Questions tagged [heatsink]
A heatsink dissipates heat into the surrounding air and thus provides cooling.
302
questions
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38 views
Thermal Resistance of PSU's heat sinks
I have a non functional PC power supply unit, and I would like to keep its heat sinks, but they have no model or part number in them. Is there a way to estimate, calculate or measure their thermal ...
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3answers
100 views
Using a small heatsink with a high power LED (50W)
Description
I want to use a 50 Watt LED like this one (42mm*40mm)
The space to integrate this component is limited. I have only 55mm*55mm*30mm in total.
So the LED + Heatsink size must not be higher ...
0
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1answer
81 views
What temperature should I expect by lighting 3W-LEDs?
I have a PCB with 10 LEDs (reference : SPHWH2L3D30ED4TPK3) which will each dissipate 3 W (forward voltage of 3 V and 1 A passing through). The PCB is a circle with a diameter of 20 cm and LEDs are ...
0
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2answers
72 views
Linear Voltage regulator becomes very Hot when connected to Nichrome wire heater
I'm trying to build a heating element using nichrome wire 24 gauge. I'm using a 12v linear voltage regulator (L7812CV) as a power adopter which is connected to a rectifier bridge providing 19v. When ...
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2answers
57 views
Heatsink design, factors to consider?
I'm trying to design an small but effective heatsink (DIY type), the design that I came up with so far is a 4x4x9cm aluminum square tube with a 12V fan under it blowing up:
poor designing skill...
...
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1answer
76 views
What does these heatsinks do?
I think sharing the video will be the easiest way of describing the situation.
The transistors are electrically isolated from the heatsinks, I have checked with multimeter.
Few days ago, I have ...
12
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4answers
2k views
Should I ground the heatsink?
I am using an npn transistor in TO-220 package, and its collector is electrically connected to the metal part on it. I have checked it via a multimeter. I use a heatsink for that transistor, with ...
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3answers
217 views
Heat Dissipation Calculation for MOSFET
My challenge at the moment is dissipating 60A of load current through an array of MOSFETs.
Here are my specs:
No cooling fans
Heatsinks allowed, if needed
FET and/or heatsink cannot attach to the ...
1
vote
1answer
59 views
Should I apply soldermask over SMT thermal pads?
On page 8 and 9 of the following datasheet, there's a description of thermal pads for this MOSFET: https://www.vishay.com/docs/63302/si2342ds.pdf
What I am wondering is: I will design the footprint ...
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2answers
84 views
Can I use those TO-220 heatsinks with a TO-126 package?
The TO-126 component is this : https://pdf.direnc.net/upload/bd679-datasheet.pdf
Dimensions for heatsink : 19.7 mm - 14.8mm - 9.7mm
I wonder can I mount this TO-220 heatsinks to BD679 or not. The ...
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2answers
77 views
3.3kV isolated heatsink for TO247 packages
I want to use some TO247 devices with an enclosure. In fact, I have to and there is no choice.
The enclosure has to withstand a dielectric strength test of 3.3kV for 10sec plus 6.6kV for 20ms. All ...
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1answer
49 views
Will 5W power on TIP41C/TIP42C require a heat sink?
I do guess it will require but I have never used a heat sink before, so I am not sure.
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1answer
89 views
Trying to get 2 Amps out of 3 Amp Regulator (MIC29302WU)
I am trying to get 5V,2A out of the MIC29302WU (TO-263 package) with an input voltage of 12V. The voltage drops to around 2.2V when trying to supply even 1.3A. Blowing canned air over the regulator ...
0
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1answer
48 views
Arduino RGBW 24v LED strip driver
This might not even be the right place for me to ask, but I hope somebody can help;
I have an arduino mega with 4 PWM outputs (5v, fitted with 220 ohm resistor) that I would like to use to control ...
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0answers
32 views
Bottom solder on the UPS PCB [duplicate]
Today i was looking at PCB of an old ups system.
I noticed that there is a bottom solder pattern on the back side of the PCB, right under the IGBTs
I believe that soldering the high power line on the ...
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0answers
27 views
Thermal resistance of Thermal Interface Material
Can anyone please give information how to calculate the thermal resistance of SIL PAD "TSP A2000" from make Berguist.
from The data sheet its specified thinness is 0.254mm, Thermal conductivity (W/m-...
