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Ideal bridge rectifier GB
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Old 12th February 2019, 07:44 AM   #11
analog_sa is online now analog_sa  Europe
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Ideal bridge rectifier GB
There was a very positive buzz on this forum about the combination of LT4320 and the GS61008T.

The idea of sync rectification for audio sounds great in theory but i have no idea what is sounds like in an actual amp. Sometimes great ideas translate into great sound, but sadly not often.
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Old 12th February 2019, 07:44 AM   #12
jan.didden is online now jan.didden  Europe
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Maybe you should explain a bit about synchronous rectifiers, not everyone will be up to speed, and realize the benefits of rectifier diodes with zero threshold.

Jan
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Old 12th February 2019, 07:51 AM   #13
vega65 is online now vega65  Norway
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I would like to sign up for 6 pairs . Will use them in front of Rod Colemans filament regulators. Well done Tibi!
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Old 12th February 2019, 07:55 AM   #14
jan.didden is online now jan.didden  Europe
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Ohh yes, they would be ideal for filament regulators, you're always fighting for the last volt there from a 6.3V AC winding! Good idea.

Jan
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Old 12th February 2019, 08:04 AM   #15
tvicol is offline tvicol  Europe
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Ideal bridge rectifier GB Ideal bridge rectifier GB
Quote:
Originally Posted by analog_sa View Post
There was a very positive buzz on this forum about the combination of LT4320 and the GS61008T.

The idea of sync rectification for audio sounds great in theory but i have no idea what is sounds like in an actual amp. Sometimes great ideas translate into great sound, but sadly not often.

Thank you, analog_sa ! GS61008T is an impressive device.

Regards,
Tibi
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Old 12th February 2019, 08:09 AM   #16
secanbj is offline secanbj  Sweden
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Ideal bridge rectifier GB
very interested
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Old 12th February 2019, 08:21 AM   #17
Art M is offline Art M  United States
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Quote:
Originally Posted by jan.didden View Post
Maybe you should explain a bit about synchronous rectifiers, not everyone will be up to speed, and realize the benefits of rectifier diodes with zero threshold.

Jan
I am a Bit confused here as: - AC operating voltage 6,5Vac to 51Vac
- DC operating voltage 9Vdc to 72Vdc

In any case, how can these be " zero threshold " as FET drive required.
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Old 12th February 2019, 08:43 AM   #18
jan.didden is online now jan.didden  Europe
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You can always feed a bridge with DC. Normally it doesn't make much sense but is does work fine.

Edit: 51VAC is RMS which is 1.4 X DC, ~ 72V...

The synchronous rectifier generates an internal source that is used to switch on the MOSFET as soon as the Vds starts to go up after zero crossing of the input voltage.

You could also click the link the OP has given ;-)

Jan
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Last edited by jan.didden; 12th February 2019 at 08:52 AM.
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Old 12th February 2019, 09:14 AM   #19
xrk971 is online now xrk971  United States
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Ideal bridge rectifier GB
Interesting timing as Janhofland, myself and AKSA have just designed an active bridge using this chip for making 5A continuous load ideal bridge rectifier for a large Class A amp in order to reduce the huge thermal losses from a traditional diode bridge at these kinds of current. I ran across the LT4320 chip about 3 weeks ago. Board still needs to be ordered and will test soon.
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Last edited by xrk971; 12th February 2019 at 09:18 AM.
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Old 12th February 2019, 09:20 AM   #20
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by jan.didden View Post
Maybe you should explain a bit about synchronous rectifiers, not everyone will be up to speed, and realize the benefits of rectifier diodes with zero threshold.

Jan
A good explanation is here:
LT4320 Ideal Diode Bridge Controller Cuts Power Dissipation, Improves Efficiency | Power Electronics

One thing I am unsure of, is how the transients of the resulting sawtooth wave looks after the bulk cap? Does it even look like a diode sawtooth? Or will it be a total mess? Although, it can't get much worse than a sharp sawtooth in terms of audio harmonic generation.
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Last edited by xrk971; 12th February 2019 at 09:22 AM.
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