their purpose is to protect against inductive kickback voltages (back-electromotive force, measured involts). Intrinsic Baker clamp diodes are incorporated into some modern MOSFET devices. Baker clamp diodes are also known as flyback and catching diodes.
(Catching Diodes / Baker Clamp Diodes)
A very simple and inexpensive protection option that is often overlooked is the installation of catching diodes. Fig 6.20 illustrates how catching diodes are incorporated into a typical OPS. Catching diodes are general-purpose diodes connected in a reverse-biased orientation from each power supply rail to the output rail. Their function is to suppress inductive back-EMF transients that can be generated from inductive speaker loads. In theory, these reverse-polarity kick-back transients can be as high as two times the power supply rail potential, presenting the risk of output device failure by primary voltage breakdown, In reality, this type of failure is not common in OPSs without catching diodes, but their implementation is so easy and cheap, why take the risk?
1N4005 diodes perform well for this purpose in amplifiers of 150 watts or less. In higher-power amplifiers, catching diodes should be rated at about 3 amps with a PIV of 400 volts
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