STLC3075 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STLC3075

Integrated POTS interface for home access gateway and WLL

STMicroelectronics 

Application information

STLC3075

Table 12. External components for flyback configuration

Name

Function

Formula

Typ. value

Flyback transformer 4W, turns ratio

T1 DC/DC converter transformer 1:8 for VPOS range from 8.5 V to

12 V

Tyco COEV MAGNETICS

MGPWG-00008

or Coilcraft FA2470-AL(5)

RF1

Negative battery

programming level

250 kΩ < RF1 < 300 kΩ(6)

300 kΩ 1% @ VBATR = -70 V

RF2

Negative battery

programming level

9.1 kΩ 1%

1. CVPOS should be defined depending on the power supply current capability and maximum allowable ripple.

2. For low ripple application use 2x47m F in parallel.

3. Can be saved if proper PCB layout avoid noise coupling on RD pin (high impedance input).

4. Coilcraft type FA2469-AL, Flyback transformer 4W, 1:16 with a VPOS range from 4.5V to 8.5V @ +20°C unless otherwise

specified. Also check Table 13 for further electrical specifications

5. Coilcraft type FA2470-AL, Flyback transformer 4W, 1:8 with a VPOS range from 8.5V to 12V @ +20°C unless otherwise

specified. Also check Table 14 for further electrical specifications

6. RF1 sets the self generated battery voltage in RING and ACTIVE(Il=0) mode as as shown in Table 11.

VBATR should be defined considering the ring peak level required (Vringpeak=VBATR - 6 V typ.). This relation is valid

providing that the VPOS power supply current capability and the RSENSE programming allow to source all the current

requested by the particular ringer load configuration.

Table 13. Coilcraft type FA2469-AL electrical specifications

Test description

Limit

Unit

Tol.

Notes

Inductance

Leakage inductance

DC resistance

DC resistance

Turns ratio

HI POT

0.0205

mH

0.414

uH

0.036

ohm

16.50

ohm

16:1

-

1.500

VAC

Max

Max

Max

Max

+/-4%

1-3, 10KHz, 100 mVmrs

1-3, 100KHz, 100 mVmrs

Short pins 4,6

1-3

4-6

(4-6):(1-3), 10KHz, 100mVAC

VDC to be applied for 1 second

from pins 1,3 to pins 4,6.

500μA max leakage current

Table 14. Coilcraft type FA2470-AL electrical specifications

Test description

Limit

Unit

Tol.

Notes

Inductance

0.0205

mH

Max 1-3, 10 kHz, 100 mVmrs

Leakage inductance

1-3, 100 kHz, 100 mVmrs

0.40

uH

Max

Short pins 4,6

DC resistance

0.036

ohm

Max 1-3

DC resistance

Turns ratio

7.92

ohm

Max 4-6

8:1

-

+/-3.3% (4-6):(1-3), 10 kHz, 100 mVAC

HI POT

1.500

VAC

VDC to be applied for 1 second

from pins 1,3 to pins 4,6.

500 µA max leakage current

20/36

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