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參數(shù)資料
| 型號(hào)： | STLC3055QTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| 中文描述： | 環(huán)路 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 153K |
| 代理商： | STLC3055QTR |
Name
Function
Formula
Typ. Value
CRD (6)
High frequency noise filter
100nF 10% 15VL
Q1
DC/DC converter switch P ch.
MOS transistor
RDS(ON)
≤
1.2
,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, t
RR
≤
50ns
SMBYW01-200
or equivalent
RSENSE
DC/DC converter peak current
limiting
RSENSE = 100mV/I
PK
110m
@I
PK
= 900mA
L (8)
DC/DC converter inductor
DC Resistance
≤
0.1
(9)
L=125
μ
H RFP1304PV
(Manuf.: All Inductive)
or SUMIDA CDRH125
or equivalent
CF1
DC/DC converter feedback loop
stability
220pF to470pF (10)
RF1
Negative battery programming
level
250K
<RF1<300K
(7)
300kW 1%
@ V
BATR
= -70V
9.1k
1%
RF2
Negative battery programming
level
(1) In case Zs=Zl, ZA and ZB can be replaced by two resistors of same value: RA=RB=|Zs|.
(2) In thiscase CTTX is justoperating 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+18
).
(4) CVpos should be defined depending on the power supply current capability and maximum allowable ripple.
(5) For low ripple application use 2x47
μ
F inparallel.
(6) Can be saved if proper PCB layout avoid noise coupling on RD pin (high impedance input).
(7) RF1 sets the selfgenerated battery voltage in RING and ACTIVE(Il=0) mode as follows:
267k
-46V
280k
-48V
294kW
300k
-50V
V
BAT(ACTIVE)
-49V
V
BATR(RING)
-62V
-65V
-68V
-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 loadconfiguration.
(8) Core: MICROMETALS T50-26C IRON POWDER, AL-VALUE 61nH/N2
Current rating:2A (50/60Hz)
Operating Temperature -25
°
to +60
°
Centigrades
Inductance: 14
μ
H +/-15% at1KHz, 1mA
DC resistance of winding: MAX.100 mOhm
Code: RFY1303
Wire: UEW2,0,60 mm
Turns: 50
Inductance (f=1KHz): >125
μ
H
(9) For high efficiency in HI-Z mode coil resistance @125kHz must be <3ohm
(10) Functionof thiscapacitor is to introducea zero atthe resonance frequency for loop stability.In case someparasitic 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 stabilityalready guaranteed by the parasitic resistance.
EXTERNAL COMPONENTS
(continued)
STLC3055
11/22
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