Mosfet reg vs Mosfet shunt reg

linuxfan

Member
2007-12-09 3:09 pm
Could someone offer an explanation of the differences, technical and real-world, between Mosfet regulators, such as these on eBay -
High Speed LOW Noise Mosfet Power Supply Regulator KIT | eBay
High Quality Mosfet DC Regulated Power Supply PCB | eBay

versus Mosfet shunt regulators, such as the Salas regs.

Technically, the eBay regs have no CCS front end, correct?
Is the CCS/shunt aspect the key to keeping noise as low as possible?
I'm particularly interested in a mains power supply solution for the SEN I/V converter, where power supply noise is critical.
Thanks
 

Mark Johnson

Member
Paid Member
2011-05-27 3:27 pm
Silicon Valley
Technically, the eBay regs have no CCS front end, correct?

Both of the eBay voltage regulators have Constant Current Sources driving the gate electrode of a series pass transistor. I don't know whether you consider that to be a "CCS front end", or not.

The second one uses current regulator diodes to implement constant current sources; (here is a device datasheet)
 

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