STLC3080 datasheet(9/23 Pages) STMICROELECTRONICS

9 / 23 page

Name

Function

Formula

Typical Value

RLIM (*)

Current limiting setting resistor

RLIM

= 103 ⋅

1.16

ILIM

23.2k

Ω ÷ 58kΩ

51.1k

Ω ±1%

RTH (**)

OFF/HOOK DETection threshold

setting resistor.

RTH

= 200 ⋅

1.16

ITH

21.1k

Ω ÷ 77.3kΩ

26.1k

Ω ±1%

CREV

Polarity reversal transition time

programming

CREV

∆VTR

∆T

3750

47nF for 5.67V/ms

RDA

OutputVolt ageDropAdjust ment

RDA

∆Drop ⋅ 20k

Ω

9.6

−∆Drop

10k

Ω (∆Drop = 3.2V) (2)

R1, R2

Power Cross Detection

240k

Ω

(3)

RTTX

Teletax Cancellation Resistor

RTTX = 12.5

⋅ [Re (ZLTTX)+2RP]

3.75k

Ω

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%

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.

(3) These resistors are needed to activate the power cross detection circuit, they should withstand the typical lighting voltage. If the power

cross detection is not needed R1, R2 can be avoided.

(*) RREF and RLIM should be connected close to the corresponding pins of STLC3080.

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 1.20 if the selected value of Ith is lower than 5mA.

Ω 1/4W ±1%

EXTERNAL COMPONENTS (continued)

STLC3080

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