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Class D Switching Power Amplifiers and Power D/A conversion

L30D IRS2092 IRFB 4227  IRAUDAMP9 MYDIY
L30D IRS2092 IRFB 4227  IRAUDAMP9 MYDIY
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Old 10th January 2016, 02:46 PM   #21
Lo_Tse is offline Lo_Tse  Canada
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Originally Posted by ljm_ljm View Post
Thanks!
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Old 23rd January 2016, 01:43 PM   #22
ljm_ljm is offline ljm_ljm  China
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Originally Posted by Buehgemeiste View Post
i looked L30D up on aliexpress and found this:
L30D/300 850W Single Channel Digital Finished Amplifier Board IRS2092 IRFB4227 IRAUDAMP9-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
is TZT an authorized seller?
the description says Vmin is +-60V.
how bad would +-50V be?
+ -50VDC Will not work.
I've tested + - 68 v. Can't work stable.

Show the blue flashing LED, sound increases, will go out.


Voltage increase to + 75-75 - v or + v. LED does not shine. Sound and stable.
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Old 23rd January 2016, 01:45 PM   #23
ljm_ljm is offline ljm_ljm  China
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I recommend to modify L30D voltage.

Recommend 75 v - DC 85 v DC(+ -)
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Old 24th January 2016, 03:33 AM   #24
ljm_ljm is offline ljm_ljm  China
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If change k1 resistance 5k1 to 3k9 2w. So can work stable in + - 65 v voltage.

From now on I will change by default. So can stable compatible between 60 v to 80 v voltage.
So, voltage range does not change (60-80 - v DC)
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Old 30th January 2016, 07:52 AM   #25
ljm_ljm is offline ljm_ljm  China
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If the power supply voltage is lower than + - 75 - v.

Can try to put 2 k2 resistor in parallel 2 k2 resistance.

Get 1 k1 resistance, power is greater than 3 w.
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Old 2nd February 2016, 05:27 AM   #26
Greg32 is offline Greg32  Australia
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I had to decrease the value of the 2k2 to 1k8 to make this amp work on 75+0-75. also increased the osc frequency to 285khz and it sounds much nicer.
ljm what is the max frequency you recommend?
Greg
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Old 2nd February 2016, 12:06 PM   #27
Lo_Tse is offline Lo_Tse  Canada
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Quote:
Originally Posted by ljm_ljm View Post
If change k1 resistance 5k1 to 3k9 2w. So can work stable in + - 65 v voltage.

From now on I will change by default. So can stable compatible between 60 v to 80 v voltage.
So, voltage range does not change (60-80 - v DC)
Ljm,

Have you made these changes (i.e. 5k1 to 3k9 and halfing the 2k2 resistor value) to your boards in your store yet?
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Old 3rd February 2016, 12:59 PM   #28
ljm_ljm is offline ljm_ljm  China
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Originally Posted by Greg32 View Post
I had to decrease the value of the 2k2 to 1k8 to make this amp work on 75+0-75. also increased the osc frequency to 285khz and it sounds much nicer.
ljm what is the max frequency you recommend?
Greg
Don't go to adjust the frequency.

Although L30D frequency is lower than L15D doubled, but filter capacitance can be twice.
L30D 1 UF, L15D 0.47 UF.

So their filtering performance is the same. L30D 210K =L15D 430 k

Low frequency will have a better efficiency, less heat.
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Old 3rd February 2016, 01:02 PM   #29
ljm_ljm is offline ljm_ljm  China
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Originally Posted by Lo_Tse View Post
Ljm,

Have you made these changes (i.e. 5k1 to 3k9 and halfing the 2k2 resistor value) to your boards in your store yet?
After my test.
Only need to change a resistor. 2 k2 in parallel can be completely stable working above> + - 50 v voltage.

Of course recommended voltage is still 60-80 DC+-v.
From 10 days ago, all L30D in this way.

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Old 3rd February 2016, 07:23 PM   #30
Greg32 is offline Greg32  Australia
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Quote:
Originally Posted by ljm_ljm View Post
Don't go to adjust the frequency.

Although L30D frequency is lower than L15D doubled, but filter capacitance can be twice.
L30D 1 UF, L15D 0.47 UF.

So their filtering performance is the same. L30D 210K =L15D 430 k

Low frequency will have a better efficiency, less heat.
Iraudamp 9 schematic recommend 300khz frequency, and they have 2.2uf in output filter, double what you have. my tests at 285khz have less heat in inductor and much better sound quality in the upper mid to high range. heatsink temperature is the same. Greg
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