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

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MOSFET Heatsink Question

This is a follow up to my question from yesterday MOSFET Heat dissipation question Now that I know I need to use heatsinks on my MOSFETs, I've been looking around trying to find some. I found these ...
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59 views

Cutting extruded heatsink

I have this heatsink. It is extruded and is quite long (10cm) with 4.9°K/W. I had a similar heatsink but cutted to be square rather than rectangular, therefore with a side of 1.5cm and a thermal ...
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1answer
67 views

Help understanding why heat sinks work

Okay, so I'm trying to figure out why use heat sinks at all. Let's say if have a component that, by itself, is trying to dissipate (PD) 11W of power. The current TJ is at 50°C and the RJ-A of the ...
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4answers
341 views

When to use a heatsink for a voltage regulator?

Sometimes in small projects Im using voltage regulators with outputs 8V or 5V such as LM7805. Power is I*V but Im wondering when really a heatsink is needed. Sometimes the current flow from the ...
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53 views

Heatsink temperature probe

I read around that with an anonymous heatsink, you can measure its temperature when at regimen dissipating P watts. Then, (T-Tamb)/P gives its thermal resistance. Is that meaningful? Can I do this ...
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1answer
63 views

High dielectric strength temperature sensor (2500V)

I am trying to measure the temperature on a heatsink that is at Earth ground potential, while my circuit ground is at line potential. Typically I would use something like the Microchip MCP9700 in a ...
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2answers
114 views

MOSFET Circuit Design and Thermal Considerations

I'm a newbie at EE, and just I wanted to verify that the design I came up with for a MOSFET circuit that drives a 12V 500mA water pump will work. I'd also like to confirm I can run the N-Channel ...
2
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2answers
85 views

Heat Sink Isolation

What is the best strategy for heat sinking a MOSFET? I have a heat sink all picked out here. I also have a MOSFET picked out here. I know that the tab is electrified with the drain. There are a few ...
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1answer
38 views

Is it optimized to design same temperature for several heat sink in a power supply?

I plan to use 5 heatsinks in a two-switch forward converter. Should I to design same temperature for them or it is optimized to each heat-sink has a special temperature?
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1answer
117 views

Over designed heat sink or a well designed one?

I designed a heat sink for the first time. I am not sure if it is over designed or a well designed one? I use IRFP460 in a two-switch forward converter. The maximum power of the converter is 1000 ...
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2answers
208 views

PCB Heater design issues

I'm using copper tracks laid out on an FR4 board as a heater device. It's a serpentine design with the copper 0.3mm wide and 0.2mm spacing. I have three sets of tracks which I intend to heat up at ...
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1answer
116 views

why inductor is getting warm & burn in voltage regulator-lm2576

I am creating an add-on board for my raspberry pi. I want to power up the raspberry pi from a voltage regulator (LM-2576 o/p is 5v and 3-A). I also want to drive two dc motors, 3-servo motors, an ...
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3answers
50 views

heat sink calculation for parallel bjt

I'm working on a project and I need to use 3 parallel bjt to give me 20 A current.Total power dissipation is 356 W.I know how to calculate a sink for one transistor,but in this case I'm not sure what ...
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43 views

What does “Ducted Flow” mean at heatsinks? (catalog is linked)

I don't know which thermal parameter should I use. The heatsink will be placed on a H-bridge in a model car, but the car is covered, so I can't use the advantage of the air velocity. The catalog: ...
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3answers
172 views

Why do these two dramatically different sized heatsinks have similar thermal resistance?

I have a plate fin heatsink that measures 100mm wide x 114mm long x 4mm for the plate with 6 fins that are 35mm tall x 1mm thick. I get 1.84C/W at 100LFM when I punch these values into a heatsink ...
2
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1answer
149 views

PCB copper thickness heatsinking

Does increasing PCB copper thickness have any benefit for improving its heatsinking ability? I am looking at mounting some SMD Op Amps (OPA552) which will need to dissipate up to 2W each. I will ...
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1answer
52 views

Heatsink surface temperature

This question is related to who knows how to design a thermal management. I started learn to do this, at hobbyst level. So, this is the assumption of the situation: When someone design the thermal ...
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2answers
94 views

Could I use a heatsink to interconnect transistors mounting base?

