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Questions tagged [switch-mode-power-supply]

A switch-mode power supply (SMPS) switches been fully-on and fully-off states quickly to maintain voltage regulation. They offer lower power dissipation and run cooler than linear regulators that continually dissipate power through a transistor.

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How is slope compensation implemented in the UC3843?

I was reading about slope compensation in the datasheet of UC3843 and I have watched this tutorial on youtube which gave me a general idea and overview about what slope compensation is. Now regarding ...
AbdAllah Talaat's user avatar
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Good Oscilloscope for Power Electronics [closed]

Hoping to get recommendations on a good oscilloscope for testing power electronics in the 20W-240W range. My main use case will be to troubleshoot AC/DC power supplies. A specific need I'm concerned ...
Perry's user avatar
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Distribute power from one battery to multiple devices

I have a battery, Li-po 3300mAh 22.2V 60C. Then, I have a system (main system, so to speak) which consist of STM32MP1 MPU (operating voltage [1.71, 3.6], typ. 3.3), STA8135GA GNSS IC (operating ...
keenan's user avatar
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Basic Buck Converter Analog Control Circuit [closed]

I am trying to design a 5 V -> 3.3 V buck converter as a design exercise and am implementing my own analog control circuit. At the moment I am not considering compensation or loop response as I am ...
fzizzo21's user avatar
1 vote
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30 views

Problem on 5l0380R [closed]

I have a sat recever with this power supply. All rectifier diodes burn and replace them and also 5l0380 R was burned and I change it with a new one but it burn. I checked all components around it and ...
mehryar bushehr's user avatar
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Hook up 2 120 V AC battery backups to breaker box [closed]

I have 2 120 V AC VTOMAN 1800 battery backups. On my main breaker box, with an interlock installed, I want to turn off the main breaker and all dual poles (a/c and dryer), then through a 15 amp dual ...
John G's user avatar
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Buck Average Modelling

I completed average modelling with Voreperian PWM switch model as described in Christophe Basso's book "Transfer Function of Switching Converters" and I compared the average model with ...
Power Path's user avatar
1 vote
2 answers
84 views

How to sample current in high-kHz to low-MHz [closed]

I am working on a project that, at its simplest, is a switching circuit (either a half-bridge or single switch) connected to a resonant filter. I need a way to measure/sample the current going from ...
Joshkoz16's user avatar
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Can I deduce the saturation current of a transformer from the rated wattage and maximum frequency?

I have an SMPS transformer EE10, but am not sure about the saturation current it has, I tried doing some internet research, all what I can get is this so far : I am trying to deduce the saturation ...
AbdAllah Talaat's user avatar
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1 answer
62 views

Help me to identify SMD diodes marked '1DN'

Help me to identify SMD diodes marked 1DN.
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Help me to identify an SMD component marked 'NM' in an SOT-89 package

Identify transistor marked NM:
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What is the mistake in the Current ripple ratio equation?

I was trying to do some research and see some online tutorials to learn designing flyback converter, I have seen this part of that play list , I could deduce some formulas from the video but I had ...
AbdAllah Talaat's user avatar
2 votes
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Input/ Output Impedance of Converter/Input Filter (SIMPLIS)

I'm trying to replicate an impedance plot showing the output impedance of the upstream filter and the input impedance of the downstream converter, but within the sample plot. Can I get help with: ...
RogerDodger's user avatar
2 votes
1 answer
70 views

Swapping CANH and CANL kills my power converter

I got the first set of these CAN boards I designed and I plugged one into my test setup consisting of a two CAN dev boards as seen below. The first time I plugged my board in I didn't realize I had ...
Alex Jegers's user avatar
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Power MOSFET Simetrix simulation using in LLC

I'm trying to model switching losses of an Infineon Power MOSFET (IAUS300N10S5N014) in SIMetrix/SIMPLIS Elements by using in the LLC circuit. But I have some questions. In the SIMetrix, how should I ...
EEC's user avatar
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3 answers
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Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer

I was reading through the datasheet of a boost converter, TPS61023 from TI. In the "Input Capacitor Selection section", they give the following advice: Notably, TI advises against using ...
Mu3's user avatar
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8 pin SMPS controller chip

I have a 12v 10amp SMPS unit, the main controller ic was damaged and broke apart on removal - hence no markings retrievable. Is there any way to narrow down to possible matches of the controller chip ...
Sundeep Goel's user avatar
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Help in identifying SMD SMPS driver chip

please help in identifying this chip (use in 12v 5a SMPS board for a driver LED)
Sundeep Goel's user avatar
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Average Model of Buck Converter

