any information about how the TD class amplifiers works?
ccaudle Hello,I have never heard that term. Any references to where it is used? Is it a marketing term that one particular company came up with?
TD class amplifier using a switching power amp in order to get more efficient amp
Class TD mean Transition D class type, its PSU are continuously variable but no into discrete steps.I don’t know if “Class TD” is a real thing. Class D certainly is. For while, Tripath (a company that has made a number of nice Class D amplifiers) used the term “Class T” in their marketing, but it was purely marketing - all the “Class T” amps were Class D.
I’m guessing that got further confused and turned into “Class TD” somewhere along the way.
More info here: https://en.wikipedia.org/wiki/Class-T_amplifier
Hi, do someone have any information about how the TD class amplifiers works? I have searching for this topic but I found nothing concrete about them.
Thanks in advance
opacheco
I written about this here before (perhaps search PMA70+). Back in the 80s I designed a small bedroom recording monitor amp that was only capable of 35W continuous, but used a variant capacitor doubler on each amplifier voltage rail so it could momentarily deliver well over 100W peaks on brief transients. I wasn't so arrogant as to invent a new amplifier class name to call it 🤔 but it effectively used a modulated rail voltage to deliver high short term peak power.The amplifier in the TD class consists of a conventional amplifier in the AB/B class with an SMPS +/- power supply whose output voltages are amplitude modulated by the input audio signal. That AM must be defined in such a way that the output voltage is always higher by 5-10V than the output voltage of the amplifier itself in the A/AB class. From a design point of view, the SMPS power supply is actually a class D amplifier and has high efficiency, so it can be concluded that the TD class does not give better performance compared to the A/AB class except for reduced heating, which gives it the best application in active or passive PA systems.
Imagine an amplifier with an IC 5534 that is powered by a +/- power supply of 317/337 that do not have a constant output voltage, but the voltage on the ADJ pin is determined by the input/output voltage of the 5534 using a PCM modulator.
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