AN1042/D High Fidelity Switching Audio
Amplifiers Using TMOS Power
MOSFETs
Prepared by: Donald E.
Pauly ON Semiconductor Special Consultant http://onsemi.
com
APPLICATION NOTE
With the introduction of complementary bipolar power transistors in the late 1960s, switching
amplifiers became theoretically practical.
At low frequencies, bipolar transistors have switching efficiencies of 99% and will directly drive a low impedance speaker filter.
The requirement for switching frequencies above 100 kHz resulted in excessive losses however.
Bipolar drive circuitry was also complex because of its large base current requirement.
With the advent of complementary (
voltage/current ratings) TMOS power MOSF...