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage https://powersimtof.com/Spice.htm, from ...
Power Path's user avatar
2 votes
2 answers
195 views

Calculating junction-to-ambient temperature rise for switching MOSFET

So I'm looking at datasheet's since I'm looking for a N-Channel MOSFET for a DC-DC Buck Converter that will be switching at 1.2MHz. Since the MOSFET will be used as a switch for the Buck Converter, I ...
J. Street's user avatar
-1 votes
1 answer
77 views

Butterworth Filter for SMPS

If the performance of a Butterworth filter is dependent on the load impedance how do high voltage high power 1kW+ SMPSs manage to achieve smooth output ~100mV peak to peak across wide ranges of load ...
beardeadclown's user avatar
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Middlebrook Stability Criteria for Input Filter

I am trying to apply Middlebrook input filter stability criteria for Active clamp forward converter .So for finding Input filter output impedance over the frequency range is quite straight forward in ...
Power Path's user avatar
1 vote
1 answer
49 views

Closed Loop Buck-Boost converter, no load condition

My question is how can I close the loop with no load condition of my buck-boost converter, by using peak limiting current mode control? Is the bleeder resistor needed or is it possible just to close ...
usernamenenad's user avatar
1 vote
1 answer
49 views

Average Model of Peak Current Mode Buck Converter

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage, from file “PWM Switch LTspice: Mark ...
Power Path's user avatar
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How should I come up with a power supply for 5 motors, one micro-controller (ESP32) and one microprocessor (Jetson Nano) for an object sorting arm

I am trying to design a power supply for a robotic arm with 5 servo motors(2 are MG90S and 3 1501MG motors). I'm planning to use an ESP32 microcontroller and Jetson Nano. I have the option of using ...
Baraka Seth's user avatar
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Switching between two power sources and charging a battery pack

I am designing a circuit, which can use either the power from the normal socket (230V) to charge a battery pack and power a arduno uno R3 at the same time when a spst switch is on. When the switch is ...
Mario Gabriel Radu's user avatar
1 vote
2 answers
77 views

Would thermal vias under an Inductor be effective at dissipating heat?

I'm designing a BMS board that will be capable of charging my 1S2P battery back. I'll be using the 21700 Li-Ion cells, which will mean my batter pack will have a total capacity of 10000 mAh. The ...
J. Street's user avatar
1 vote
2 answers
43 views

Modeling current limited Error Amplifier Output of UCC28C51?

I am designing a current mode flyback, and am using the UCC28C51 IC from Texas Instruments. I don't intend on using the error amplifier built into the chip, I intend on having the optocoupler ...
Michael Beckwith's user avatar
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1 answer
59 views

Peak Current Mode Control Buck Converter Slope Compensation Info From datasheet

I am working on Buck Converter design based on LT8642S controller and trying to do average modelling ,so I contacted manufacturer regarding slope compensation info and they responded below. "The ...
Power Path's user avatar
0 votes
1 answer
99 views

Buck Converter Peak Current Mode Control Average Model

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below snapshot taken from Christophe Basso Webpage(https://powersimtof.com/Spice.htm) from file "...
Power Path's user avatar
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1 answer
86 views

LLC Half Bridge, Magnetic components testing and implementing problem

In my power supply design I am tested switching operations of half bridge circuit with open circuit and observed clear 155, -155 square wave I want to test step by step so for next step I want to ...
MSB's user avatar
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In a flyback, why does the Vin supply hit overcurrent protection mode if the PWM controller bias is turned on before it? [closed]

I am working with a DC-DC flyback converter with 60-325V Vin and 60V Vout. I'm using UCC2813-0 by TI as the PWM controller in the primary side. While powering on the flyback, I have to supply Vin ...
moony's user avatar
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1 vote
1 answer
69 views

Why do the number of valleys change when load is changed? [closed]

I am operating a flyback converter with 60V DC input and 6V DC output. The load connected across the output is 500mA. My mode of operation is DCM. If I have 4 valleys in the magnetizing ringing of Vds ...
moony's user avatar
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1 answer
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Power Supply is arced and fuses opened

Note: PFC circuit is bypassed I have my own designed circuit and this circuit is get input of 220VAC/50Hz. Inside of circuit bridge rectifier and filters are exist with this circuit we get 320VDC. So ...
MSB's user avatar
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-1 votes
1 answer
45 views

What would happen if I connect a AC input to a DC-DC flyback converter without any rectifier? [closed]

I have a DC-DC flyback which has a 47uF, 450V bypass capacitor at the input. What would happen if I connect a 220 V AC supply at the input instead of DC? Will the bypass capacitor blow off, or will I ...
moony's user avatar
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Current sensing in DC-DC converter

I studied DC-DC converter in peak/valley/average mode control and I have a question about the methodology to sense the current in average current mode control. I saw lot of paper about DCR sensing but ...
AnalogMan's user avatar
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1 answer
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How does a circuit with dual charging ports actually work?

