STLC3075_09 datasheet(19/36 Pages) STMICROELECTRONICS

19 / 36 page

STLC3075

Application information

19/36

Table 12.

External components for flyback configuration

Name

Function

Formula

Typ. value

RRX

Rx input bias resistor

100 k

Ω 5%

RREF

Bias setting current

RREF = 1.3/Ibias; Ibias = 50 µA

26 k

Ω 1%

CSVR

Negative battery filter

CSVR = 1/(2

π ⋅ fp ⋅ 1.8 MΩ)

fp = 50 Hz

1.5 nF 10 % 100 V

Ring trip threshold setting

resistor

RD = 100/IRTH

Ω < RD < 5 kΩ

4.12 k

Ω 1% @ IRTH = 24 mA

CAC

AC/DC split capacitance

22 µF 20% 15 V @ RD = 4.12 k

Line protection resistor

Rp > 30

Ω 1%

RLIM

Current limiting programming

RLIM = 1300/Ilim

32.5 k

Ω < RLIM < 65 kΩ

52.3 k

Ω 1% @ Ilim = 25 mA

RTH

Off-hook threshold

programming (Active mode)

RTH = 290/ITH

27 k

Ω < RTH < 52 kΩ

32.4 k

Ω 1% @ I

TH = 9 mA

CREV

Reverse polarity transition

time programming

CREV = ((1/3750)·

ΔT/ΔV

TR)

22 nF 10% 10 V @ 12 V/ms

RDD

Pull up resistors

100 k

CVCC

Internally supply filter

capacitor

100 nF 20 % 10 V

CVPOS

Positive supply filter capacitor

with low impedance for switch

mode power supply

100 µF(1)

Battery supply filter capacitor

with low impedance for switch

mode power supply

100 µF 20 % 100 V(2)

CVB

High frequency noise filter

470 nF 20% 100 V

CRD(3)

High frequency noise filter

100 nF 10% 15 V

Flyback compensation

capacitor

2.2 nF, 20 %

CSF

Sense filter capacitor

120 pF, 20 %

RSF

Sense filter resistor

1 k

RSENSE

DC/DC converter peak

current limiting

RSENSE = 375 mV/IPK

220 m

Ω @ I

PK = 1.7 A

DC/DC converter switch N

channel MOS transistor

RDS(ON)

≤0.05 Ω,

VDSS = 30 V

VDG=30 V, ID = 6.5 A

Low threshold drive

STN4NF03L or equivalent

DC/DC converter series

diode

Vr > 350 V, tRR ≤ 80 ns

SMBYTW01-400 or equivalent

DC/DC converter transformer

Flyback transformer 4W, turns ratio

1:16 for VPOS range from 4.5 V to

8.5 V

Tyco COEV MAGNETICS

MGPWG-00007

or Coilcraft FA2469-AL(4)

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