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1answer
113 views
LF33CV voltage regulator overheating
I'm trying to turn on a laser (3.3v - 4.5v, 100mw) using a 9v battery and LF33CV as voltage regulator(TO220 package, 3.3v output). After 20 seconds the voltage regulator is getting so much hot. I was ...
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2answers
54 views
DIY Power supply kit suggestion (Fan & pull-up resistor, cap)
I bought this 0-30v power supply DIY kit... There is three suggestion I need...
1. I want to use a 12V fan, so I'm changing the 7824 to 7812. So, I'm thinking to change the pull-up resistor (2.2K) to ...
2
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3answers
147 views
Heatsink on top of SMD plastic IC or bottom of PCB?
I often do designing power modules and always wonder if there is some kind of rule how to properly cool SMD devices.
I always look at final products from other companies and some are placing heatsink ...
1
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3answers
191 views
Why does a Peltier cooler heat up when cooled by ice?
On this post, the question presents a problem of a Peltier cooler heating up after operating for a while. The explanation was that the Peltier cooler is only able to maintain a fixed temperature ...
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3answers
131 views
Can I increase the power rating of a film resistor if I increase the cooling?
I am trying to apply 1 kW of heat to an area of 10x10 mm and I am considering using a panel mounted film resistor.
One that meets my power requirements doesn't exist so I am wondering if I can go ...
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4answers
448 views
How do thermal tapes transfer heat despite their low thermal conductivity?
I found myself needing to attach small heatsinks to Mosfets and CC power regulators. Also some high-power diodes.
Today I have learnt that thermal compounds, even best in the market, are dozens of ...
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0answers
17 views
Infineon IPOSIM tool for IGBT thermal loss calculations
I used the infineon IPOSIM power tool for simulating a motor drive for my required conditions and got the results for a custom input drive cycle.
The results were given as power dissipation per IGBT(...
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0answers
17 views
Unexpected battery float voltage in BQ2057WSN charging circuit
We have designed a changing module using BQ2057WSN IC to charge a 7.4V, 6600mAH Li-ion battery. My supply power is 12V,2A SMPS. I have set my charging current to 600mA. The battery is charging, but ...
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1answer
179 views
500V generation, MOSFET Heating Problem
Referring to my previous post. I have successfully generated 500V. The problem I am facing an issue. MOSFET I am using for switching is FQB34N20LTM. The MOSFET is burning badly. The snap of drain ...
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1answer
40 views
Application based Heat sink design for Power diode
Instead of having a heatsink directly connected to the diode, I want to have a 2 mm layer of cold rolled steel in between case and heat sink(aluminium){for waterproofing as needed in the application}. ...
0
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0answers
48 views
BQ2057WSN Circuit Heating issue
We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
6
votes
3answers
755 views
Heatsink on underside of PCB
I have prototyped some DC-DC converter modules, and they work well. However due to size, I don't have a huge amount of copper pour for them to dissipate their heat. I have used 2oz copper but the ...
2
votes
3answers
144 views
Heatsinking considerations for Common Cathode Rectifying Diode
I am using this as rectifying diode in full bridge configuration in one of my power supply designs. My questions are regarding heatsinking of the diodes. They are as follows:
Do I need to use ...
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0answers
21 views
Heat transfer coefficient in a Module Baseplate
Today, for example in a power IGBT module cooled by a heatsink, it has been found that the heat transfer coefficient (htc) distribution may not be uniform across the bottom surface of the module ...
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2answers
104 views
Thermal Glue solvent
I have a PCB with many chips on it - it's a "hashboard" for an ASIC bitcoin miner. There are 63 chips on every hashboard, and each chip has a small heatsink on it.
I tried heating the heatsinks with ...
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1answer
51 views
Is it possible to use Ultrasonic sensor HC-SR04 in continuous power-on mode
I will be using Ultrasonic sensor HC-SR04 in water level measurement. I will be triggering the US sensor and getting back the time-pulse from it at very slow rate maybe once every minute. I want to ...
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1answer
47 views
Representing Heatsinks on board layout
When using CAD software to draw board layouts, is there any convention on how to represent heatsinks attached to, say, some power transistors? I want to make sure they don't interfere with one another,...
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1answer
67 views
If I need to attach a heat sink to a planar MOSFET, to which terminal should I attach it to?
This is a newbie question on MOSFET structure. If I need a heat sink to be attached to MOSFET, it should be closer to the source of heat. Here channel is the source of heat. Hence heat sink should be ...
