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Old 28th June 2012, 04:54 PM   #1
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Default PSRR using contant current source in ZEN

Hi,

I have made a current sink (NPN , darlington power module) set at 10 A. at 50volt rail supply.

I want to use IRFP 450 as MOSFET/gain device as it is pretty liner. (5 devices in parallel) expected to have 50w of single ended ZEN BUT the topology is up side down, instead of source i am using a Sink as i had the NPN module, my question is would it provide similar PSRR as compared to source ???? or is it a bad idea ???
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Old 28th June 2012, 06:48 PM   #2
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Yes, if the transistor data is about the same (mainly HFE of transistors). But, I want to suggest to use another FET in the same amount as the amplifier itself, and modulate them in a manner similar to the WCF. It works pretty fine, and you halve the output impedance and then bettering the coil damping. This is my project. Ignore the driver stage if you want.
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Last edited by Osvaldo de Banfield; 28th June 2012 at 06:50 PM.
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