Questions tagged [heatsink]
A heatsink dissipates heat into the surrounding air and thus provides cooling.
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Why are resistors so frowned upon in use as step down circuits for LED lighting? [closed]
Novice enthusiast here, I have a question that my trade electrician friends can't answer.
I've read on many forums and in internet searches that resistors waste the voltage/current dropped across them ...
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Heat sink calculation for multiple heat sources connected to a single copper plate
I have 2 switches, both are thermally connected to one copper plate. One switch has heat resistance - junction to copper plate = 1.09 C/W and dissipates 6 W of heat. The other has heat resistance - ...
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Advice about power MOSFET layout and heat management
This question is a continuity to my previous one: Weird DC motor behaviour at low PWM duty cycle
Here is my circuit schematic:
The motor is a LEM130 from Lynch Motors (about 2 kW and 50 A rated power/...
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Reducing linear regulator heat via series resistor
I'm working on a project that uses four L293D motor drivers to control three stepper motors and one DC motor. Separately, there is also a small servo motor. The L293Ds receive a 6V motor supply ...
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THT power transistor clamp mounting
I have a question regarding mounting THT power transistors (TO220, TO247...). I am building a output full bridge for a welder and I thought about not using PCB at all for the power terminals (D,S). It'...
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Design of heatsink - increase in ambient temperature during heat transfer
I have gone through few resources available online on how heat flow from die to ambient and how its is modelled as current source, thermal resistance and ambient temperature as voltage source.
I have ...
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Thermal analysis of a step down regulator
LTM8053 datasheet
I tried to plot the thermal graphic (watt-celcius) for this buck converter in MATLAB. The main goal is to find losses which turn into heat. Reasons for heat most of time switching ...
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Best way to heatsink many exposed copper polygons, avoiding electrical shorts
I'm working on a special type of lamp that uses 10 high-power SMD LEDs and 10 low-power TH LEDs. The heat dissipation will be an issue, so almost the entirety of the PCB is copper pours for the SMD ...
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How to apply thermal paste on a large surface (between IMS PCB and heatsink)?
I've got a project that features an array of ultraviolet LEDs on an aluminium board.
This board shall be screwed to a heatsink.
My problem is that I'd like to apply thermal paste to improve the ...
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Estimating junction temperature
I made a measurement using thermocouple to measure the case temperature of my TO-220 linear regulator (L7809). I'll be using degrees celsius for all temperature units and degree Celsius/Watt for all ...
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Heatsink and its thermal resistance parameter
Regarding this heatsink with this datasheet, its thermal resistance is given as .06K/W. It is also written "designed for use with multiple thermoelectric (Peltier effect) coolers".
My ...
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Thermal issues: surface mounted on 1" x 1" FR4 board
A number of parts are rated at certain thermal impedance with a note, something along the lines of
surface mounted on 1" x 1" FR4 board
like in this datasheet for instance - MOSFET Vishay ...
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Is there a rough rule for heatsink size?
Is there a simple rule that could be used to size a heatsink without fan using just the wattage and/or how hot a component would go? I understand heatsinks are in their own universe as there are many ...
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MOSFET TO-220 heat sink pad is electrically connected to drain. Can I solder wire or trace directly onto heat pad, instead of drain pin?
I have a board-layout where a lot of things would be easier if I could solder to the metal-pad of the TO-220 N-channel MOSFET, instead of the drain pin.
Apart from: "Metal pad was intended for ...
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Is my heat sink properly sized for my LED strip?
I am looking for some help in sizing a heat sink for an LED horticulture light I am building. I will be attaching two Bridgelux BXEB-L1190U-30G3000-C-C3 LED strips side by side, link below to specs, ...
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Are TO-220 and TO-247 MOSFET heatsinks compatible?
Are TO-220 and TO-247 MOSFET heatsinks compatible?
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Help understanding heat pipes parameters
I need help understanding heat pipes parameters.
Let's say I need to transfer heat from the heating component on the PCB to the heat sink. For this I want to use a heat pipe. To calculate the final ...
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How to choose a Peltier module and heat sink to cool a MOSFET down to -40°C? [closed]
I need to cool a MOSFET down to -40°C, but I really know nothing about thermal devices.
Could anyone teach me how to calculate the specific parameters that can help me choose the right Peltier module ...
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Can HSG + TIM + HSG sandwich ever be better than one layer of HSG?
Here is a photo of a big diode and it's TIM (thermal interface material.) The foil appears to be aluminum, very thin and reflective, with white, crusty HSG (heatsink grease / paste / compound) on ...
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My IRL540N is smoking
I am using an IRL540N MOSFET to drive a 12 V pump (about 6 A) and a 12 V solenoid valve (about 1 A max). It's smoking after just two uses. I need to know two things.
Is it still alright? It's still ...
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Use Max Current or Inrush Current for MOSFET heat calculations?
I have two different MOSFETs controlling an actuator that is specified to have a current draw of 13A. There is also a note on the actuator datasheet about inrush current stating:
Typically, the ...
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Heatsink for i4-PAC
I'm using a CPC1998J "i4-PAC" solid state relay in a project that needs to fit in a very slim enclosure (e.g. hopefully around 15mm thickness), and I'm having trouble identifying suitable ...
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If I attach the heat sink on the transistor, will switching power loss be lower?
If I attach the heat sink on the transistor, will PWM switching power loss of transistor be lower?
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How to do heat sink calculation, when junction to case thermal resistance is not provided
I am not very knowledgeable, so please bear with me.
For heat sink calculation, you need the junction-to-case thermal resistance of the chip, then the case-to-ambient thermal resistance of the heat ...
