AFE032 datasheet(64/77 Pages) TI1

64 / 77 page

Phase

Neutral

Low-Voltage

Capacitor

High-Voltage

Capacitor

Power

Amplifier

MOV

TVS

Power Supply

Device

AFE032

SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

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CIRCUIT PROTECTION

Power-line communications are often located in operating environments that are harsh for electrical components

connected to the ac line. Noise or surges from electrical anomalies (such as lightning, capacitor bank switching,

inductive switching, or other grid fault conditions) can damage high-performance integrated circuits if proper

protection is not provided. The AFE032, however, can survive even the harshest conditions by using a variety of

techniques to protect the device.

Layout the protection circuitry in order to dissipate as much of the electrical disturbance as possible with a multi-

layer approach using metal-oxide varistors (MOVs), transient voltage suppression diodes (TVSs), Schottky

diodes, and a Zener diode. These components dissipate the electrical disturbance before the anomaly reaches

the device. Figure 28 shows the recommended strategy for transient overvoltage protection.

Figure 28. Transient Overvoltage Protection for AFE032

Note that the high-voltage coupling capacitor must be able to withstand pulses up to the clamping protection

provided by the MOV. A metalized polypropylene capacitor, such as the 474MKP275KA from Illinois Capacitor™,

is rated for 50 Hz to 60 Hz and 250 VAC to 310 VAC, and can withstand 24 impulses of 2.5 kV.

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AFE032 Datasheet(PDF) 64 Page - Texas Instruments