STLC3075_09 datasheet(20/36 Pages) STMICROELECTRONICS

20 / 36 page

Application information

STLC3075

20/36

DC/DC converter transformer

Flyback transformer 4W, turns ratio

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 k

Ω <RF1 < 300 kΩ(6)

300 k

Ω 1% @ V

BATR = -70 V

RF2

Negative battery

programming level

9.1 k

Ω 1%

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

For low ripple application use 2x47m F in parallel.

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

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

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

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 12.

External components for flyback configuration

Name

Function

Formula

Typ. value

Table 13.

Coilcraft type FA2469-AL electrical specifications

Test description

Limit

Unit

Tol.

Notes

Inductance

0.0205

Max

1-3, 10KHz, 100 mVmrs

Leakage inductance

0.414

Max

1-3, 100KHz, 100 mVmrs

Short pins 4,6

DC resistance

0.036

ohm

Max

1-3

DC resistance

16.50

ohm

Max

4-6

Turns ratio

16:1

+/-4%

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

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

Table 14.

Coilcraft type FA2470-AL electrical specifications

Test description

Limit

Unit

Tol.

Notes

Inductance

0.0205

Max

1-3, 10 kHz, 100 mVmrs

Leakage inductance

0.40

Max

1-3, 100 kHz, 100 mVmrs

Short pins 4,6

DC resistance

0.036

ohm

Max

1-3

DC resistance

7.92

ohm

Max

4-6

Turns ratio

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

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