Has anyone tried using the LM4651 from National Semiconductor and replacing the LM4652 with discrete components? I would think that using discrete MOSFETs should yield a higher power output than 170W (which is what the LM4652 is rated for).
the distortion and efficency is much to poor compared to other offerings, so i doubt you will find many has put seriouse effort into those chips here.
i know i wouldent bother with them anyways.
-Marius
i know i wouldent bother with them anyways.
-Marius
I know it is probably not the ideal choice, I was thinking of using it as the basis for a tracking power supply in a class H amplifier (so its distortion and less than perfect quality would not be a major factor).
Hey! I'm building a Class-H too......not much info to go on here except that one Class-H thread. Can anyone point me to a good reference design/schematic?
I've almost finished building the output stages consisting of 8x BPA200 reference design with a few tweaks. The power supply topology I've been looking at is a full wave buck stage (isolating) feeding 8 class-d's to track the voltage for the output stage.
I've come up with a few problems:
Where should I take the error correction from, the input or the output?
If I take it from the output, how do I account for phase shift in the output stage?
Just a note on using D class for voltage following; D's don't like reactive loads so keep capacatince on the output rails to a minimum.
I'd be interested to see what you've come up with so far. 🙂
I've almost finished building the output stages consisting of 8x BPA200 reference design with a few tweaks. The power supply topology I've been looking at is a full wave buck stage (isolating) feeding 8 class-d's to track the voltage for the output stage.
I've come up with a few problems:
Where should I take the error correction from, the input or the output?
If I take it from the output, how do I account for phase shift in the output stage?
Just a note on using D class for voltage following; D's don't like reactive loads so keep capacatince on the output rails to a minimum.
I'd be interested to see what you've come up with so far. 🙂
samborambo said:
Should read:
If I take it from the input, how do I account for phase shift in the output stage?
rtarbell said:
http://www2.national.com/appinfo/audio/files/FAQ_Lm4651_52.pdf
Read the first two FAQs.
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