Transient voltage clamping circuit

摘要

A circuit for transient voltage clamping, the circuit being internal to a motor driver ASIC for a hard drive and including a power transistor for sinking a power supply voltage subjected to transient variation, a reference circuit for deriving a first reference voltage from a second reference voltage and the power supply voltage, and an amplifier circuit for receiving the first reference voltage as input and for driving the power transistor.