All Questions
53
questions
1
vote
1
answer
83
views
How large would my heatsink need to be for the IRLB4132 at 12.6 V and 60 A
I'm building a power distribution board (PDB) for my drone, which is powering 4 ESCs and an Arduino 33 BLE Sense Rev2.
I’m using a 3s LiPo battery which provides 12.6V at max charge. My ESCs are rated ...
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
2
votes
1
answer
158
views
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/...
- 149
1
vote
0
answers
60
views
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'...
- 21
2
votes
0
answers
85
views
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 ...
- 21
0
votes
0
answers
38
views
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 ...
- 15
3
votes
1
answer
622
views
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 ...
- 31
1
vote
1
answer
137
views
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 ...
- 11
5
votes
3
answers
2k
views
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 ...
- 532
0
votes
1
answer
151
views
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 ...
- 51
0
votes
1
answer
110
views
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 ...
- 1,072
0
votes
1
answer
275
views
How should fuses be used for MOSFET temperature protection?
I am using high voltage MOSFET in TO-220 package with a heatsink like this one:
Under normal conditions, the temperature of heatsink does not exceed 90 degrees.
My MOSFET can run up to 120 degress ...
- 55
2
votes
3
answers
939
views
How does junction to case thermal resistance depend on PCB?
Shouldn't the junction to case (top or bottom) thermal resistance depend only on package or IC internals? How do the PCB details play a role as mentioned in footnote 1?
- 3,032
2
votes
1
answer
601
views
How to remove and replace fiberglass based thermal conductive adhesive tape/sheet on heat sink
I'm working on troubleshooting a PSU and came across a fiberglass like thermal conductive adhesive tape/sheet (soft beige) in between the TO-220 power MOSFETs and the heat sink as shown in the photo. ...
- 121
3
votes
2
answers
2k
views
Can PCB dissipate heat from MOSFET so that a heatsink is not needed
I am using a DMP3007 as a reverse polarity and over voltage MOSFET. The maximum planned load is 10 A and voltage may vary as the load is a constant current load.
simulate this circuit – ...
- 1,944