Datasheet

+
330 kW 330 kW 330 kW
120 VAC
to 240 VAC
50/60 Hz
ZLLS410 or
Equivalent
ZLLS410 or
Equivalent
AVDD
3.3 V
ZC
IN
ZC
OUT
AV
DD
AGND
Zero
Crossing
Inside the AFE030
0.0
3.3
ZC
OUT
Time (5 ms/div)
0 50 100
350
0
-350
120 VAC to 240 VAC
50 Hz to 60 Hz
AFE030
SBOS588A –DECEMBER 2011– REVISED DECEMBER 2011 www.ti.com
Zero Crossing Detector Block
The AFE030 includes two zero crossing detectors. Zero crossing detectors can be used to synchronize
communications signals to the ac line or sources of noise. Typically, in single-phase applications, only a single
zero crossing detector is used. In three-phase applications, both zero crossing detectors can be used; one
component detects phase A, and one detects phase B. Phase C zero crossings can then be inferred from the
data gathered from the other phases. Figure 38 shows the AFE030 configured for non-isolated zero crossing
detection.
Figure 38. Non-Isolated Zero Crossing Detection Using the AFE030
Non-isolated zero crossing waveforms are shown in Figure 39.
Figure 39. Non-Isolated Zero Crossing Waveforms
32 Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): AFE030