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Class D Switching Power Amplifiers and Power D/A conversion

Philips UCD application note
Philips UCD application note
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Old 5th August 2007, 10:39 AM   #461
tawn10 is offline tawn10  United Kingdom
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Quote:
Originally posted by TOINO
Sorry…I can’t help everybody.
Now you know the equipment references. That is the difficult part.

Last night I have found another one with UCD, but have not the schematic.
They call the amplifier module CUD-S400 . It is what is marked on pcb.

The output transistors are 2SK3607-01MR
Turn off transistors 2SA1954
Drv BC857CW
Gate diodes BAS316.
Cascodes between comparator and driver 2SC2713
Input BC856BW

Suply regulated SMPS +44V -44V

YAMAHA portable Pa system “STAGEPAS 500”
I find it interesting that a system consumes 65w of power and outputs 500w of power?? how does that work!
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Old 5th August 2007, 01:25 PM   #462
oldmaelstrom2 is offline oldmaelstrom2  Ukraine
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Philips FWM730 service manual. Size 34mB
http://rapidshare.com/files/47100154...ice_manual.rar
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Old 5th August 2007, 02:13 PM   #463
TOINO is offline TOINO  Portugal
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Quote:
Originally posted by tawn10


I find it interesting that a system consumes 65w of power and outputs 500w of power?? how does that work!

Strange times my friend…
The market has so many of these miracles as the hell of good wills.
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Old 5th August 2007, 02:55 PM   #464
Eva is offline Eva  Spain
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I think that the built-in amplifier is actually 2x200Wrms@4 ohms and 2x120Wrms@8 ohms, assuming that the SMPS can handle those power levels continuously (but it probably can't as continuous operation at full power is not required at all with music).

On the other hand, they don't specify the nominal impedance of the loudspeakers, but it may easily be 8 ohms so that an optional second pair can be added... Could you enlighten us about that, Toino?

Anyway, it must be noted that a 2x200W SMPS class D system can easily play music at clipping threshold while drawing only 65W or less. In comparison, a traditional class AB system with stone age power supply would be probably drawing 265W and wasting 200W as heat...
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Old 7th August 2007, 05:24 PM   #465
eltonseemann is offline eltonseemann  Brazil
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Hi!

your Philips FWM730 service manual show this protection circuit:
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File Type: png ucd_disable.png (36.1 KB, 1640 views)
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Old 7th August 2007, 05:30 PM   #466
eltonseemann is offline eltonseemann  Brazil
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Question ... UcD output stage and current sense

protection circuit is for 2 UcDs. My question is if the last circuit act as a latch in case of overcurrent detection

UcD output stage with current detectors:
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File Type: png ucd_out.png (16.0 KB, 1581 views)
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Old 7th August 2007, 08:00 PM   #467
eltonseemann is offline eltonseemann  Brazil
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or is it a relaxation oscilator? (upper part around 7210-C 74HC14D)
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Old 15th February 2010, 08:30 PM   #468
selfservice is offline selfservice  Italy
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Quote:
Originally Posted by Steven View Post
Philips released its UCD application note.
The UcD concept was patented by Philips. However, the use of the IP is granted (without a license fee) to third parties that use the enabling semiconductor components from Philips Semiconductors in their application.
Where did you get that info? I've googled a lot but nothing came up...
Are you sure the rights are philips property and not hypex property since they hired the inventor?
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Old 16th February 2010, 10:20 AM   #469
AP2 is offline AP2  Italy
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Quote:
Originally Posted by lumanauw View Post
In this DIY UCD, in the input differential, there are capacitors C42-C44 valued 22pf connected to ground.

What is the function of these capacitors?
-------------------------------------------------------
the function of these two capacitors is to suppress the Glish due to the junction of the diode (behavior with high frequency signals).
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Old 16th February 2010, 11:04 AM   #470
AP2 is offline AP2  Italy
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Hi,
C40-C45 (22pF) also have the same function.
This interpretation has been looking at the schematic on this thread.
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