fault 管脚——如何防止功放POP声(7)

NTP系列,fault 管脚的作用

NeoFidelity, Inc.

Design Guide

NTP8XXX-001-R02

Consequently, as explained in the previous example, VFault voltage is less than the VT- (high to low threshold point of Schmitt trigger circuit in Table 1) so the output of NTP8xxx can be off when the supply, Power1, goes off abruptly, which is an abnormal case.

NTP系列,fault 管脚的作用

NeoFidelity, Inc.

Design Guide

NTP8XXX-001-R02

In summary, by exploiting a voltage divider circuit, high voltage can be applied to the /FAULT pin to shut down the output of NTP8xxx while avoiding pop noise in an abnormal power down mode.