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Why not use the high current schematic the datasheet provides? And Yes I have seen this happen when this exact same thing was tried, in lab, when I was a student, and another student tried this exact same setup, feeding the regulator circuit from a 12 volt 1 amp regulated power ddatasheet.
Short story is that you can’t reliably or cleanly get twice the current from two paralleled voltage regulators that ostensibly produce the same output. I think my first paragraph says so, in so many words.
Please enter your comment! Yes you can, however, you need to isolate them from each other which will lower the output by about. Switcher output can also be filtered for those low power but noise sensitive parts of the circuit. Linear regulators may in fact be paralleled, but not catasheet.
The input voltage was monitored on an Oscope and never changed more than datadheet handful of millivolt downward, but the output of his circuit was a flat topped high frequency pulse in the Hz range.
Log into your account. Thank you for clear explanation! Might or might not be catastrophic for the load. If you are going to be using a heatsink, better calculate the heatsink size properly. This pin is neutral lj7085 equally the input and output. It’s best to use a larger regulator with higher capability. This keeps Q1 off, and things work as before.
IgnacioVazquez-Abrams there are dozens of options from different manufacturers and the datasheets are all different. It’s true one of them will do most of the work, and would be more likely to fail than the other after months or yearsbut I assume your question relates to using up parts on hand rather than a production design.
Olin Lathrop k 30 If the regulator does not have a heat sink to dissipate this heat, it can get destroyed and malfunction. You can include diodes on each to protect them, but still they will not share the load evenly. Instead, the entire chip becomes the feedback loop.
That datqsheet it requires It is unwise to assume that because the current requirements are high, a switcher should be used. Monday, December 31, These circuits reduce the output current or shutdown the regulator, protecting it from damage in case of a fault. Both the latest TI and ST datasheets include the relevant circuit.
LM Datasheet, LM PDF – Free Datasheets
The bandgap reference yellow keeps the voltage stable. Can I use two ICs in parallel to get double current capacity? The xx in 78xx indicates the output voltage it provides. Spend the money that adtasheet would on heat sinks, increased assembly costs, and shipping on a better design, then you’re saving money every unit you make.
Please enter your name here. Let’s say the input voltage is only 8. The second half of this doesn’t make any sense at all. Home Questions Tags Users Unanswered.
All About IC 7805 | Voltage Regulator
Most additional current demand will be taken l,7085 by the transistor, not the regulator. Does this IC boost voltage input is voltage is less than 5? The greater the difference between the input and output voltage, more the heat generated. The voltage divider blue scales down the voltage on the output pin for use by the bandgap reference. OP says nothing about the nature of the load, so that’s his problem. Worse yet, some datasheets show that approach too. Circuit datxsheet from here and there appear to be several variants of this on the web such as this: If you need that kind of current, linear regulators are usually not the answer, as they will dissipate quite a lot of heat.
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Hope it suits your requirements. If it were a good design it would use a switching regulator or perhaps an LDO linear if extreme precision is required for a specific part of the circuit. It might shut down, it might gracefully reduce its output voltage. In this pin where the ground is given.
Perhaps an editor would clear this up. Career advice and jobs related to electronics and IOT. And what exactly happens if one regulator is inevitably a little higher in voltage ,m7085 the other?