Circuit guards amplifier outputs against overvoltage

摘要

Auniversal requirement for automotive electronics isrnthat any device with direct connections to the wiring harness must be able to withstand shorts to the battery voltage. Though brutal, this requirement is necessary for reliability and for safety. One example of the need for this protection is an audio amplifier that produces indicator noises inrnthe automotive interior. Though operating from a voltage of 33 or 5V, which is lower than the battery voltage, the amplifier must be able to stand off the full battery voltage. You can also use a protection network appropriate for these amplifiers for other automotive circuits (Figure 1).