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Chart/ table to visualize how hot a device is actually getting
Maybe my question will be a little funny. But it will be very helpful if you can give a little information about one thing. In electronics, we calculate power at various points/calculations to predict/...
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Should I place a Al plate above or below power supply to heatsink to distribute heat better?
I have a power supply mounted on an Al sheet (3mm thick) which is on top of a closet. Considering only heat dissipation, should I place the fanless power supply above or below the Al sheet?
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Practical question: Temperature sensitive device, insulating or add more thermal mass?
If I have a very sensitive photodiode/sensor/analog front end part of a circuit that can be sensitive to temperature and the device does not draw much power (for example, a small photodiode,) what is ...
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How to calculate thermal heat from a switching voltage regulator?
I found this answer here which explains how to calculate the watts that are dissipated in a switching voltage regulator, but once you calculate the watts dissipated how do you know how much ...
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Heat sink designing for an automotive grade motor controller
I am working on an electric vehicle development project. I am using a motor controller to drive a 3 phase induction motor. The motor controllers' input supply is 48 volts, and they sink a maximum of ...
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Gap between heatsink and external plate – help filling this void
I have an electric motorcycle (built two now) that I'm having an overheating issue with. This is a fully from-scratch build (minus the motor, controller and accessories), and I am learning a lot along ...
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How can I calculate how long it will take equipment in an enclosure to overheat?
This is kind of a follow-up question about determining the heat dissipated from equipment based on power consumption.
I have a situation where I have to install a router and UPS system in an enclosed ...
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3 W Power LED without heatsink (350 mA)
Can I use this Prolight Opto PK2N LED at 350 mA without a heatsink?
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Cooling SMDs from the bottom
I remember a clever way to cool a SMD with a thermal pad from the bottom.
It's like a copper pin or a rivet that goes through the board, in a hole right under the SMD thermal pad. Then it has a flat ...
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SMT heatsink makes a hole in the groundplane
I am putting an Infineon TLE8386 boost controller on a board. It uses an external FET, I have selected one in a TO263 (D2PAK) and I am trying to work out the compromise between heat-sinking and ground ...
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Does the direction of the screw for heatsink mounting matter?
I am currently design a high power system transistors in TO220 package.
I am planning to mount those transistors on a metal box that will act as a dissipator/heatsink for the transistors. The walls of ...
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Is it bad practice to connect a heatsink to my PCB's ground plane?
So, basically, I have this LED project which is going to dissipate lots of heat (I am assuming close to 50W) inside a case. The LEDs themselves are on a separate aluminum board which will be attached ...
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Optimizing Peltier water cooler set up
Application
20 gallon aquarium cooler
Ambient temp: ~22C
Tank target temp: ~17C
Tank houses an axolotl and needs to be kept at cooler temperatures then currently in the basement.
Current Peltier Set ...
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What is the purpose of these strange patterns in i/o port panel of GPU card? [closed]
Ref: https://www.techspot.com/article/1988-anatomy-graphics-card/
The left side pattern seems to get it attached to Graphics card slot- but not sure why those flanges are required.
Absolutely no ...
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Where do you find how much heat a heatsink is rated for? [closed]
I have an N channel MOSFET and a P channel MOSFET. I found that for the P-channel MOSFET I need a heatsink that is lower than 5°C/W. The N channel MOSFET needs a heatsink that is lower than 13°C/W.
I ...
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How to maximize heat dissipation on Peltier tiles
I am not an electrical engineer by any stretch of the imagination, but I do like to tinker.
I am building a liquid cooling ramp (also known as an ice luge) liquid gets poured into the top of the ...
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Long term issues with AC/DC converter in always ON application
We have designed an "always ON" electronic home automation device which goes behind the switchboard (inside the wall.) This is the first commercial product that I am designing, so bear with ...
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What is meant by the statement "Local bypass capacitors are needed to control EMC coupling with heat sink"?
During a talk, not sure what the speaker meant by the statement " We need to add local bypass caps to control EMC coupling with heat sink"
He was referring to the MOSFETs in synchronous ...
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Where can I find large thru-hole heatsinks like this? [closed]
I'm doing a project with an OPA541 amplifier, and I need to find a heatsink similar to the one in the pictures:
But I only found small ones with a screw hole and legs for soldering, none of the large ...
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Can a CPU heatsink be used to cool a TO-3P or a TO-220?
I want to know if my thermal design is appropriate for dissipating 72W of heat while keeping the junction temperature below 150 °C (I am trying to cool an SFH154 that comes in a TO-3P package). My ...
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Step-down conversion materials
I have an ac adapter on which I would like to reduce the output, from 24 vdc to let's say 6 vdc. What type of diodes should I use and how many? What about heat dissipation?
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Copper braid as heatsink
Somebody recently asked me about this headlight: https://www.hsd-il.com/products/h7-72w-8000lm-led-car-headlight-bulbs-cree-led-chips-6500k-drl-copper-belt-headlights-12v-24v
Interesting. I'm not ...
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What is the black, finned, metal part in this picture of a board?
Can someone explain what this black part is?
This a WLAN module.
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LED lights become darker? [closed]
I build myself a light with many small LEDs. They are quite powerful. I superglued ever LED board (the LEDs where in parts of 3 on a small circuit board) to an aluminium piece to dissipate the heat.
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Possible fixes to a power supply thermals issue
The question applies to a buck converter design on my board:
Here is a 3D view of this section:
Layout of this section:
L1:
L2:
Layer 3 is power and layer 4 is again a full ground plane.
Here is ...
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Is it safe to connect metal body capacitors with a metal heatsink?
I have multiple metal case capacitors that I need to cool. The thermal tape I use is conductive (carbon based). Also larger heatsink on the left might touch capacitors on the left side. The question ...
