Announcements

Register now for the most anticipated Asia Pacific Power Seminar 2022

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Class D Audio Amplifier IC Forum Discussions

Audio-guru-CPH
Employee
5 solutions authored 25 sign-ins 10 replies posted
Employee

Can you kindly help with following questions, thanks.

Question 1

Part number MA12040, is the power supply of the gate driver of pins 57, 58, 60, 61, 62 and 63 a digital circuit?

Question 2

Start-up procedure
It is recommended to follow the start-up procedure as described below:
1) Make sure the all hardware pins are configured correctly: e.g. BTL, Slave Clock mode.
2) Keep the device in disable and mute: /ENABLE = 1; /MUTE = 0.
3) Bring up 5V VDD supply and PVDD supply (it does not matter if VDD or PVDD comes up first, provided that
the device is held in disable).
4) Wait for VDD and PVDD to be stable.
5) Enable device: /ENABLE = 0.
6) Program applicable initialization to registers.
7) Unmute device: /MUTE = 1.
😎 The device is now in normal operation state.

What happens if you don't follow the startup procedure!?

Thanks!.

0 Likes
1 Solution
Audio-guru-CPH
Employee
5 solutions authored 25 sign-ins 10 replies posted
Employee

Q1:

Pin 57,58,60,61,62 and 63 are in the digital domain, mainly digital supply for the gate driver circuitry and digital core. They should be treated as digital, and decoupling/layout should follow digital ground.

Please see. Page 15 in the MA12040 datasheet

Q2:

Mainly audio artefacts, such as loud pop noises in the loudspeaker, because of the device is not in mute state when powering up.

If the hardware state of e.g. BTL is not set correctly, the amplifier will not start up because of invalid state and/or protection circuitry kicking in.

Best regards,

Rasmus Meyer.

View solution in original post

0 Likes
1 Reply
Audio-guru-CPH
Employee
5 solutions authored 25 sign-ins 10 replies posted
Employee

Q1:

Pin 57,58,60,61,62 and 63 are in the digital domain, mainly digital supply for the gate driver circuitry and digital core. They should be treated as digital, and decoupling/layout should follow digital ground.

Please see. Page 15 in the MA12040 datasheet

Q2:

Mainly audio artefacts, such as loud pop noises in the loudspeaker, because of the device is not in mute state when powering up.

If the hardware state of e.g. BTL is not set correctly, the amplifier will not start up because of invalid state and/or protection circuitry kicking in.

Best regards,

Rasmus Meyer.

0 Likes