I'm designing a CMOS H-bridge single sided board. To keep it small as possible, I would like to not connect the transistor's drain by trace. In spite off, as they are connected to the mounting base ...
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2answers
101 views

How can I make nichrome wire perform more consistent heating in liquids?

Was told to ask this here from chat. I have 32AWG nichrome water that I want to use to heat liquids. I submerged it into water and noticed that the part outside of water is glowing red, but the part ...
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1answer
57 views

When a Heatsink Require on MOSFET

How can we know weather a Component ( for example MOSFET) need A Heat sink to Work properly.
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158 views

COB LED on Aluminum tubes as heat sink

Thanks in advance for any contribution to my project, I'm afraid I'm pretty illiterate in terms of physics, heat dissipation, etc. I want to build a light with COB leds mounted on aluminum tubes, I ...
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2answers
203 views

TEC 12706 not drawing more than 1.6A when powered by a 12V PC SMPS

I have recently bought TEC 12706 device from Sunrom.com; The specification says that the device can draw more than 6A current at 15.4V and internal resistance is ~2 ohms. But when I measured the ...
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1answer
53 views

Design of a heat sink, combined with a pc cooling system

I currently have the task to cool a system of four small devices \$ \left(1 \times 5\; \mathrm{cm}^2 \; \text{each} \right)\$ with a total heat dissipation of \$150\$ W. My idea was to use a ...
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1answer
50 views

Where can I find the C/W rating for PI48, PI49 and PI51 heat sinks?

I was wondering if there is any reference to calculate the C/W ratings for PI48, PI49 and PI51 heat sinks? Just for reference, I am referring to these devices: ...
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2answers
87 views

Safety/efficiency of a makeshift aluminium can heatsink?

I had recently received a 9v 1A DC wall-wart off eBay, and needed to open it to swap the polarity of the jack to center negative. As I had the case open, my finger bumped against the metal part of the ...
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2answers
580 views

Thermal power dissipation for a diode with heatsink

I have a circuit that has a diode that needs to support 3A through it. The supply is at 7.2V and is therefore ~22W. I have currently selected a schottky diode show here. Key specs are it can ...
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3answers
238 views

How can I attach a heat-sink to legacy IC's?

I work (play) with some legacy chips like the mighty TMS9918. Which, if you didn't know, doesn't require a heat-sink but the thing does get really hot. Amazing ...
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3answers
129 views

How use DMM thermocouple probe hands-free to monitor heatsink temperature?

I suppose this is more of a lab practice question than electronics per se, but I wonder if there's a standard-ish way to mount the K-type thermocouple that comes with my Fluke DMM so I can monitor the ...
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1answer
97 views

Area of Copper Needed to dissipate 24 W

I need to know the area of 2oz copper needed to dissipate 24 W. The max temp is 100 C and the ambient temp is 40 C. Any equations I can use?
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3answers
82 views

Which way are heat sinks supposed to be mounted?

Which way are heat sinks supposed to be mounted? With the fins around the component, or facing outside?
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197 views

How to calculate heat dissipation improvement when adding a fan to the heat sink?

I'm using an LM338 which I want to supply at least 3A @ 20V, with Vin being 35V. I made my calculations and I figured out I'd need a very expensive (for my budget) heat sink so I'm looking for a more ...
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2answers
241 views

Mosfets cooled with Heatsink and fan?

For my circuit, I have mounted heatsinks to my mosfets to dissipate heat. I have below a crude drawing of how the heatsink/mosfet is placed on the PCB I was thinking to integrate a LM35 to measure ...
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1answer
234 views

How to design a heat bed / radiator using resistors?

I have to add some resistors to an aluminium plate on a 3D printer, because it only goes to 67'C without foam insulation. The heated bed currently reads 1.6 ohms (90W at 12V) I wish to add about 96W ...
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1answer
175 views

How Much Heat will a 1800 Watt Bulb Produce?

