M54123L

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

7 of 9

www.unisonic.com.tw

QW-R122-001,D

TYPICAL APPLICATION CIRCUIT

High-Speed Leakage Circuit Breaker With UTC M54123L

UTC M54123L

Trip

Coil

GND

AC

Line

ZCT

SCR (Note)

CR2AM

CR03AM

CRO2AM

Note: Gate current must be selected.

Please select voltage resistance by AC supply voltage

R2

1

2

4

5

6

7

3

8

C6

C4

AC

Line

C1

C2

C3

C5

R1

{

Note: The value of R1, R2, C4, and C5 should be chosen in order to keep at least 12V in Vs.

Please connect C4 (>1μF) and C2 (<1μF).

External capacitor C1 between pin 4 and GND is used for noise removal.

Please connect a varistor or a diode (2 pcs.) to ZCT in parallel, because of when large current is grounded in the

primary side (AC line) of ZCT, the following situation can be abandoned: The wave form in the secondary side of

ZCT is distorted and some signals do not appear in the output of amplifier.

Please connect capacitor (about 0.047μF) between pin 6 and pin 7.

Capacitor C6 between pin 1 and GND is about 0.047μF for removing noise.

170

30

7

5

3

1

100

50

Operating Time vs. Input Voltage

Input Voltage, V1 (mVrms)

10

300 500 1000

3

5

70

30

7

100

50

10

300

500

1000

Ta=25°C

60Hz