STLC3085 datasheet(17/28 Pages) STMICROELECTRONICS

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STLC3085

Functional description

17/28

Name

Function

Formula

Typ. Value

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

32.5k

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

DC/DC converter switch P ch.

MOS transistor

RDS(ON)

≤1.2Ω,VDS = -100V

Total gate charge=20nC max.

with VGS=4.5V and VDS=1V

ID>500mA

Possible choiches:

IRF9510 or IRF9520 or

IRF9120 or equivalent

DC/DC converter series diode

Vr > 100V, tRR ≤ 50ns

SMBYW01-200

or equivalent

RSENSE

DC/DC converter peak current

limiting

RSENSE = 100mV/IPK

130m

Ω

@IPK = 770mA

RF1

Negative battery programming

level

250K

Ω<RF1<270KΩ

270k

Ω 1%

@ VBATR = -64V

RF2

Negative battery programming

level

9.1k

Ω 1%

L(4)

DC/DC converter inductor

DC resistance

≤ 0.1Ω

L=100

µH

SUMIDA CDRH125 or equivalent

FLY-BACK CONFIGURATION

RREF

Bias setting current

RREF = 1.3/Ibias; Ibias = 50

µA

26k

Ω 1%

Table 10.

External Components (continued)

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