UCD with switching mode power supply

Can anyone comment on the UCD performance with SMPS and linear power supply?

Ack,

Try to ans your question.

1. Depends on the "Quality"  of the SMPS and Linear PS
2. For any of the Class D, FF, VF, SODA, they are taken the current from the power supply cycle by cycle. E.g. if the Class D OSC freq. is 380KHz, that mean the power supply should supply the V/I 380K times / sec. If the power supply is not fast enough to "recover", it will look like 氣喘 and 腳軟

3. For using SMPS, it have fast response (typically is 67-100KHz) oscillation. including the output capacitor, it will enough the amplifier to draw the current rapidly. Some people may be increase the value on the output capacitor, it is too dangerous to do this, some of the SMPS controller / circuit may be not able to drive "capacitive load" during startup even they have "soft start" or not.

4. For the Linear power supply, the output cap. is as large as value as possible, but if you want to get the better sound (more transpency), give a hint to you, you need to 打散 the capacitor value.  i.e. the charging and discharging time of 100pcs 100uF is much much faster than ONE piece of 10000uF. The output impedance is much much lower than using a single one.

We will have a detail and FAIR comparision of this TWO topology soon.

請留意我們的公佈 !

KK.HO

Thanks! Very exciting! saw some good comments on diyaudio.com about the coldamp SMPS with Ucd. Would be intereting to know the performance! I believe Jab-Peters and Bruno is developing a SMPS for their Ucd. Would be nice if you guys, as a dealer can test drive their SMPS in teh near future!

Dear Ack,

We will prpeare diff. kinds of comparision for UCD 50/180/400/700 SMPS and Linear PS soon.

Thanks for your interesting and support.

KK.Ho

小弟聽過UCD400AD配ColdAMP SPS80和UCD400AD配傳統Linear Power Supply(巳改用發燒電解)，兩者各具特色！
配SPS80的，動態大，速度高，低頻比較收得快，分析力高
配Linear Power Supply的，音樂感稍比SPS80豐富，甜美，溫純，分析力稍比SPS低少許！

個人認為UCD400AD是一個極優質的Class-D Power Module，要配撘甚麼Power Supply，只是個人口味而巳。但Linear Power Supply對濾波電解電容的要求十分嚴格，是直接影響整體效果！