STLC3085 datasheet(18/28 Pages) STMICROELECTRONICS

18 / 28 page

Functional description

STLC3085

18/28

Name

Function

Formula

Typ. Value

CSVR

Negative Battery Filter

CSVR = 1/(2

π ⋅ fp ⋅ 1.8MΩ)

fp = 50Hz

1.5nF 10%

100V

Ring Trip threshold setting

resistor

RD = 100/IRTH

Ω < RD < 5KΩ

4.12k

Ω 1%

@ IRTH = 24mA

CAC

AC/DC split capacitance

µF 20% 15V

@ RD = 4.12k

Ω

Line protection resistor

Rp > 30

Ω

Ω 1%

RLIM

Current limiting programming

RLIM = 1300/Ilim

52.3k

Ω < RLIM < 65kΩ

52.3k

Ω 1%

@ Ilim = 25mA

RTH

Off-hook threshold programming

(ACTIVE mode)

RTH = 290/ITH

27k

Ω < RTH < 52kΩ

32.4k

Ω 1%

@ITH = 9mA

CREV

Reverse polarity transition time

programming

CREV = ((1/3750) ·

∆T/∆V

TR)

22nF 10% 10V

@ 12V/ms

RDD

Pull up resistors

100k

Ω

CVCC

Internally supply filter capacitor

100nF 20% 10V

CVpos(1)

Positive supply filter capacitor

with low impedance for switch

mode power supply

100

µF

CV(2)

Battery supply filter capacitor

with low impedance for switch

mode power supply

100

µF 20% 100V

CVB

High frequency noise filter

470nF 20% 100V

CRD(3)

High frequency noise filter

100nF 10% 15V

Fly-Back compensation

capacitor

2.2nF, 20%

CSF

Sense Filter capacitor

120pF, 20%

RSF

Sense Filter resistor

Ω

RSENSE

DC/DC converter peak current

limiting

RSENSE = 375mV/IPK

220m

Ω @I

PK = 1.7A

DC/DC converter switch Nchan

MOS transistor

RDS(ON)

≤0.05Ω,VDSS = 30V

VDG=30V, ID = 6.5A

Low threshold drive

STN4NF03L

or equivalent

DC/DC converter series diode

Vr > 350V, tRR ≤ 80ns

SMBYTW01-400

or equivalent

DC/DC Converter transformer

Fly-Back transformer 4W, Turns

Ratio 1:16 fro VPOS range from

4.5V to 8.5V

Tyco COEV MAGNETICS

MGPWG-00007

Name

Function

Formula

Typ. Value

Table 10.

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