Skip to main content

Questions tagged [power-dissipation]

Anything related to power dissipation in electrical and electronic circuits and components, i.e. the process in which electrical energy is converted to heat when current flows through them.

Filter by
Sorted by
Tagged with
4 votes
2 answers
404 views

Understanding the discrepancy between Input and Output power in ZVS Induction heater

I am using a ZVS induction heater like this: Image Source The schematic looks akin to this (schematic has not been tested) Schematic Source I modified it with IRF3205 N-Channel MOSFETs for better ...
15 Volts's user avatar
  • 707
0 votes
2 answers
60 views

Load sharing effect on heat dissipation [closed]

In a circuit, when two ideal components are used in parallel instead of using just one (same component in both cases), does it have any effect on any of the temperature values? junction / case / ...
kellogs's user avatar
  • 1,061
6 votes
2 answers
327 views

Are my power calculations on this MOSFET Power Amplifier accurate?

Thanks to the help of electronics.SE, I've designed my first power amplifier, intended for transmitting CW on 7 MHz. Before I order parts and build it, I'd request a design review. One important note:...
SRobertJames's user avatar
  • 1,135
0 votes
4 answers
106 views

Op-amp power dissipation

I would like to use an LT1210 op-amp with a +/-12 VDC supply. The input is from a signal generator (10 Vpp, 400 Hz sine wave). The required circuit output is 5 Vrms (14.01 Vpp), 400 Hz and drives a ...
Ariel Narboada's user avatar
0 votes
1 answer
77 views

How Does This Diode Affect This Circuit? [closed]

I am learning about electrical engineering and have a question about this circuit. I don't have a very niche question, I'm just wondering how the circuit is affected by the addition of the LED. You ...
Sqidy P's user avatar
  • 67
7 votes
1 answer
970 views

TO-220 vs TO-3 advantages/disadvantages

Simple Question: What are the advantages and disadvantages of TO-220 package vs TO-3 package in different applications/power requirements? Is there a best route?
Klumpy7's user avatar
  • 392
3 votes
2 answers
258 views

Maximum voltage applied to the BJT base

I have a functional circuit designed for return line reverse protection, and a relevant portion of the circuit is shown below: simulate this circuit – Schematic created using CircuitLab In this ...
chami's user avatar
  • 524
2 votes
2 answers
755 views

How much power in an IC to feel hot

Is there any rule of the thumb at which power dissipated in an IC one should be able to feel that it is hotter than the other components? More specifically, I have a "signal" that should ...
Sandro's user avatar
  • 7,697
0 votes
1 answer
233 views

How to calculate power dissipation due to heat in an amplifer like LNA?

I'm trying to calculate how much power dissipated as heat in an amplifier like LNA. Let's say a HBT device operates at 4.8 V with 80 mA operating current. Gain of the amplifier is 25 dB, OP1dB = 16 ...
Aparna B's user avatar
  • 340
0 votes
1 answer
74 views

Mosfet Switching Energy

How can I calculate the energy required to switch a Mosfet knowing the peak power, and the drain to source capacitance?
Mr. Blue's user avatar
0 votes
0 answers
35 views

How to estimate the temperature rise in an enclosed space due to power dissipation? [duplicate]

I am planning a battery maintenance system that discharges a battery to a storage-compatible state of charge if the battery is not used for some time. I would ideally like to dissipate 4kWh over 15 ...
ARF's user avatar
  • 5,219
0 votes
3 answers
102 views

Reducing linear regulator heat via series resistor

I'm working on a project that uses four L293D motor drivers to control three stepper motors and one DC motor. Separately, there is also a small servo motor. The L293Ds receive a 6V motor supply ...
E.HP.S's user avatar
  • 349
2 votes
2 answers
168 views

How to calculate area using the V-Q Lissajous method

I am doing research on carbon conversion using the high voltage plasma method. In my research there is one problem, namely calculating the dissipation power where one of the parameters is determining ...
Cristian Agung P 1907156221's user avatar
0 votes
2 answers
65 views

Darlington configuration using BJTs [closed]

Does a Darlington configuration using two BJTs, say a BC548, override the total power they could dissipate?
imran muhd's user avatar
0 votes
0 answers
43 views

Power dissipation of PCB trace resistor in current limiting application

How to I calculate the width of a PCB trace to survive use as a current limiting sense resistor? I'm looking at a low-side current limiting application like that shown in the schematic. The value of <...
learnvst's user avatar
  • 1,341
0 votes
0 answers
61 views

Finding memories power dissipation

Can someone tell me how to calculate the power dissipation of digital ICs like NAND Flash, QSPI NOR Flash and microcontrollers?
sushmi Ram's user avatar
0 votes
0 answers
80 views

Best way to heatsink many exposed copper polygons, avoiding electrical shorts

I'm working on a special type of lamp that uses 10 high-power SMD LEDs and 10 low-power TH LEDs. The heat dissipation will be an issue, so almost the entirety of the PCB is copper pours for the SMD ...
anrieff's user avatar
  • 5,469
0 votes
0 answers
44 views

How can I compare thermal behaviour between two packages with an equivalent resistors circuit?

