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Diode Power Dissipation

I am having trouble solving this PD question. I feel like it’s straight forward but I can’t seem to get the correct answer. I was curious if I could get help from the community. Question: A p-n diode ...
Mr. Blue's user avatar
9 votes
3 answers
1k views

Technical explanation desired: are TVS safe for continuous dissipation? Why/why not?

In answers such as this one, https://electronics.stackexchange.com/a/647135/311631 I've seen suggestions that TVS diodes are not "reliable" under repetitive or continuous operation, such as ...
Tim Williams's user avatar
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-1 votes
2 answers
111 views

Do transistors require heat sink if they are used only as a switch, and not as a dimmer? [closed]

Switching 12V2A, every 2 minutes, TIP122.
uOcool's user avatar
  • 13
1 vote
1 answer
51 views

Heater - how to define power needed taking into account air thermal dissipation

My objective is to heat a liquid inside a bottle. I have a air gap of 2 cm between the bottle and the heating element (resistive layers). The heater and the bottle is surrounded by a bottle insulator, ...
Armand's user avatar
  • 21
0 votes
0 answers
1k views

Calculate Power Dissipation of an IC

I am trying to calculate power dissipation of the IC for thermal analysis of the PCB. I have calculated the power consumption but not sure which current values to be considered for calculating power ...
user1890's user avatar
1 vote
1 answer
3k views

Thermal pads, their thickness and conductivity

I would like fo know how do thermal pads work, more specifically why does their thickness matter so much even more so than their actual conductivity numbers sometimes and how do I choose the proper ...
appwizcpl's user avatar
  • 911
0 votes
0 answers
54 views

Determining which fuse to use and where to put it

I've been working in my thesis project which consist on a PID controler to mantain a certain temperature in a case. The heater module is made of two 40W-12V 3D printer resistors and one 15W-10 Ohm ...
Shupper's user avatar
  • 35
0 votes
1 answer
403 views

Power dissipation of TLC6C5712-Q1 LED Driver IC

I am using this TI LED Driver IC to drive 9 LEDs I want to calculate the Power Dissipation of the Resistor (20k 1% 0402) which I have connected to the IREF pin. To calculate the power dissipation of ...
user avatar
0 votes
1 answer
74 views

How do I calculate the capacitance in this circuit?

I can't find any source online to how I can calculate the capacitance in this circuit, the previous questions seem solvable, but any help would be appreciated thank you!! Here’s a formula I found, ...
radioactivedecay's user avatar
0 votes
2 answers
216 views

Possibility of dissipating 20 W via Nichrome wire safely

I am looking to use 1 foot (0.3 meters) of 32 AWG nichrome wire to dissipate roughly 20 watts of power. Assuming the wire was submersed in still transformer oil, would I be able to do this without ...
James Li's user avatar
1 vote
1 answer
1k views

Calculation of Power Dissipation of Memory ICs and Microcontrollers

Can someone tell me how to calculate the power dissipation of digital ICs like Nand Flash, QSPI NOR Flash and Microcontrollers? For Microcontrollers, we can get the power dissipation for GPIO like, ...
user avatar
1 vote
0 answers
50 views

Energy dissipation in a circuit with only capacitors [duplicate]

Context: Consider a circuit with only two linear time invariant capacitors. If I charge one the capacitors and then throw a switch that closes the circuit, there will be some redistribution of charge. ...
AkaiShuichi's user avatar
1 vote
2 answers
238 views

Best practices for a phenolic spacer design to facilitate heat transfer?

I am making a hand held electronic device that includes a 0.8mm phenolic spacer/electronic insulator between the PCB and the inside/bottom of the case. This spacer is made from epoxy resin and is ...
redeyedjim's user avatar
0 votes
1 answer
29 views

Time it takes for B to go to zero with R and L given

Given that your solenoid has inductance L and resistance R with initial current I such that there is uniform B inside the coil, I would like to figure out how much time will pass before B goes to zero....
Blackwidow's user avatar
0 votes
2 answers
2k views

LCD Backlight Control Circuit

I'm trying to control the back-light of a TC1602A-09T 16X2 Character LCD by using an output pin on a Teensy 3.2 microcontroller. This is the circuit I have at the moment: The LED- pin would be ...
Andrew Schroeder's user avatar
0 votes
2 answers
2k views

Heat dissipation zener diode and resistor

I have the following circuit When I am testing the circuit with 5V USB 3.0 power supply, the zener diode and/or resistor does not build heat up. Using the 18650 7.4V battery makes it build heat. The ...
Brian Jacob Sanchez's user avatar
0 votes
1 answer
168 views

