Hi, what do you think how is the 78L05 stable regarding temperature changes? What output voltage change do you expect if there is a temperature increase, resp. decrease of 10 Celsius grades?
Thanks
Fero
- posted
19 years ago
78L05 temperature stability
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- posted
19 years ago
And there are more accurate / stable parts in the same package, such as the LP2950ACZ-5.0 types, 20ppm/C typ = 0.1mV/oC
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Thanks,
- Win
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- posted
19 years ago
Hah, the LP2950 *is* a bandgap reference (with a step-up amplifier)
That would be a puzzle, something I haven't noticed. The LM78L05 says its load regulation is typically 0.1% (1 to 40mA), whereas the LP2950 says its regulation is typically 0.04% (0.1 to 100mA). Of course, if you did mean 7805, rather than 78L05... The LP2950 has a nice low ground current of only 75uA (at low load currents).
With its 0.5% spec, and its low cost ($0.36 qty 1k at DigiKey), the LP2950A nicely straddles the line between voltage regulator and voltage reference... You can power a few modest-drain items and also use it as a tolerable voltage reference.
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Thanks,
- Win
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- posted
19 years ago
It is all in the datasheets. For the LM78XX, there is an "Average Output Voltage TempCo" of typical -0.65mV/°C
HTH Wolfgang
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- posted
19 years ago
So is the 12-cent LM78L05, no?
It's a lot fussier about output capacitance than the 78xxx regulators (can be unstable with ceramic capacitors or too little capacitance). Maybe his was oscillating. At the price, I do like the tolerance of the A version for some applications.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
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- posted
19 years ago
sorry,
should be LM78_L_XX
HTH Wolfgang
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- posted
19 years ago
Hi Winfield,
W>>
Well, yes, of course, but the OP asked specifically for 78L05. If he needs an accurate voltage, the OP would be better off using a bandgap reference or something.
I have once used an LP2950-5.0 instead of a 7805. I was puzzled, how poor the load regulation was compared to a 7805.
regards, Wolfgang
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- posted
19 years ago
Try reading the datasheet !
Graham