I want to make a thermal analysis of QFP and BGA packages for a microcontroller. I know that in terms of thermal dissipation BGA is a worse election, but I want to know how much worse it is. I don't ...
Developing Electronics's user avatar
14 votes
8 answers
6k views

How much of the power drawn by a chip turns into heat?

If I have a circuit with a computing chip drawing 1W, how much of that gets turned into heat? EDIT: I mean turned into heat 1. straight away (not in 1000 years) and 2. within the vicinity of the ...
asac's user avatar
  • 249
0 votes
2 answers
153 views

Is my heat sink properly sized for my LED strip?

I am looking for some help in sizing a heat sink for an LED horticulture light I am building. I will be attaching two Bridgelux BXEB-L1190U-30G3000-C-C3 LED strips side by side, link below to specs, ...
Chuck's user avatar
  • 1
1 vote
3 answers
98 views

Heater (resistor) combination to achieve specific power

I am designing a heating circuit composed of ceramic heating resistors. I have a 24 V supply and I am limited to 3 A, which allows me to disipate total of 70W, which is my target. I have a limited ...
Lukáš Řádek's user avatar
0 votes
1 answer
158 views

Help with determining power dissipation of resistor in parallel

I've been struggling with this question for a while for some reason, even though it seems much easier that it should be. The question asks for the power dissipated in resistor R (the one in the middle)...
Krys's user avatar
  • 39
0 votes
2 answers
101 views

Thermal issues when converting high power using a low drop out linear regulator

We are looking to develop a circuit that will reduce 12 V to 5 V @ 5 A using a low drop out (LDO) linear regulator. The best device that I found is the MIC29751-5.0WWT. The heat parameters for this ...
Gal Magen's user avatar
0 votes
0 answers
65 views

Can the heat be calculated in a DC voltage drop circuit?

Can the heat be calculated in a DC voltage drop circuit? 24 V, 150 Ω, ~100 mA. The first resistor was 1/2 W, the new one is 5 W. We want to know the expected heat for the new resistor. Looking to ...
Austin Williams's user avatar
0 votes
1 answer
96 views

Heat management in multilayer board

I need some help designing proper thermal management for my board. It's a mixed analog-digital circuit, the analog part is noise sensitive. I have +/- analog supply, and a + digital supply. Several of ...
user2844665's user avatar
1 vote
3 answers
154 views

AD22103 temperature sensor seems to be heating itself up

The picture shows a AD22103 sensor on a prototype board for a room temperature control. The sensor is intended to measure air temperature, not the board temperature. There was originally a ADT7410 ...
REPuzzle's user avatar
  • 145
4 votes
2 answers
798 views

Voltage regulator not heating up ... How?

I connected a L7805 to a water fountain that I measured to be consuming 0.1 A at 5 V to regulate power coming in from three 5 W, 12 V solar panels connected in parallel. The regulator is not heating ...
Reuben Miro's user avatar
1 vote
0 answers
45 views

Junction temperature vs transient current

I'm using the OPA551PA amplifier to charge a capacitor to various voltages. After thermal calculations, the worst case scenario is depicted here. TA = 40C, Vin = 36V, Vout = 18V, Iload = 50mA. Under ...
AJ_Smoothie's user avatar
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/...
khatus's user avatar
  • 1
2 votes
1 answer
198 views

Which consumes less current in microcontrollers: Always HIGH pins or always LOW pins?

I am driving a P-MOSFET (IRLML6402) with ATtiny24A microcontroller. This is a battery powered system; that's why ATtiny is always on sleep. I originally configured a BJT which is driven by the ...
CaveScientist's user avatar
2 votes
1 answer
142 views

Maximum allowable AC voltage for film capacitors as a function of frequency

For a project that I'm working on, I would like to generate an oscillating magnetic field. In order to achieve this, I would like to create a series LC circuit with multiple film capacitors in series ...
Mantabit's user avatar
  • 343
1 vote
1 answer
226 views

SOA and varying VDS

In a hot-swap application the FET spends some time in the linear region/Saturation region before it moves into the ohmic region. Here is a snippet of the turn on waveform seen for a FET: Yellow is ...
Hasman404's user avatar
  • 757
2 votes
5 answers
276 views

I calculated the power loss of a switching regulator and it doesn't match the datasheet. Am I missing something?

I'm trying to figure out how On Semi's LM2575D2T-5G is only 77% efficient. It's the fixed 5 V output version of the component. The datasheet gives Vin = 12 V and Iload = 1 A. Based on this, power in = ...
Rick Bocola's user avatar
6 votes
3 answers
16k views

Is there a general rule to calculate heat dissipation of electronic equipment?

Is there a general rule for calculating heat dissipation in electronic equipment if it's not listed in the specs? I have a couple of projects coming I'm working on that require this. For one situation ...
Frank's user avatar
  • 293
1 vote
1 answer
271 views

How to calculate power dissipation for an MT3608L current-mode step-up converter?

