All Questions
20
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 ...
0
votes
1
answer
37
views
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/...
- 1
3
votes
2
answers
703
views
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 ...
- 633
0
votes
3
answers
547
views
Heatsink needed to keep my resistor from damaging due to heat
I am looking to find an appropriate range of heatsink selections to maintain my resistor from damage due to heat. I am using a flat plate (SS) resistor from ARCOL (TFBR900). It is rated for a 900 ...
- 3
0
votes
2
answers
292
views
Heat sink sizing for LDMOS
There are many heatsink calculation Q&A's on SE that I've looked through. One very reasonable answer tells me that I can calculate heatsink C/W as follows: $$\frac{T_j - T_a}{P_d} - R_{JC} = R_{...
- 2,088
0
votes
1
answer
101
views
how to use TO-254 Power MOSFET and DIODE's full current capacity? [closed]
I want to know how I can utilise full current capacity of a TO-254 power MOSFET or diode while using it on a PCB.
Presently I'm not able to utilise it completely, due to the limitation of the number ...
0
votes
2
answers
610
views
How fast will a resistor heat up under high power?
I am building a circuit for some induction coils on a coilgun, and it will draw about 1.75A from a 12V power source (I know it probably won't be very powerful, but it is difficult to find resistors ...
- 111
0
votes
2
answers
167
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 ...
- 7
3
votes
3
answers
2k
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 ...
- 195
1
vote
1
answer
173
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}. ...
- 11
0
votes
1
answer
86
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 ...
0
votes
2
answers
203
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 ...
- 1,505
0
votes
2
answers
313
views
Intermittent power dissipation calculation on TO-220 package
For a certain application I will be using this resistor. I might also go for this other resistor if needed.
The working conditions are:
Ambient temperature (max): 70 ºC
Power to be dissipated: 15 W
"...
- 463
0
votes
2
answers
866
views
MOSFET's getting too much heat up without any load
I am working on inverter, MOSFETs in h-bridge inverter goes heat up without any load attached. I also attached pull-up and pull-down resistor on it. here is my circuit duagram.
EDIT
Sources of PMOS ...
- 124
0
votes
1
answer
93
views
Selecting power resistor
I want to build a thermostat and I'm not sure what power resistor to choose. The thermostat will be build inside a broken microwave oven. The resistors will be connected to 230V AC and they will be ...
- 1