LMG1205: Class D Power Amplifier Design Issues

JIA-HUA GU

Part Number: LMG1205

The currently designed sonar works at 1MHz class D power amplifier, and the power required by the probe is 400w.
But the voltage became smaller after I filtered, I don't know if there is a way to solve it.
Do I only need to give the input voltage during EPC2001 simulation? Do I need to provide additional input current?

circuit

over 1 year ago

0 Ethan Galloway over 1 year ago

TI__Genius 9570 points

Hello Jia,

I got a few questions for you to help me understand the simulation.

Can you see LO and HO switching?

Do you have the HS label in your circuit connected to the HS pin? I can't find a connection between the HS label on the FETs and the HS pin on the driver.

Best Regards,
Ethan Galloway

0 JIA-HUA GU over 1 year ago in reply to Ethan Galloway

Prodigy 90 points

I forgot to connect HS.

This is the output of LO and HO.

0 Ethan Galloway over 1 year ago in reply to JIA-HUA GU

TI__Genius 9570 points

Hi Jia,

Good to see the simulation working now.

I see HO is drooping during the high side pulses. If the circuit is not working as intended, you may want to increase the capacitance of the bootstrap capacitor.

If you don't have any more questions, I'm going to mark this thread as resolved to help with our bookkeeping.

Regards,
Ethan Galloway

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LMG1205: Class D Power Amplifier Design Issues