Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options answers only not deleted user 20218

A heatsink dissipates heat into the surrounding air and thus provides cooling.

2 votes

MOSFET Heatsink?

This will happen irrespective of whether you have a heatsink or not. In other words, having a heat sink won't prevent this from happening. …
Andy aka's user avatar
  • 473k
0 votes

Generic thermal resistance values for a heatsink

But, it's worse than this because you can't have an infinite heatsink taking all that heat energy away. … Small gains maybe but they could be useful to have if you can afford the extra heatsink complexity. …
Andy aka's user avatar
  • 473k
1 vote
Accepted

LM2596 Heat Sink

The graph delivers you the power dissipated by the device in producing a 5 volt, 3 amp output from a 12 volt supply using a Thermalloy heatsink #7020: - Junction-to-case (top) thermal resistance = 2 ° … C/W And you have to add this to the thermal resistance of the quoted heatsink in the graph (Thermalloy #7020) and that heatsink is going to be very close to this: - Here's a link to Farnell that appears …
Andy aka's user avatar
  • 473k
1 vote

Heat sink thermal resistance

So, you need to know things about the heatsink that cannot be necessarily determined by vision alone. … Heatsink and component orientation will matter. …
Andy aka's user avatar
  • 473k
25 votes
Accepted

Why are these SMD heatsinks designed to not touch the IC?

Your heatsink then solders to that same copper pad on the PCB. … This picture (from the question) isn't the intention of the heatsink manufacturer: - Recap The IC's TO-263 footprint (as specified in the heatsink data sheet) has a thermal pad like so: - That thermal …
Andy aka's user avatar
  • 473k
0 votes

Installing heatsink on a bridge rectifier: which side of the rectifier should it be installe...

The first option is use big solder copper pads and the 2nd option is to mount a heatsink and, as Charles as pointed out that will be on the non-written side of the device. … And this is on page 1 of the data sheet: - This information allows you to calculate how big a heatsink you need for such and such a power dissipation. …
Andy aka's user avatar
  • 473k
0 votes

does a larger or smaller C/W thermal resistance value indicate greater heat dissipation

Does a larger thermal resistance value indicate it will dissipate more or less heat? The source of the heat is the transistor (e.g.) that is attached to the heat-sink. That heat originates from the …
Andy aka's user avatar
  • 473k
7 votes
Accepted

Can two IRLZ44N MOSFETs in parallel handle a current of 20 A without heat sink?

Consider the scenario without a heatsink first: - The junction-to-ambient thermal resistance for the IRLZ44N is 62°C/watt The on-resistance of the IRLZ44N is 0.022 Ω with a 10 volt gate-source drive voltage …
Andy aka's user avatar
  • 473k
3 votes
Accepted

Are vias underneath a SMD component without a thermal pad useful for cooling?

Take note of what the data sheet says about thermal resistance: - The main point is that heat is transferred via the terminals about 2.5 times better than it is transferred via the body. Either way, …
Andy aka's user avatar
  • 473k
4 votes

How should I design a heat sink for an SMD power MOSFET?

You can buy heatsinks that can solder to the PCB copper but, for this device, if you look at the thermal characteristics in the data sheet on page 4, you will see that directly attaching a heatsink to … There are plenty of options to consider and plenty of offerings from the usual heatsink suppliers. …
Andy aka's user avatar
  • 473k
3 votes
Accepted

Is it okay to leave regulators heating at higher end of range of operating range?

You need to calculate the junction temperature when dissipating 10.5 watts at an ambient of 70 °C. The 10.5 watts comes from the fact that the linear regulator is dropping 7 volts to convert 12 volts …
Andy aka's user avatar
  • 473k
4 votes

Heat sink for the L298 stepper driver IC

The total volt drop when saturated can be as high as 4.9 volts when taking 2 amps. This is an internal power dissipation of 9.8 watts and is the reason why nobody with any experience of these devices …
Andy aka's user avatar
  • 473k
1 vote

What temperature should I expect by lighting 3W-LEDs?

The “junction to ambient” thermal resistance is equivalent to a resistance parallel to the “junction to solder” thermal resistance and, that parallel resistance is usually much greater than the “junct …
Andy aka's user avatar
  • 473k
14 votes

Heat Dissipation Calculation for MOSFET

Will a heatsink help? No, the catastrophic event described above will be over in less than 10 ms and sometimes this may be as rapid as 100 us. …
Andy aka's user avatar
  • 473k
1 vote

Intermittent power dissipation calculation on TO-220 package

Wikipedia says: - When a TO-220 package is used without a heatsink, the package acts as its own heatsink, and the heatsink-to-ambient thermal resistance in air for a TO-220 package is approximately … This means that without an external heatsink, the T0-220 heatsink will rise 70 °C for each watt dissipated. Can I get away with a large enough copper plane? …
Andy aka's user avatar
  • 473k

15 30 50 per page