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OPA521

SBOS872 – MAY 2018

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(1)

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

1SMB5931B is designed for systems where PA_VS = 15 V, whereas 1SMB5934B is designed 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 designed for systems where

PA_VS = 15 V, whereas SMCJ8.0CA is designed 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 application requirements.

When making a substitution, 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 for reliability.

Table 2 and Table 3 list several recommended transient protection components.

Table 2. Recommended Transient Protection Devices (120 VAC, 60 Hz)

COMPONENT

DESCRIPTION

MANUFACTURER

MFR PART NO. (OR

EQUIVALENT)

D1

Zener diode

TBD

D2, D3

Schottky diode

TBD

B340A

TVS

Transient voltage suppressor

TBD

MOV

Varistor

Littelfuse, Inc.

TMOV20RP140E

HV capacitor

High-voltage capacitor

Illinois Capacitor, Inc

(1)

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

1SMB5931B is designed for systems where PA_VS = 15 V, whereas 1SMB5934B is designed 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 designed for systems where

PA_VS = 15 V, whereas SMCJ8.0CA is designed 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 application requirements.

When making a substitution, 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 for reliability.

Table 3. Recommended Transient Protection Devices (240 VAC, 50 Hz)

COMPONENT

DESCRIPTION

MANUFACTURER

MFR PART NO (OR EQUIVALENT)

D1

Zener diode

TBD.

D2, D3

Schottky diode

TBD

TBD

TVS

Transient voltage suppressor

TBD

MOV

Varistor

Littelfuse, Inc.

TMOV20RP300E

HV capacitor

High-voltage capacitor

Illinois Capacitor, Inc