STLC3075(2005) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STLC3075
(Rev.:2005)

INTEGRATED POTS INTERFACE FOR HOME ACCESS GATEWAY AND WLL

STMicroelectronics 

STLC3075

Table 11. External Components for Fly-back configuration (continued)

Name

Function

Formula

RP Line protection resistor

Rp > 30Ω

RLIM Current limiting programming

RLIM = 1300/Ilim

32.5kΩ < RLIM < 65kΩ

RTH

Off-hook threshold programming RTH = 290/ITH

(ACTIVE mode)

27kΩ < RTH < 52kΩ

CREV Reverse polarity transition time

programming

CREV = ((1/3750) · ∆T/∆VTR)

RDD Pull up resistors

CVCC Internally supply filter capacitor

CVpos

Positive supply filter capacitor

with low impedance for switch

mode power supply

CV Battery supply filter capacitor with

low impedance for switch mode

power supply

CVB High frequency noise filter

CRD (6) High frequency noise filter

CZ Fly-Back compensation capacitor

CSF Sense Filter capacitor

RSF Sense Filter resistor

RSENSE DC/DC converter peak current

limiting

RSENSE = 375mV/IPK

Q1 DC/DC converter switch Nchan RDS(ON)≤0.05Ω,VDSS = 30V

MOS transistor

VDG=30V, ID = 6.5A

Low threshold drive

D1 DC/DC converter series diode Vr > 350V, tRR ≤ 80ns

T1 DC/DC Converter transformer Fly-Back transformer 4W, Turns

Ratio 1:16 fro VPOS range from

4.5V to 8.5V

T1 DC/DC Converter transformer Fly-Back transformer 4W, Turns

Ratio 1:8 fro VPOS range from

8.5V to 12V

RF1 Negative battery programming

level

250KΩ<RF1<300KΩ (7)

RF2 Negative battery programming level

Typ. Value

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

2.2nF, 20%

120pF, 20%

1kΩ

110mΩ

@IPK = 3.3A

STN4NF03L

or equivalent

SMBYTW01-400

or equivalent

Tyco COEV MAGNETICS

MGPWG-00007

Tyco COEV MAGNETICS

MGPWG-00008

300kΩ 1%

@ VBATR = -70V

9.1kΩ 1%

Table 12. External Components @Gain Set = 0

Name

Function

Formula

RS Protection resistance image

RS = 50 ⋅ (2Rp)

ZAC Two wire AC impedance

ZAC = 50 ⋅ (Zs - 2Rp)

ZA (1) SLIC impedance balancing network ZA = 50 ⋅ Zs

ZB (1) Line impedance balancing network ZB = 50 ⋅ Zl

CCOMP AC feedback loop compensation fo = 250kHz

CCOMP = 1/(2π⋅fo⋅100⋅(RP))

CH Trans-Hybrid Loss frequency

compensation

CH = CCOMP

RTTX (3) Pulse metering cancellation resistor RTTX = 50Re (Zlttx+2Rp)

Typ. Value

5kΩ @ Rp = 50Ω

25kΩ 1% @ Zs = 600Ω

30kΩ 1% @ Zs = 600Ω

30kΩ 1% @ Zl = 600Ω

120pF 10% 10V @ Rp = 50Ω

120pF 10% 10V

15kΩ @Zlttx = 200Ω real

12/26

Share Link: