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Class D Switching Power Amplifiers and Power D/A conversion

Best class D amplifier board for 9 Volt supply
Best class D amplifier board for 9 Volt supply
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Old 17th July 2019, 08:57 PM   #1
goodlionaudio is online now goodlionaudio  United States
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Default Best class D amplifier board for 9 Volt supply

What are your recommendations for a class D amplifier board running off a 9 volt power supply?

There appears to be a gap between the 1 watt boards (5 volt supply) and the 20+ watt boards requiring >12 volt supply?

This is for an active speaker project with a single full range 8 ohm driver. Looking to obtain around 3 watt of high quality power output with no background noises. The max current delivery of the 9 volt (regulated) supply is 1 Amp.
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Old 17th July 2019, 09:51 PM   #2
Khron is offline Khron  Finland
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TPA3118's should be fine for that purpose, they're spec'd to work from 5V and up, and the small blue mono boards are tiny (~40% of a credit card) and sufficient for many usages (even guitar amps!).

9V should get you a clean 4-5W into 8ohms.

All the modding those need is removing one resistor, to drop the gain (and thus, noise) to minimum.
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Old 17th July 2019, 09:58 PM   #3
Turbowatch2 is offline Turbowatch2  Germany
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Amen.
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Old 17th July 2019, 10:16 PM   #4
goodlionaudio is online now goodlionaudio  United States
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Thank you for your advice, I will narrow my search down to mono TPA3118 boards.

There are many TPA3118 boards to choose from, on places like eBay, that all look alike. Are all of these products the same or are there quality differences? How do you recognize these differences?

Would a board without a heat-sink would be OK for this low power application inside a speaker box?
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Old 18th July 2019, 08:16 AM   #5
Yatsushiro is offline Yatsushiro  France
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Quote:
Originally Posted by goodlionaudio View Post
Would a board without a heat-sink would be OK for this low power application inside a speaker box?
The TPA3118 is a 'pad down' version of the TPA3116, in that it uses the PCB as a heatsink. It should be OK in a speaker cabinet.
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Old 18th July 2019, 12:16 PM   #6
Khron is offline Khron  Finland
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Quote:
Originally Posted by Yatsushiro View Post
The TPA3118 is a 'pad down' version of the TPA3116, in that it uses the PCB as a heatsink. It should be OK in a speaker cabinet.
... Especially considering the low voltage it's intended to run at

Going by the datasheet plots and doing some arithmetic, at 5W into 8ohm, we might be looking at >85% efficiency, so a measly 750mW of heat - that's diddly-squat

And that would be using a continuous sinewave; with music signals, it's gonna be idling at least half the time. Idle current's only spec'd in the datasheet at 12V the lowest, and quoted as a maximum 35mA, so let's say 30mA @ 9V, that's a quarter of a watt. In other words, pretty much nothing.
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Old 19th July 2019, 05:00 PM   #7
Mark Tillotson is offline Mark Tillotson
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TPA3130 is as far as I can tell a TPA3118 without a thermal pad, so whichever is cheaper of the 3130 or 3118 or 3116 would be the device to choose for low power (no heatsink) operation.
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Old 19th July 2019, 05:13 PM   #8
doctormord is offline doctormord  Germany
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A newer TPA3128D2 is happy with even less power using hybrid modulation mode. They're interchangable with the TPA3118 and boards. Afaik they changed the Mode-pin behaviour so hybrid is now standard, before it was BD.
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Old 19th July 2019, 06:55 PM   #9
Khron is offline Khron  Finland
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Well, the ready-made PBTL boards with TPA3118 can be found for under 2$ a piece, so...
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Old 19th July 2019, 10:02 PM   #10
doctormord is offline doctormord  Germany
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Correct, then swap the 3118 for 3128 by hotair.
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