I am using a Class D amplifier TPA2000D1 to amplify my signal. I built the circuit according to the application circuit as shown in the datasheet. I applided a 0.4Vp-p Sine wave at the input. At the output, I have a 1Vp-p square wave output with ALOT of ripples.

Using a gain of 6dB, I realised that the input/output voltages do not match. Also, why does my output have so much ripples and is a square wave even though the datasheet says that there is no need for a low pass filter at the output?

 

Hello,

Can you post the used schematic?

Greetings,
Bertus

 

Hello, thanks for replying. I've attached the schematic. But because my input is from a waveform generator, i've grounded pins INN and OUTN. And basically my output waveform is very messy.

 

Do you have access to a one-to-one audio transformer? If so, you can use it to isolate the single-ended function generator by passing the signal through the transformer.

hgmjr

 

Seems to me that you mistakenly connect OUTN to GND.
This circuit works only in "bridge" mode.

 

Hello,

As jony130 says, the amplifier must be driven in "bridge" mode.
This means that the two inputs (INP and INN) get signals that are 180 ° out of phase.
The speaker must be connected to the OUTP and OUTN connections.

Greetings,
Bertus