AFE032 datasheet(65/77 Pages) TI1

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AFE032

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SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

Table 79 and Table 80 list several recommended transient protection components.

Table 79. Recommended Transient Protection Devices (120 VAC, 60 Hz)

COMPONENT

DESCRIPTION

MANUFACTURER

MFR PART NO (OR EQUIVALENT)

Zener diode

Diodes, Inc.

1SMB59xxB(1)

D2, D3

Schottky diode

Diodes, Inc.

B340A

TVS

Transient voltage suppressor

Littelfuse, Inc.

SMCJxxCA(2)

MOV

Varistor

Littelfuse, Inc.

TMOV20RP140E

HV capacitor

High-voltage capacitor

Illinois Capacitor, Inc

474MKP275KA(3)

(1)

Select the zener breakdown voltage at the lowest available rating beyond the normal power-supply operating range. For example,

1SMB5931B is suitable for systems where PA_VS = 15 V, whereas 1SMB5934B is suitable for systems where PA_VS = 20 V.

(2)

Select the TVS breakdown voltage at or slightly less than (0.5 × PA_VS). For example, SMCJ6.0CA is suitable for systems where

PA_VS = 15 V, whereas SMCJ8.0CA is suitable for systems where PA_VS = 20 V.

(3)

A common value for the high-voltage capacitor is 470 nF. Other values may be substituted depending on the appliction requirements.

Note that when making a substitution, for reliability, the capacitor must be selected from the same family or an equivalent family of

capacitors rated to withstand high-voltage surges on the power line.

Table 80. Recommended Transient Protection Devices (240 VAC, 50 Hz)

COMPONENT

DESCRIPTION

MANUFACTURER

MFR PART NO (OR EQUIVALENT)

Zener diode

Diodes, Inc.

1SMB59xxB(1)

D2, D3

Schottky diode

Diodes, Inc.

B340A

TVS

Transient voltage suppressor

Littelfuse, Inc.

SMCJxxCA(2)

MOV

Varistor

Littelfuse, Inc.

TMOV20RP300E

HV capacitor

High-voltage capacitor

Illinois Capacitor, Inc

474MKP275KA(3)

(1)

Select the zener breakdown voltage at the lowest available rating beyond the normal power-supply operating range. For example,

1SMB5931B is suitable for systems where PA_VS = 15 V, whereas 1SMB5934B is suitable for systems where PA_VS = 20 V.

(2)

Select the TVS breakdown voltage at or slightly less than (0.5 × PA_VS). For example, SMCJ6.0CA is suitable for systems where

PA_VS = 15 V, whereas SMCJ8.0CA is suitable for systems where PA_VS = 20 V.

(3)

A common value for the high-voltage capacitor is 470 nF. Other values may be substituted depending on the appliction requirements.

Note that when making a substitution, for reliability, the capacitor must be selected from the same family or an equivalent family of

capacitors rated to withstand high-voltage surges on the power line.

THERMAL CONSIDERATIONS

In a typical power-line communications application, the device dissipates 2 W of power when transmitting to the

low-impedance ac line. This amount of power dissipation can increase the junction temperature, which in turn

can lead to a thermal overload that results in signal transmission interruptions if the PCB thermal design is not

implemented properly. Proper management of heat flow from the device as well as good PCB design and

construction are required to ensure proper device temperature, maximize performance, and extend device

operating life.

The device is assembled in a 7-mm x 7-mm, QFN-48 package. As Figure 29 shows, this QFN package has a

large-area exposed thermal pad on the underside that is used to conduct heat away from the device and to the

underlying PCB.

Figure 29. QFN Package with Large-Area Exposed Thermal Pad

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