All Questions
30
questions
1
vote
2
answers
109
views
how to make heat sink under heat pads in kicad 7
Retired user here that have not designed a circuit in the last 3 years.
So I got myself KiCad 7 and boy oh boy things have changed!
Mostly for the better, but some things I used to do are now a real ...
- 21
2
votes
2
answers
664
views
Cooling IAUC90N10S5N062 MOSFET from the top
I design a sync - buck converter, and I need to cool down my top side and bottom side MOSFETs. For mechanical reasons, it is easier for me to place a heat sink on top of plastic housing of MOSFETs (...
- 21
1
vote
3
answers
329
views
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 ...
- 33
0
votes
2
answers
165
views
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 ...
- 1,061
0
votes
2
answers
159
views
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 ...
0
votes
1
answer
345
views
How can I specify in Altium to leave out the dielectric layer for a portion of the board?
I am trying to replace the dielectic layer in just a portion of the board and instead have that just be more copper. The idea is to essentially allow the PCB to use anything it lays flat on to be a ...
user298907
1
vote
1
answer
430
views
Copper Weight/Copper Pour Usability in Thermal Management
I'm trying to think of a way to decrease the temperature that my PCB is running at, but I don't want to add a heatsink if I don't have too since I want this board to have as low of a profile as ...
- 1,195
1
vote
1
answer
1k
views
LM2596 Heat Sink
I’ve designed a DC-DC step down circuit based on the LM2596 regulator to replace a battery in a project. The circuit steps down a 12V supply to 3.9V and is used to power a module which draws 500mA, ...
- 37
1
vote
0
answers
58
views
Heatsink Question
Ok so I have designed a circuit and drawn up its PCB and I have a slight question about the heatsink I'm going to use.
Now you'll see in the images below the place where I generally want to place my ...
- 21
1
vote
3
answers
761
views
TO-263S heat dissipation
I'm designing a mosfet PWM device with a rather high current. According to my LTspice simulation the mosfet has an average power dissipation of 20W. The mosfet had a TO-263S package ( https://fscdn....
1
vote
1
answer
306
views
Which insulating tape and when?
There are quite a few tapes out there, from the plain black electrical tape to different color variations to Scotch 33+, 77, 88 to Kaptons (polyamide), I have also seen some velcro type wraps which ...
- 911
0
votes
1
answer
190
views
Multiple devices on a heat sink
I am mounting multiple devices (TO-247) on a large rectangular heat sink. What difference does it make to mount them on the edge of the heat sink vs. the middle?
2
votes
1
answer
160
views
Modify PCB Mains Voltage input to 12VDC
One of my amplifiers has died so I need to find out if I can hookup a spare I have lying around as per "Section B" of the below block diagram.
I have done the same modification before on ...
- 21
0
votes
1
answer
81
views
Choosing a non specific heatsink
I am designing a PCB board, and it has lots of components on it. It has like 8 MOSFETs, diodes, fuses, current sensors, a STM32 and other components, and with an exception to a few (like mosfets and ...
- 11
1
vote
3
answers
372
views
Calculating PCB temperature increase
so I have created a PCB with a lot of components on it, its a rather large PCB, roughly 18cm x 19 cm. A lot of the components' datasheets (things like Resistors, Switches, capacitors, relays, CAN ...
- 11