STLC3075_09 datasheet(17/36 Pages) STMICROELECTRONICS

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STLC3075

Application information

17/36

Table 10.

External components for buckboost 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% 10V @ 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% 100V (2)

CVB

High frequency noise filter

470 nF 20% 100 V

CRD(3)

High frequency noise filter

100 nF 10% 15 V

DC/DC converter switch P ch.

MOS transistor

RDS(ON)

≤1.2 Ω, VDS = -100 V

Total gate charge= 20 nC max.

with VGS=4.5 V and VDS=1 V

ID>500 mA

Possible choices:

IRF9510 or IRF9520 or

IRF9120 or equivalent

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

SMBYW01-200

or equivalent

RSENSE

DC/DC converter peak current

limiting

RSENSE = 100mV/IPK

110 m

Ω @ I

PK = 900 mA

RF1

Negative battery programming

level

250K

Ω < RF1 < 300KΩ(4)

300 k

Ω 1% @ V

BATR = -70 V

RF2

Negative battery programming

level

9.1 k

Ω 1%

DC/DC converter inductor

DC resistance

≤ 0.1 Ω(5)

L=100 µH

SUMIDA CDRH125 or equivalent

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