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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th October 2020, 09:49 AM   #2841
drMordor is offline drMordor  Russian Federation
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Resistor 3-10k
No need film caps, need MLCC
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Old 20th October 2020, 10:28 AM   #2842
saran008 is online now saran008  Singapore
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Quote:
Originally Posted by drMordor View Post
Resistor 3-10k
No need film caps, need MLCC
Thanks for the guidance Doc.

Any brand/value for MLCCs?
any thumb rule for calculation?

if I use 22000uf x4 will it be overkill? any negative effect?
SLPX223M050H9P3 | Cornell-Dubilier 22000μF Electrolytic Capacitor 50V dc, Through Hole - SLPX223M050H9P3 | RS Components

FYI My SMPS is below link, customized for Single 42V.

GHXAMP HIFI Switch Power Supply Dual DC 24V 48V 60V 80V 300 500W Power Supply Board With Heat Sink For Low power Amplifier 1pc|Amplifier| - AliExpress
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Old 20th October 2020, 12:17 PM   #2843
drMordor is offline drMordor  Russian Federation
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Any brand/value for MLCCs?
Any, 100V 1-10uf
Quote:
if I use 22000uf x4 will it be overkill? any negative effect?
No need add caps for SMPS.
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Old Yesterday, 01:00 AM   #2844
saran008 is online now saran008  Singapore
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Originally Posted by drMordor View Post
No need add caps for SMPS.
Ok Doc. thanks for the clarification.
If I add caps, will it have any negative effect?
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Old Yesterday, 03:26 AM   #2845
drMordor is offline drMordor  Russian Federation
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Need to listen)
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Old Yesterday, 03:38 AM   #2846
opc is offline opc  Canada
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TPA3255 - all about DIY, Discussion, Design etc.
Quote:
Originally Posted by saran008 View Post
Ok Doc. thanks for the clarification.
If I add caps, will it have any negative effect?
Depends on the power supply... too much capacitance can impact the OCP or startup of the SMPS, causing a "hiccup" where the supply will try to start, charge the added caps, then go into OCP, and get stuck in a cycle of perpetually trying to start up.

Also, an SMPS does not work the way a traditional linear supply does. They generally use feedback for regulation, so they don't need massive banks of caps to maintain good regulation. Adding capacitance to a typical SMPS it likely to cause more problems than it will solve.

Regards,
Owen
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Old Yesterday, 03:40 AM   #2847
drMordor is offline drMordor  Russian Federation
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Depends on the power supply
+100500
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Old Yesterday, 03:51 AM   #2848
saran008 is online now saran008  Singapore
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Originally Posted by drMordor View Post
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Quote:
Originally Posted by opc View Post
Depends on the power supply... Adding capacitance to a typical SMPS it likely to cause more problems than it will solve.
Thanks Doc & Owen. Anyway I already ordered the pcb.
once I receive the pcb, will check the lead spacing, order the caps (22k uf x 1 first and check)
is this 22000 uf model ok?

SLPX223M050H9P3 | Cornell-Dubilier 22000μF Electrolytic Capacitor 50V dc, Through Hole - SLPX223M050H9P3 | RS Components

FYI My SMPS is below link, customized for Single 42V.
at output it has only one 1800uf 50V

GHXAMP HIFI Switch Power Supply Dual DC 24V 48V 60V 80V 300 500W Power Supply Board With Heat Sink For Low power Amplifier 1pc|Amplifier| - AliExpress

Last edited by saran008; Yesterday at 03:53 AM.
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