STLC30R80 datasheet(7/13 Pages) STMICROELECTRONICS

7 / 13 page

EXTERNAL COMPONENTS

Name

Function

Formula

Typical Value

RREF (*)

Internal current reference programming

resistor

IREF

1.16

RREF

30.1k

Ω ± 1%

CSVR

Battery ripple rejection capacitance

CSVR

⋅ fp ⋅ 1.3MΩ

100nF

±10% 100V

@ fp = 1.22Hz

CRT

Ring Trip capacitance

CRT = (25/fring)

⋅ 470nF

470nF

±20% 6V

@ 25Hz

RDC

DC sinthesized resistance

programming resistor

RDC = 5[Rfeed -2Rp]

RDC

≥ 1kΩ

1.5k

Ω ±1%

CAC

AC/DC splitter capacitance

CAC

π ⋅ fsp ⋅ RDC

µF ±20% 15V

@ fsp = 10Hz

Protection resistor image

RS = 25

⋅ 2Rp

2.5k

Ω ±1%

ZAC

2 wire AC impedance

ZAC = 25[Zs - 2Rp]

12.5k

Ω ±1%

SLIC impedance balancing network

ZA = 25

⋅ Zs

15k

Ω ±1%

Line impedance balancing network

ZB = 25

⋅ Zl

15k

Ω ±1%

CCOMP

AC feedback compensation

capacitance

CCOMP

π ⋅ fo[100 ⋅ Rp]

220pF

±20%

@ fo = 250kHz

RS1

Sensing resistor for Ring Trip

1000

⋅ RR

600k

Ω ±0.5%

RS2

Sensing resistor for Ring Trip

1000

⋅ RR

600k

Ω ±0.5%

QEXT

External transistor

(1)

BD140, MJD32

RPT1

Line series resistor

≥20Ω

20W 1/4W

RPR1

Line series resistor

≥20Ω

Ω 1/4W ±1%

RLIM (*)

Current limiting setting resistor

RLIM

= 103 ⋅

1.16

ILIM

; 26k

Ω ÷ 64.9kΩ

51.1k

Ω ±1%

RSWITCH

(***)

Current limiting setting resistor

Rswitch [k

Ω] =

24.4k

Ω

⋅ RLIM [kΩ]

RLIM [k

Ω] − 24.4kΩ

47k

Ω

RTH (**)

OFF/HOOK DETection threshold

setting resistor.

RTH

= 200 ⋅

1.16

ITH

; 23.7k

Ω ÷ 86.6kΩ

26.1k

Ω ±1%

CREV

Polarity reversal transition time

programming

CREV

∆VTR

∆T

; K

3750

47nF for 5.67V/ms

RDA

Output Voltage Drop Adjustment

RDA

∆Drop ⋅ 20k

Ω

9.6

− ∆Drop

10k

Ω (∆Drop = 3.2V) (2)

RTTX

Teletax Cancellation Resistor

RTTX = 12.5

⋅ [Re (ZLTTX) + 2RP]3.75kΩ

CTTX

Teletax Cancellation Capacitor

CTTX =

(12.5 ⋅ Im (ZLTTX) ⋅ 2π ⋅ fTTX)

RPT2

Protection resistor

≥ 8Ω

RPR2

Protection resistor

≥ 8Ω

Overvoltage protection

1N4448

Dual Battery Operation

1N4448

Trans-Hybrid Loss Frequency

Compensation

CH = CCOMP

220pF

±30%

CVCC

Power Supply Filter

100nF

±20%

CVB

Battery Supply Filter

100nF

±20% 100V

Notes:

(1) Transistor characteristics: hFE

≥ 25, IC ≥ 100mA, VCEO ≥ 60V, fT ≥ 15MHz. PDISS depends on application, see Appendix.

For SMD application possible alternatives are MJD350 in D-PACK or BCP53 in SOT223

(2) Typical value needed for 2.2Vrms metering pulse level, if no metering RDA = 0

Ω.

(*)

RREF and RLIM should be connected close to the corresponding pins of STLC30R80.

Avoid any digital line or high voltage swing line to pass close to IREF and RLIM pins. Eventually screen these pins with a GND track.

(**) Inside the formula the coefficient 1.16 must be changed to 1.2 if the selected value of ITh is lower than 5mA.

(***) This resistor must be used only in presence of REN number and short loop see description at page 5/13.

STLC30R80

7/13

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