What are Class D amps used for?
Class D amps, also known as “digital” amplifiers, work by shifting the sample frequency at which they operate up to extremely high frequencies. In doing so, they use MUCH smaller power transformers which takes up far less interior space—something that is always at a premium in subwoofers.
What is a class BD amp?
The Power bd amplifiers utilize a new class of operation called “Class BD”. Since this amplifier is a mono-block amplifier, it is designed for highest output into 2-ohm loads between the range of 20Hz to 250Hz.
What is the difference between Class D and linear amplifiers?
This difference gives Class D significant advantages in many applications because the lower power dissipation produces less heat, saves circuit board space and cost, and extends battery life in portable systems. Linear-amplifier output stages are directly connected to the speaker (in some cases via capacitors).
How much power is dissipated in an audio amplifier?
For an audio amplifier with 10-W PLOAD max, an average PLOAD of 1 W can be considered a realistic listening level. Under this condition, 282 mW is dissipated inside the Class D output stage, vs. 2.53 W for Class B and 30.2 W for Class A. In this case, the Class D efficiency is reduced to 78%—from 90% at higher power.
What frequency response do I need in an audio amplifier?
Audio frequencies range from about 20 Hz to 20 kHz, so the amplifier must have good frequency response over this range (less when driving a band-limited speaker, such as a woofer or a tweeter ).
Why do class AB amplifiers have significant power dissipation?
Unfortunately, even a well-designed class AB amplifier has significant power dissipation, because its midrange output voltages are generally far from either the positive or negative supply rails. The large drain-source voltage drops thus produce significant IDS × VDS instantaneous power dissipation.
