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Old 18th June 2010, 09:05 AM   #21
sangram is offline sangram  India
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Thanks for clearing that up. I should be placing my order next week, and we can talk about how to finally solve our old business too
 
Old 18th June 2010, 09:58 AM   #22
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Quote:
Originally Posted by Cristi View Post
Alhtough most of the ppls tend to say that the MOS-FET sounds better, i still believe (and i look at the measurements too) that the SAP version is on the first place then followed by the MOS-FET and after the plain Bipolar version.
Thank you for the clarification! I am bipolar man myself, but you obviously know your designs best !

Best,
Bratislav
 
Old 20th June 2010, 05:49 AM   #23
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Cristi,

I've just looked at large image of 4702 SAP15 module - it looks like it doesn't need separate drive voltage (only + and - VCC) ? What voltage is needed for this board (for 100W/8ohm) ?
This would simplify things even further, as pretty much any SMPS would work with it ...

Thanks,
Bratislav
 
Old 20th June 2010, 06:56 AM   #24
Cristi is offline Cristi  Europe
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The available version of SAP15 LME4702 amplifier requires just single symetrical supply. the version 2 (prototype under test) have separate rails for driver and power stage.
To get 100W at 8R the amplifier must be supplied with +-53 to +-57V DC.
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Old 20th June 2010, 08:20 AM   #25
sangram is offline sangram  India
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Right - please hold one of the current version for me. Will this go well with your SMPS of 350 watts?
 
Old 20th June 2010, 08:42 AM   #26
AndrewT is offline AndrewT  Scotland
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I find that a 35+35Vac transformer giving +-50.5Vdc from the PSU allows about 110W into 8r0 and 200W into 4r0.
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regards Andrew T.
 
Old 23rd June 2010, 12:53 PM   #27
Cristi is offline Cristi  Europe
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The actual version of the SAP15 LM4702 amplifiers can work well with SMPS350. Note that this smps doesn't have the aux. voltage which is required for the other versions of the LM4702 amplifiers.

Andrew,
acctually to get 100W at 8R there is enough 1.25*(1.41*sqrt(100W*8R)) for each rail, which is 50V as you mention. but because the maximum performance from this amplifier is the main goal and not the efficiency, i prefer to increase the voltage with few volts, and i also consider that the smps being unregulated the voltage may drop in case of high load current demand.
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Old 23rd June 2010, 01:05 PM   #28
sangram is offline sangram  India
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Cristi I sent an email to your gmail account, did you get it?
 
Old 23rd June 2010, 02:04 PM   #29
Cristi is offline Cristi  Europe
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I've saw the mails, i will reply a bit later, i just came back.
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Old 12th July 2010, 12:24 PM   #30
alkasar is offline alkasar  France
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Hello Cristi,
I consider LM4702, hesitate MOS-FET or SAP15.

1.I see you work on a new SAP15 with dual voltage. I will use linear power supply. Given the additional cost involved for dual power and larger space required, what is according to you the benefit of sap15 dual voltage ?

2. what is the size of the heatsink you provide with mosfet version ? it seems bigger than the pcb on the pictures

3. I guess pcb size of sap15 and mosfet versions are the same. can you provide the heatsink with the sap15 module ?

thanks,
 

 


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