STLC3080 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC3080' PDF : 23 Pages View PDF
STLC3080
EXTERNAL COMPONENTS (continued)
Name
RLIM (*)
Function
Current limiting setting resistor
Formula
RLIM
=
103
⋅
1.16
ILIM
23.2kΩ ÷ 58kΩ
Typical Value
51.1kΩ ±1%
RTH (**)
OFF/HOOK DETection threshold
setting resistor.
RT H
=
200
⋅
1.16
ITH
21.1kΩ ÷ 77.3kΩ
26.1kΩ ±1%
CREV
Polarity reversal transition time
programming
RDA
Out p utVolt ageDro pAdj ust ment
R1, R2
RT TX
CT TX
Power Cross Detection
Teletax Cancellation Resistor
Teletax Cancellation Capacitor
CREV =
K
∆VTR
;
K
=
1
3750
∆T
47nF for 5.67V/ms
∆Drop ⋅ 20kΩ
RDA = 9.6 − ∆Drop
RTTX = 12.5 ⋅ [Re (ZLTTX) + 2RP]
CT TX
=
(12.5
⋅
Im
1
(Z LT TX)
⋅
2π
⋅
fTTX)
10kΩ (∆Drop = 3.2V) (2)
240kΩ
(3)
3.75kΩ
20Ω 1/4W ±1%
RPT2
RPR2
D1
D2
CH
Protection resistor
Protection resistor
Overvoltage protection
Dual Battery Operation
Trans-Hybrid Loss Frequency
Compensation
≥ 8Ω
≥ 8Ω
CH = CCOMP
1N4448
1N4448
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 = 0Ω.
(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.
9/23
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