I have a tablet for which I replaced the charging connector from micro USB to USB-C using a PCB module with a USB-C connector. Since there was no space on the PCB to mount the new connector, I had to ...
condor12's user avatar
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Boost converter compensation RC network

I am using the TPS61175 as a boost converter, outputting 15V from a 6V, 0.8A input. According to the datasheet, component values and layout are detailed, but I cannot find any useful information on ...
lemon's user avatar
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0 votes
1 answer
41 views

How to calculate Rslope for MAX25611

There isn't much information for calculating Rslope. THe only equation that includes Rslope is Vslope, which is being differentiated. Unsure how to approach this, as I seem to require it for my ...
roaibrain's user avatar
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1 vote
2 answers
71 views

Is there a standardized process for Inductor selection calculation for boost LED controllers?

Through numerous datasheets that I've gone through in selecting an LED controller to use, I've come across two different methods that are used to estimate the needed inductance: Based on the ripple ...
roaibrain's user avatar
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1 answer
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FDC6333C N & P−Channel MOSFETs on waveshare ESP32-S3

I'm stumbled upon the schematic diagram from waveshare ESP32-S3-PICO and doesn't understand much on the so called "Save power" circuit diagram. From the picture, the connection from VUSB and ...
Kenny Thum's user avatar
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1 answer
71 views

Do all SMPS ICs have an internal dead-time for the MOSFETs, specifically the LTC7878?

I am trying to improve myself in power electronics and currently trying to build a Buck-Boost converter. I chose LTC7878 for this purpose since it meets my requirements. My issue is that while I am ...
OpenBrainedProf.'s user avatar
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1 answer
69 views

SMPS diode identification

It's marked T2D46 with a bar over the 46. It tests open both ways on a DMM diode test. I can't locate this with all of my google-fu powers or Octopart etc. EDIT: I've included a picture of the board ...
Roberto's user avatar
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2 answers
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NCP11187 - SMPS Design Issues

I have been working on a SMPS design using the NCP11187. It should output 24V DC nominal with a maximum ripple of no more than 100mV Pk-PK and be able to output up to 50 Watts. I have generally ...
Folgar's user avatar
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3 votes
2 answers
1k views

Best way to drive multiple LED strips at distinct times with one LED driver

Application: 6 LED strips: each strip has LEDs connected in series Driver is TPS92691 (CC LED driver) The source is a battery The LED strips will be flashed in a carefully controlled cycle, starting ...
roaibrain's user avatar
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1 answer
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SMPS transformer operation and replacement questions

I'm attempting to repair an SMPS for an old iMac. I've traced voltage up to this transformer. There are 4 leads on the primary side with 1 snipped off. The PCB has pads for only 3 leads on the ...
Roberto's user avatar
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2 votes
1 answer
114 views

Switch Mode Power Supply Stability Analysis for Cascaded Converters / Filters, Loading Conditions

When putting switch mode supplies in series with each other, or adding an input filter to a supply, I have used the Middlebrook criteria to check for stability. Chris Basso's other stack exchange ...
ardarn's user avatar
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0 answers
35 views

What is the purpose of this transistor? [duplicate]

I would like to Know the purpose of this transistor. Someone knows the name of the circuit topology??
A. V.'s user avatar
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1 answer
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Analysis for the peaks in FFT

Suppose I have 2 cases: 1st MOSFET switches with rise times and fall times of around 10ns (Vds). 2nd MOSFET switches with rise times and fall times of around 50ns (Vds). Both of them have a switching ...
Andr7's user avatar
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1 vote
1 answer
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What conditions create subharmonic oscillations in switching converters?

I have been thinking that any time you're in CCM with a duty cycle greater than 50%, you can enter subharmonic oscillations. Is this only for current mode control, or is it voltage mode as well?
Michael Beckwith's user avatar

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