My problem regards to UC3834(a linear regulator) i picked it up to design a power supply having an output of 5v @ 4A full load current and that too with a maximum head room of 1V .For this i tried one of its application circuit published in its appnote by TI titled as"U-95,versatile UC1834 optimises Linear Regulator Efficency" The circuit is present as fig17 in the said appnote and describes a +5V output@5A with a minimum in-out differential of 0.5V. To my surprise it did'nt work beyond 1.2A current,albeit i applied it as it is drawn .No need to mention that i blew up some of outputpass PNP Transistors.Could any one suggest any modification in the said circuit or some type of another ,based around UC3834. I would be much greatful
Tariq Bin Sharif
Pakistan
Tariq Bin Sharif
Pakistan
howdy,
what transistor did you use for the pnp pass?
did you substitute any other parts?
how did the emitter to ground voltage track through the loading process?
what transistor did you use for the pnp pass?
did you substitute any other parts?
how did the emitter to ground voltage track through the loading process?
Sorry for contacting you a bit late!
1) i used a TIP147
2) no besides the said Transistor i did'nt replace any component
3) Enquiring about "Ve" i think you mean that whether my input source is well enough to handle the output current requirement .The answer is that the voltage across the emitter w.r.t ground remains unchanged
4) if you can assit me with a working design,based around UC3834(of course which u have used suceesfully) be that of any output voltage ,i will analyse and apply it on my bench and hope i will get a solution of my problem
Thank you
1) i used a TIP147
2) no besides the said Transistor i did'nt replace any component
3) Enquiring about "Ve" i think you mean that whether my input source is well enough to handle the output current requirement .The answer is that the voltage across the emitter w.r.t ground remains unchanged
4) if you can assit me with a working design,based around UC3834(of course which u have used suceesfully) be that of any output voltage ,i will analyse and apply it on my bench and hope i will get a solution of my problem
Thank you
You can't replace a single transistor by a darlington in such a circuit without considering frequency compensation.
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