I plan on placing a Metal Halide 1800 watt bulb 20 inches in front of me (not exactly in front but over my head) - will this produce more heat than I can handle? Someone said the question was vague ...
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How to Drain Heat from a High Intensity Lightbox (2200 watt)? [duplicate]

As you may know, I'm working on designing a "lightbox" that will contain 3 high intensity metal halide bulbs - consuming a total of 1600 - 2200 watt. The purpose of the box is to generate ~40,000 lux ...
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3answers
158 views

Anything Wrong with my Light box Design?

I am creating a custom box that will contain 3 * 400 watt metal halide bulbs (1200 watt total). The box will remain closed for 60 minutes, open for the next 60 minutes, then closed, then open and so ...
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2answers
138 views

Can I safely place a 60w between a 50w LED and a large heat sink that can dissipate 100 watts?

Today I have learned that Peltier devices can be used to generate electricity. I have a set up with a 50 watt LED which is glued to a very large heat sink that cools it without any fans (that can ...
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2answers
145 views

TO-220 rectangular washers

The recommended way to mount a TO-220 package is to use a spring clip or bar pressing on the body of device. But the package was designed to be mounted using a bolt through the hole in the heatsink, ...
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64 views

Cooling the IC on a board printed by hand

I'm building a battery charger circuit with BQ24278. The battery draws 500mA minimum and 2.5A maximum current; therefore, I must prevent IC from overheating. I printed the board onto single sided ...
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1answer
239 views

L705CV Voltage Regulator Overheating [duplicate]

The L805CV voltage regulator is capable of producing a consistent 5v 1.5A draw. I am creating a small raspberry pi case and have a 12v 3a power supply to accomplish the project. I am powering a 12v ...
4
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2answers
649 views

Can I use LEDs without PCB?

I recently purchased LEDs on ebay that were supposed to come attached to star PCB (as a heat sink). The items I received are just the LEDs (no PCB). They are listed as 3W LEDs, with a forward voltage ...
2
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2answers
218 views

Can I solder high power 1W LEDS on aluminum with 60/40 solder? [duplicate]

I want to create my own light source using high power 1W LEDs. Can I solder high power 1W LEDS on aluminum with 60/40 solder? Here's a picture of a potential heatsink
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138 views

Can the metal tab at top of a TO-220 package be cut off?

I am using a TIP120 Darlington transistor in a through-hole (specifically TO-220) package, in a very simple application which does not generate much heat. I remember reading that the metal tab at the ...
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2answers
132 views

Heat transfer tape, or paste, or nothing

I am installing a bunch of LM317 and LM337 regulators in TO-220 package. They will have 2 heat sinks on them each. Occasionally they will have to run close to their maximum continuous rating and can ...
2
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1answer
212 views

Thermal grease / adhesive: Higher Conductivity & Lower Impedance or vice-versa?

I have been reading a fair bit about Thermal grease & adhesive comparisons. There is a lot of information out there - even including tests made with tooth paste(!), which is mind blowing for me. ...
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1answer
144 views

is CFM additive?

I currently have a heatsink with 1 (loudish) 1000-1500 CFM fan. If I was to put 2 quieter 500-750 CFM fans on either side of the heat sink, would they effectively push the same amount of air? It is a ...
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2answers
232 views

How do I interpret this thermal curve graph for my heatsink?

Datasheet of heatsink. The heatsink says it's thermal resistance is 24K/W. Let's say my device dissipates 5 Watts. Assume a perfect conduction from the case to the heatsink, and junction to case is ...
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1answer
281 views

How can I mount a DS18B20 tempreature sensor to a large heatsink?

I want to monitor the temperature of a large peltier element's heatsink to control a fan. I think I'm going to use a DS18B20. The 3 pin TO-92 looks like it's plastic, so I'm already worried about low ...
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2answers
147 views

Looking for an efficient audio amp circuit

It seems like all the circuits that I find are using outdated and inefficient technology that requires massive heat-sinks at anything beyond headphone levels. Is there any particular reason that there ...
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246 views

Will these heatsinks be sufficient for my mosfets?

I need to control 10 12VDC motors at ~25Amps, so I decided to make my own mosfet H bridges to control it ( with 2 n chan et 2 p chan ). I will need 10 H-Bridge, so 40 Mosfets. ( 20 n chan and 20 p ...