100 0:1

LOA D

Fault E ven t at LO AD

Inte gration &

Noise Filter

Sen sin g

Amp

IL+IF

IF

IL

HOT

NEUTRAL

AFE3010

VO ß IF

SCR

Drive

9

AFE3010

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Feature Description (continued)

Figure 8. AFE3010 Filter Scheme During Fault Conditions

Table 1. AFE3010 Response Time

FAULT CURRENT

FAULT RESPONSE TIME

mA

UL943 TIMING REQUIREMENTS (S)

AFE3010 TYPICAL RESPONSE

TIME (S)

> ±5

< 6.335

0.150

> ±10

<1.000

0.085

> ±30

< 0.371

0.040

> ±50

< 0.100

0.010

7.3.4 ALARM (LED) Driver

The AFE3010 ALARM pin can be used to drive an LED or a buzzer. Under normal system operation the ALARM

output remains low. During active operation, the ALARM signal generates a 3-KHz signal for the duration of

positive half of the power cycle and remains low for the duration of the negative half power cycle. Figure 9 shows

the ALARM signal scheme over a 60-Hz power line.