Things to avoid when using voltage regulators?Power Supply Design - Multiple Voltage RegulatorsConnecting several power regulators to a single voltage inputUsing Linear Voltage Regulators in Series?Different power sources for pcbEnsuring common ground in a circuit with several voltage requirementsWhy do linear voltage regulators have minimum output voltage > 0 VPower circuit with several voltage regulators — design rulesthe proper way to wire up multiple supply railscan I use Two Same Power supply sharing input in single circuit?Power source project
Should QA ask requirements to developers?
Why would one plane in this picture not have gear down yet?
How do I express some one as a black person?
Who deserves to be first and second author? PhD student who collected data, research associate who wrote the paper or supervisor?
How strictly should I take "Candidates must be local"?
Could a cubesat propel itself to Mars?
Could a cubesat be propelled to the moon?
PTIJ: How can I halachically kill a vampire?
The bar has been raised
Does splitting a potentially monolithic application into several smaller ones help prevent bugs?
How are such low op-amp input currents possible?
Examples of a statistic that is not independent of sample's distribution?
Can you reject a postdoc offer after the PI has paid a large sum for flights/accommodation for your visit?
How does airport security verify that you can carry a battery bank over 100 Wh?
Aliens englobed the Solar System: will we notice?
2×2×2 rubik's cube corner is twisted!
If the Captain's screens are out, does he switch seats with the co-pilot?
Good allowance savings plan?
Why does the negative sign arise in this thermodynamic relation?
A question on the ultrafilter number
A three room house but a three headED dog
show this identity with trigometric
How do I deal with a powergamer in a game full of beginners in a school club?
How to pass a string to a command that expects a file?
Things to avoid when using voltage regulators?
Power Supply Design - Multiple Voltage RegulatorsConnecting several power regulators to a single voltage inputUsing Linear Voltage Regulators in Series?Different power sources for pcbEnsuring common ground in a circuit with several voltage requirementsWhy do linear voltage regulators have minimum output voltage > 0 VPower circuit with several voltage regulators — design rulesthe proper way to wire up multiple supply railscan I use Two Same Power supply sharing input in single circuit?Power source project
$begingroup$
My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.
power-supply voltage-regulator
asked 11 hours ago
DanielPatrickDanielPatrick
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
|
show 2 more comments
$begingroup$
My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.
power-supply voltage-regulator
asked 11 hours ago
DanielPatrickDanielPatrick
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
2
$begingroup$
Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
$endgroup$
– Chris Stratton
11 hours ago
$begingroup$
Another issue would be if all circuits share a common ground or not.
$endgroup$
– DrMoishe Pippik
11 hours ago
$begingroup$
The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
$endgroup$
– Sunnyskyguy EE75
10 hours ago
$begingroup$
what wrong with having them in series to help spread the heat?
$endgroup$
– dandavis
10 hours ago
1
$begingroup$
@dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
$endgroup$
– Ale..chenski
9 hours ago
|
show 2 more comments
$begingroup$
My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.
power-supply voltage-regulator
asked 11 hours ago
DanielPatrickDanielPatrick
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.
power-supply voltage-regulator
power-supply voltage-regulator
asked 11 hours ago
DanielPatrickDanielPatrick
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
DanielPatrickDanielPatrick
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
DanielPatrickDanielPatrick
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
DanielPatrickDanielPatrick
161
asked 11 hours ago
DanielPatrickDanielPatrick
161
161
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
$begingroup$
Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
$endgroup$
– Chris Stratton
11 hours ago
$begingroup$
Another issue would be if all circuits share a common ground or not.
$endgroup$
– DrMoishe Pippik
11 hours ago
$begingroup$
The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
$endgroup$
– Sunnyskyguy EE75
10 hours ago
$begingroup$
what wrong with having them in series to help spread the heat?
$endgroup$
– dandavis
10 hours ago
1
$begingroup$
@dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
$endgroup$
– Ale..chenski
9 hours ago
|
show 2 more comments
2
$begingroup$
Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
$endgroup$
– Chris Stratton
11 hours ago
$begingroup$
Another issue would be if all circuits share a common ground or not.
$endgroup$
– DrMoishe Pippik
11 hours ago
$begingroup$
The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
$endgroup$
– Sunnyskyguy EE75
10 hours ago
$begingroup$
what wrong with having them in series to help spread the heat?
$endgroup$
– dandavis
10 hours ago
1
$begingroup$
@dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
$endgroup$
– Ale..chenski
9 hours ago
2
2
$begingroup$
Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
$endgroup$
– Chris Stratton
11 hours ago
$begingroup$
Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
$endgroup$
– Chris Stratton
11 hours ago
$begingroup$
Another issue would be if all circuits share a common ground or not.
$endgroup$
– DrMoishe Pippik
11 hours ago
$begingroup$
Another issue would be if all circuits share a common ground or not.
$endgroup$
– DrMoishe Pippik
11 hours ago
$begingroup$
The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
$endgroup$
– Sunnyskyguy EE75
10 hours ago
$begingroup$
The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
$endgroup$
– Sunnyskyguy EE75
10 hours ago
$begingroup$
what wrong with having them in series to help spread the heat?
$endgroup$
– dandavis
10 hours ago
$begingroup$
what wrong with having them in series to help spread the heat?
$endgroup$
– dandavis
10 hours ago
1
1
$begingroup$
@dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
$endgroup$
– Ale..chenski
9 hours ago
$begingroup$
@dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
$endgroup$
– Ale..chenski
9 hours ago
|
show 2 more comments
2 Answers
2
active
oldest
votes
$begingroup$
The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:
Or Texas Instruments TPS65400:
Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:
This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.
Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.
Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
$endgroup$
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
add a comment |
$begingroup$
To address the spirit of your question, yes it is acceptable to use a 12V "Bus" as an upstream supply for "LDO" regulators. This is necessarily done in vehicle/cessel design, albeit with healthy use of opto-isolation and filtering of unconditioned inputs to circuits.
It is also common to see this on Micro Controller programming boards, where 12V, 5V, 3.3V are all required and supplied from an upstream 15V. (High voltage Programmers for Microchip/Atmel devices.)
I would not "chain" them either. Modern buck converters, if used as an assembly, will not necessarily put a lot of HF back on that supply, but a cage might be an idea.
answered 3 hours ago
mckenzmmckenzm
1373
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
);
);
, "mathjax-editing");
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "135"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
DanielPatrick is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f426945%2fthings-to-avoid-when-using-voltage-regulators%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:
Or Texas Instruments TPS65400:
Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:
This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.
Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.
Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
$endgroup$
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
add a comment |
$begingroup$
The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:
Or Texas Instruments TPS65400:
Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:
This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.
Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.
Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
$endgroup$
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
add a comment |
$begingroup$
The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:
Or Texas Instruments TPS65400:
Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:
This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.
Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.
Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
$endgroup$
The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:
Or Texas Instruments TPS65400:
Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:
This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.
Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.
Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
edited 7 hours ago
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
answered 10 hours ago
Ale..chenskiAle..chenski
28.2k11866
28.2k11866
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
add a comment |
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
$begingroup$
Great answer. Thanks!
$endgroup$
– Leroy105
8 hours ago
add a comment |
$begingroup$
To address the spirit of your question, yes it is acceptable to use a 12V "Bus" as an upstream supply for "LDO" regulators. This is necessarily done in vehicle/cessel design, albeit with healthy use of opto-isolation and filtering of unconditioned inputs to circuits.
It is also common to see this on Micro Controller programming boards, where 12V, 5V, 3.3V are all required and supplied from an upstream 15V. (High voltage Programmers for Microchip/Atmel devices.)
I would not "chain" them either. Modern buck converters, if used as an assembly, will not necessarily put a lot of HF back on that supply, but a cage might be an idea.
answered 3 hours ago
mckenzmmckenzm
1373
$endgroup$
add a comment |
$begingroup$
To address the spirit of your question, yes it is acceptable to use a 12V "Bus" as an upstream supply for "LDO" regulators. This is necessarily done in vehicle/cessel design, albeit with healthy use of opto-isolation and filtering of unconditioned inputs to circuits.
It is also common to see this on Micro Controller programming boards, where 12V, 5V, 3.3V are all required and supplied from an upstream 15V. (High voltage Programmers for Microchip/Atmel devices.)
I would not "chain" them either. Modern buck converters, if used as an assembly, will not necessarily put a lot of HF back on that supply, but a cage might be an idea.
answered 3 hours ago
mckenzmmckenzm
1373
$endgroup$
add a comment |
$begingroup$
To address the spirit of your question, yes it is acceptable to use a 12V "Bus" as an upstream supply for "LDO" regulators. This is necessarily done in vehicle/cessel design, albeit with healthy use of opto-isolation and filtering of unconditioned inputs to circuits.
It is also common to see this on Micro Controller programming boards, where 12V, 5V, 3.3V are all required and supplied from an upstream 15V. (High voltage Programmers for Microchip/Atmel devices.)
I would not "chain" them either. Modern buck converters, if used as an assembly, will not necessarily put a lot of HF back on that supply, but a cage might be an idea.
answered 3 hours ago
mckenzmmckenzm
1373
$endgroup$
To address the spirit of your question, yes it is acceptable to use a 12V "Bus" as an upstream supply for "LDO" regulators. This is necessarily done in vehicle/cessel design, albeit with healthy use of opto-isolation and filtering of unconditioned inputs to circuits.
It is also common to see this on Micro Controller programming boards, where 12V, 5V, 3.3V are all required and supplied from an upstream 15V. (High voltage Programmers for Microchip/Atmel devices.)
I would not "chain" them either. Modern buck converters, if used as an assembly, will not necessarily put a lot of HF back on that supply, but a cage might be an idea.
answered 3 hours ago
mckenzmmckenzm
1373
answered 3 hours ago
mckenzmmckenzm
1373
answered 3 hours ago
mckenzmmckenzm
1373
answered 3 hours ago
mckenzmmckenzm
1373
1373
add a comment |
add a comment |
DanielPatrick is a new contributor. Be nice, and check out our Code of Conduct.
DanielPatrick is a new contributor. Be nice, and check out our Code of Conduct.
DanielPatrick is a new contributor. Be nice, and check out our Code of Conduct.
DanielPatrick is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Electrical Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f426945%2fthings-to-avoid-when-using-voltage-regulators%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
$begingroup$
Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
$endgroup$
– Chris Stratton
11 hours ago
$begingroup$
Another issue would be if all circuits share a common ground or not.
$endgroup$
– DrMoishe Pippik
11 hours ago
$begingroup$
The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
$endgroup$
– Sunnyskyguy EE75
10 hours ago
$begingroup$
what wrong with having them in series to help spread the heat?
$endgroup$
– dandavis
10 hours ago
1
$begingroup$
@dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
$endgroup$
– Ale..chenski
9 hours ago