Dynamic power dissipation of a Cmos inverter with relation to it's geometry

I know that the dynamic power dissipation of a CMOS inverter is defined by the equation: Pd = (Cl)(Vdd^2)(fb). My teacher challenged us to find ways to reduce power dissipation besides the obvious ...
quaresmatic's user avatar
0 votes
1 answer
1k views

Off-load voltage of wall-warts

I need to regulate an incoming DC supply from a wall-wart down to 5 volts. I'm experienced with designing power supplies with ordinary transformers. In this situation, the maximum voltage I can expect ...
Foxie's user avatar
  • 221
0 votes
2 answers
840 views

Help to calculate heat dissipation on plastic dual in line DIP package (DIP-8 opamp)

Question is about maximum chip heat dissipation (and not about efficiency or correctness of this design). Circuit is quite simple: put in parallel 30 Dual Opamps in 8 pin DIL package (i.e 60 opamps ...
Gianluca G's user avatar
14 votes
2 answers
1k views

How does static dissipative foam work?

I am planning to build a grip-release sensor using the foam. I'm pretty interested in the way it works. Does the resistance in circuit increase or decrease when force is applied onto it? And this will ...
Karl Stark's user avatar
12 votes
4 answers
2k views

Book Suggestion - How to calculate the power dissipation of a BJT

I did a exam that asked for "power dissipation" of a given BJT circuit. The question was simple but my professor considered my calculation of dissipated power wrong, because my answer was \$P = V_{CE} ...
Luis's user avatar
  • 121
0 votes
1 answer
4k views

Total power consumption in LTSpice

I know how to measure the average power dissipated on a component but I have a very big circuit with lots of components so I am looking for a short way to calculate the total avg power in the whole ...
eleelo's user avatar
  • 25
0 votes
1 answer
888 views

Power dissipation in a Darlington built with an optocoupler and NPN

I have implemented a PWM control over a relay from an Arduino. To isolate both circuits I have used an optocoupler 4N35 from Vishay. Since it cannot provide enough current flow to drive the relay, I ...
Salus 's user avatar
4 votes
2 answers
540 views

Does a transistor/FET dissipate more power with a freewheel diode?

My question is: Does the transistor dissipate more power because of the freewheel diode? Ifso, why? simulate this circuit – Schematic created using CircuitLab
Toon Van Eyck's user avatar
2 votes
3 answers
144 views

Power used by a PLC for communication

I am working on a PLC (Programmable Logic Controller) that receives input from four pressure sensors (4-20mA) and a proximity sensor. Two of the outputs actuate relays. The PLC communicates via Modbus ...
ChrisFord's user avatar
17 votes
4 answers
3k views

125 mW resistor subjected to 600 mW dissipation in professional safety system

The schematic below is the input circuit of a signalling PCB, which we buy from one of our suppliers of fire detection systems. Said PCB has to be built into a so called geographic evacuation panel ...
Bart's user avatar
  • 885
0 votes
2 answers
1k views

Typical dissipation constant of average thermistor?

What is the typical dissipation constant of average thermistor? I.e. how much current I can feed to thermistor without significant self-heating? I know that I can measure exact value for particular ...
sergey.raevskiy's user avatar
-3 votes
2 answers
76 views

voltage-energy input and voltage drop energy taken away

i want to understand voltage. voltage across a battery is the energy per charge that the battery can provide. if we give more charge inside the battery we can get more overall energy in the battery ...
intuitive understanding's user avatar
0 votes
2 answers
360 views

MOSFET getting hotter than calculated

as the title said, I'm facing this problem. I'm controlling a Peltier element (91.5W at 15V, what should give us aprox. 4A at 12V) with two different MOSFETs: IRF3205 (Rds(on) = 8 mOhm) and FQP30N06 (...
Stephen S. Madeira's user avatar
1 vote
1 answer
1k views

Heat dissipation Aluminum PCB

I'm not sure how to calculate the following. I want to SMD solder either 3 LEDs or 6 LEDs to an aluminium core PCB. The LEDs in question are PK2N (datasheet) and, according to the datasheet, the ...
made2hack's user avatar
7 votes
1 answer
3k views

How to estimate the required PCB surface area for SMD power resistors

I am migrating a design from through-hole parts to use as many SMT devices as possible. There are 7- 2 Watt power resistors in the current design. These are metal-oxide resistors that have crimped ...
Dwayne Reid's user avatar