alexgross81
New Member
hi, I want to design an adjustable switched mode power supply beginning from zero volts. any hints?
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No, you'll have to design your own LDO that does that.Are there LDOs that track the input voltage? And which LDOs go down to 0V output (in regulation)?
You could bias the 0V node at -1.25V, here's an idea using the LM317 and I don't see why it couldn't be adapted to a switcher.Driver300 said:Most adjustable SMPS ICs have a feedback input that looks for 1.25 V and it is expected that there will be a potential divider connecting the output of the power supply to that input.
I spent about 20 years designing power supplies and that is just about typical for the specifications we would get........hi, I want to design an adjustable switched mode power supply beginning from zero volts. any hints?
That's pure genius!Get a 'Class D' Audio Amplifier and modify it to become a Variable Power Supply. As a bonus, it'll be capable of outputting negative voltage as well.
?relatively slowly
The slew rate of the current in the inductor is directly proportional to:What do you call ?
VRM's, which are buck converters, have VERY HIGH current slew rates.
Well any buck converter has to switch much faster than the current can change in the inductor. That was where the relatively comes from. To understand a buck converter on a basic level, it's good enough to assume that the switch opens or closes instantaneously, while the inductor current changes slower than anything else in the circuit.What do you call ?
VRM's, which are buck converters, have VERY HIGH current slew rates.