resistance. Fig. 2 shows
the typical DC characteristic in ACTIVE mode.
5/22
5 Page 
STLC3055
EXTERNAL COMPONENTS (continued)
Name
CRD (6)
Q1
Function
High frequency noise filter
DC/DC converter switch P ch.
MOS transistor
D1 DC/DC converter series diode
RSENSE
L (8)
DC/DC converter peak current
limiting
DC/DC converter inductor
Formula
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 = 100mV/IPK
DC Resistance ≤ 0.1Ω (9)
CF1 DC/DC converter feedback loop
stability
RF1 Negative battery programming 250KΩ<RF1<300KΩ (7)
level
RF2 Negative battery programming
level
Typ. Value
100nF 10% 15VL
Possible choiches:
IRF9510 or IRF9520 or
IRF9120 or equivalent
SMBYW01-200
or equivalent
110mΩ
@IPK = 900mA
L=125µH RFP1304PV
(Manuf.: All Inductive)
or SUMIDA CDRH125
or equivalent
220pF to 470pF (10)
300kW 1%
@ VBATR = -70V
9.1kΩ 1%
(1) In case Zs=Zl, ZA and ZB can be replaced by two resistors of same value: RA=RB=|Zs|.
(2) In this case CTTX is just operating as a DC decoupling capacitor (fp=100Hz).
(3) Defining ZTTX as the impedance of RTTX in series with CTTX, RTTX and CTTX can also be calculated from the following formula:
ZTTX=50*(Zlttx+2Rp+18Ω).
(4) CVpos should be defined depending on the power supply current capability and maximum allowable ripple.
(5) For low ripple application use 2x47µF in parallel.
(6) Can be saved if proper PCB layout avoid noise coupling on RD pin (high impedance input).
(7) RF1 sets the self generated battery voltage in RING and ACTIVE(Il=0) mode as follows:
VBAT(ACTIVE)
VBATR(RING)
267kΩ
-46V
-62V
280kΩ
-48V
-65V
294kW
-49V
-68V
300kΩ
-50V
-70V
VBATR should be defined considering the ring peak level required (Vringpeak=VBATR-6V typ.).
The above relation is valid provided that the Vpos power supply current capability and the RSENSE programming allow to source all the
current requested by the particular ringer load configuration.
(8) Core: MICROMETALS T50-26C IRON POWDER, AL-VALUE 61nH/N2
Current rating: 2A (50/60Hz)
Operating Temperature -25° to +60° Centigrades
Inductance: 14µH +/-15% at 1KHz, 1mA
DC resistance of winding: MAX.100 mOhm
Code: RFY1303
Wire: UEW2, 0,60 mm
Turns: 50
Inductance (f=1KHz): >125µH
(9) For high efficiency in HI-Z mode coil resistance @125kHz must be <3ohm
(10) Function of this capacitor is to introduce a zero at the resonance frequency for loop stability. In case some parasitic resistance are already
present in the loop (Coil, CVBAT, PCB layout), the presence of this capacitor can degrade the device noise performances; in this case CF1
should be removed being the loop stability already guaranteed by the parasitic resistance.
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet STLC3055.PDF ] | |
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