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1answer
108 views
LD1117V33 voltage regulator heatsink, thermal paste needed?
I want to screw a heatsink to my LD1117V33 voltage regulator. It's a normal 3mm screw and nothing inbetween. Do I need to use thermal paste or something like that?
It will be regulating 12V down to 3....
0
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1answer
77 views
Water-Based Heat Sink
I am trying to incorporate a TEC in a portable system. The heat from the interior of the system needs to be transfered to the exterior where it can be dissipated freely into the environment. Now, I ...
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1answer
153 views
Heatsink pad connected to ground pins
Is it safe to use the exposed heatsink pad of a QFN to also connect the ground pins of the IC? (Like this question, but in my case the pad has many vias connecting it to ground plane.)
Additionally, ...
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1answer
61 views
Electrical insulation resistance of TO-220 package with SIL pad and plastic shoulder washer?
What would a ballpark insulation voltage (HI-POT) rating be for a TO-220 package (with a "hot" tab) mounted to a grounded heat-sink with SIL pad and shoulder washer?
I am not seeing much ...
0
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2answers
199 views
How do I determine the junction-to-ambient thermal resistance?
For a project I'm working on, I was considering using an AS7805 to supply low-noise 5V power to some sensors. (due to the uncertainty that resulted in asking this question, I've since changed to a ...
15
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8answers
7k views
Why are electrically insulating heatsinks so rare? Is it just cost?
Edit: It seems my initial question (Why are there no insulating heatsinks?) was based on a false premise, and there are in fact insulating heatsinks--I just wasn't able to find them with a cursory ...
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0answers
617 views
Tesla coil circuit troubleshooting
Ok so we are making a tesla coil. Here is the circuit diagram we are referring:
Now it worked when we first made this. The light bulb lights bulb when we bring it near to secondary coil. Then we ...
0
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3answers
99 views
Mounting finned flat-base heat-sink with no tabs or screw-holes
The heat sink has a flat base with no tabs or holes.
How is it supposed to be mounted on a PCB?
Wire brackets soldered to the PCB come to mind but then how does one ensure there's enough pressure ...
0
votes
1answer
101 views
LED ULN2803 thermal / heatsink questions
I'm intending to use LEDs of 5mm, which have a max forward current rate at 30 mA, or a value of 100 mA, with 10% 1 kHz duty cycle, in a circuit like the one below except some changes:
STM32F103C8T6 ...
0
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1answer
65 views
Transistor Inverter - when does excessive small wattage become a problem?
I'm trying to choose the best values of resistors given the stock I have so that I can deliver sufficient power and current to an HM-TRP radio module.
In this circuit, I used the 100K resistor ...
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1answer
76 views
How can I install mini aluminium heatsink to wireless card?
I am thinking about increasing txpower of the my wireless card. But I am worrying about the heat can damage my wireless card. My solution is installing aliminium heatsinks on the wireless card.
My ...
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votes
2answers
140 views
install heatsink on BJT
I am facing the problem with the heat of transistor disturb sensor reading. Here the link refer problem
I am using BC548 transistor. It is a bit hot when operating because it disipates power around ...
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4answers
417 views
MOSFET thermal resistance
I am trying to calculate the total thermal resistance of my FET to see what heat sinks are required, are the following calculations correct?
$$ Power = \frac{T_{jmax} - T_a}{\theta_{JC} + \theta_{CA}}...
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2answers
338 views
I want to attach a heat sink to the inductors on my motherboard, which glue could I use? [closed]
If I wanted to attach a heat sink to the inductors on my motherboard, which glue could I use?
I have a Gigabyte A320M-S2H, this motherboard has heating problem when used with the AMD ZRyzen 7 2700X ...
0
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3answers
463 views
Can i get away with a pcb heatsink for a triac?
so, i have a bunch of to-220 L4006L5TP triacs laying around and i have to design an AC phase control pcb, reading the datasheet i saw that the Rθ(J-A) is 50°C/W, the Rθ(J-C) is 3.3°C/W and the voltage ...
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2answers
133 views
Confusion with relating thermal resistance temperature, and electrical power and heat sinking
What is meant by the following?:
In general, a device with a thermal resistance θ equal to 100°C/W will
exhibit a temperature differential of 100°C for a power dissipation of
1 W, as measured ...
