E-STLC3085 Просмотр технического описания (PDF) - STMicroelectronics

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E-STLC3085

Integrated Pots Interface for Home Access Gateway and WLL

STMicroelectronics 

STLC3085

Functional description

Table 10. External Components (continued)

Name

Function

Formula

RD

Ring Trip threshold setting

resistor

RD = 100/IRTH

2KΩ < RD < 5KΩ

CAC AC/DC split capacitance

RP Line protection resistor

Rp > 30Ω

RLIM Current limiting programming

RLIM = 1300/Ilim

32.5kΩ < RLIM < 65kΩ

RTH

Off-hook threshold programming RTH = 290/ITH

(ACTIVE mode)

27kΩ < RTH < 52kΩ

CREV

Reverse polarity transition time

programming

CREV = ((1/3750) · ∆T/∆VTR)

RDD Pull up resistors

CVCC Internally supply filter capacitor

Positive supply filter capacitor

CVpos(1) with low impedance for switch

mode power supply

CV(2)

Battery supply filter capacitor

with low impedance for switch

mode power supply

CVB High frequency noise filter

CRD(3) High frequency noise filter

RDS(ON)≤1.2Ω,VDS = -100V

DC/DC converter switch P ch. Total gate charge=20nC max.

Q1

MOS transistor

with VGS=4.5V and VDS=1V

ID>500mA

D1 DC/DC converter series diode Vr > 100V, tRR ≤ 50ns

RSENSE

DC/DC converter peak current

limiting

RSENSE = 100mV/IPK

RF1

Negative battery programming

level

250KΩ<RF1<270KΩ

RF2

Negative battery programming

level

L(4) DC/DC converter inductor

DC resistance ≤ 0.1Ω

FLY-BACK CONFIGURATION

RREF Bias setting current

RREF = 1.3/Ibias; Ibias = 50µA

Typ. Value

4.12kΩ 1%

@ IRTH = 24mA

22µF 20% 15V

@ RD = 4.12kΩ

50Ω 1%

52.3kΩ 1%

@ Ilim = 25mA

32.4kΩ 1%

@ITH = 9mA

22nF 10% 10V

@ 12V/ms

100kΩ

100nF 20% 10V

100µF

100µF 20% 100V

470nF 20% 100V

100nF 10% 15V

Possible choiches:

IRF9510 or IRF9520 or

IRF9120 or equivalent

SMBYW01-200

or equivalent

130mΩ

@IPK = 770mA

270kΩ 1%

@ VBATR = -64V

9.1kΩ 1%

L=100µH

SUMIDA CDRH125 or equivalent

26kΩ 1%

17/28

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