I'm using an MT3608L with an input voltage of 12 V to create a voltage of 18 V using the below schematic. As this is a cutout of a larger schematic, the input voltage is applied to the top left wire, ...
Hans Billiet's user avatar
1 vote
1 answer
139 views

K155ID1 power dissipation

I build my own nixie clock with four digits (IN-14, 10k anode-resistor) with a seperate K155ID1-IC for each digit (so no multiplexing). Also, I am only using the 0-9 range, so every tube has one digit ...
verfelixt's user avatar
1 vote
3 answers
242 views

Efficient Voltage Divider Battery Monitoring for 42V system

I'm designing a system that is powered from a 10S2P LiPo battery pack and I was looking for an efficient way to monitor the battery level. My microcontroller is 5V logic level, and I understand I can ...
Barnabas Nomo's user avatar
1 vote
0 answers
236 views

Is it bad practice to connect a heatsink to my PCB's ground plane?

So, basically, I have this LED project which is going to dissipate lots of heat (I am assuming close to 50W) inside a case. The LEDs themselves are on a separate aluminum board which will be attached ...
alexoiunt1's user avatar
0 votes
3 answers
92 views

Current limiter for VOD3120AB

I want to supply VOD3120AB with a voltage of 24v/2A from Power Supply. What is the value of the Resistor that I must add to the VCC of the VOD3120AB so that the VOD3120AB works properly? Information ...
Ihdina's user avatar
  • 107
2 votes
3 answers
886 views

Power loss and voltage drop for a parallel wiring system

I'm looking to power a 50W load approximately 140m away using 48V DC. At the far end I will use a DC-DC converter to convert this to 12VDC where it will power a small DC powered network switch I have. ...
Brandon Kellett's user avatar
2 votes
3 answers
716 views

Calculate power dissipation of split-supply op amp for sinusoidal input

I want to calculate the total supply current and power dissipation of an op amp in a non-inverting voltage follower configuration with a split supply: simulate this circuit – Schematic created ...
TypeIA's user avatar
  • 2,426
1 vote
0 answers
42 views

Buck regulator thermals calculations

Schematic: Specification: Vin = 24V Vout =5V Iout max = 8A Freq = 0.691 Mhz Assumptions: Good layout and FETs mounted on 1-2 inch^2 of copper. Calculations based on this doc: https://www.ti.com/lit/...
Hasman404's user avatar
  • 757
2 votes
0 answers
566 views

Calculation of power dissipation of a MOSFET circuit

As a part of an assignment to design a common source amplifier, I came up with this circuit: simulate this circuit – Schematic created using CircuitLab The transistor is a 180nm technology with ...
KaBe2003's user avatar
0 votes
8 answers
810 views

Using 110 Vac incandescent light bulb at 220 Vac with a series diode

I have a 110 Vac incandescent light bulb but I need to use it in 220 Vac. If I add a diode in series with the bulb, the RMS power is the same as before but the peak value of voltage and current is ...
M Nasr's user avatar
  • 11
2 votes
1 answer
1k views

About power dissipation of capacitors and inductors & I-V phase difference

For instance, The Art of Electronics (by Horowitz & Hill) states that ideal capacitors cannot dissipate power, even though current can flow through them, because the voltage and current are 90° ...
Rintala's user avatar
  • 33
0 votes
1 answer
129 views

Does voltage drop resistor affect power dissipation?

I need to power an RFID from 24 V DC voltage. The RFID requires max. 9 V and max. 120 mA. The RFID suggests a 7809 linear voltage regulator. I thought too much and I want to use a 7809 because if I ...
Tryingtogetsome's user avatar
1 vote
0 answers
150 views

Mosfet power dissipation in this example

I am trying to design a buck regulator with the following specification: Vin = 24V Vout = 5V I max = 8A Fsw=300k. The load is basically a long strip of RGB LED's. Which in certain cases would be all ...
Hasman404's user avatar
  • 757
1 vote
1 answer
368 views

Is there a "rule of thumb" for power dissipation of an enclosed circuit to help determine when to do a thorough analysis?

I'm starting a project and the electronics will be enclosed in a wood sign outside. Even though it's shaded, I'm concerned about heat buildup in the summer. Is there some rule of thumb that says if ...
Adirondack Jim's user avatar
0 votes
2 answers
561 views

LM317 is dissipating too much power

I used an LM317 in my circuit to get a regulated 1.5 volts output from a 3.7 volt battery using two resistors (220 and 60 ohm.) It worked fine, but the circuit dissipated too much power even when not ...
Asmat Ali's user avatar
  • 333
0 votes
2 answers
606 views

How to calculate the pulsating current flowing through a shunt resistor?

If the current flowing through the shunt (0.5 ohm) is in pulsating form (PWM with 50% duty cycle and 100 Hz frequency,) how do I calculate power loss through shunt in order to choose proper for ...
APX100's user avatar
  • 71

1
2 3 4 5