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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Wiring a eTopxizu 12v 30a Dc Switching Power Supply to USA 240 volt plug?

I have a eTopxizu 12v 30a DC Universal Regulated Switching Power Supply. The power inputs are marked Ground-Neutral-Load. It has a switch on the side that adjusts it from 110 volts to 220. When I ...
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15 views

switching power supply causes DC motor to bounce

I am attempting to operate a 12 volt 6 amp average current DC gear motor with a Mean Well DRP-480-24 switching regulator power supply. When I connect it to a motor driver the output cannot operate ...
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39 views

Identify ic from 24v smps

Pls help me identify the ic used in a 24v smps. It has marking IFA=W03, 6 pin DIP, plastic package.
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1answer
25 views

Where can I get knowledge on transient mode boost converter for SMPS?

I am working on boost converters for switching mode power supply . How can I get knowledge on transient mode boost converter ? As I know there are different topologies named CCM , DCM and TM which ...
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5answers
89 views

Switching power supply only works when warm

Update With the multimeter and a steady hand, I've found the 3843B PWM controller Vcc pin is 12V when the supply is on, and 8.2V when it is plugged in but cold. Datasheet says it needs 8.4V Vcc to ...
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39 views

problem with zvs full bridge

I am designing a DC/DC converter. I chose the fullbridge topology. The requirements are as follows: Vin = 75 - 125 Vdc Vout = 200V P = 600W Fs = 100 Khz the basic schematic is as follows I use ZVS ...
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1answer
54 views

Controlling high voltage PWM [closed]

I want to use Arduino(or others) digital pins with PWM to get below outputs. Voltage 0-50V, Pulse amplitude: 0-100mA, Pulse width: 0-200us, Frequency: 0-1kHz I need your help and suggestions for ...
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37 views

Function Transfert Closed Loop PI regulation

i have a transfer function and i need to calculate the PI coefficient in closed Loop Transfer function H(s) = -3.766/(1+ 3.766*10^-3 s) PI transfer function ...
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0answers
18 views

Best PWM IC for LED Driver [closed]

I am confused to choose best PWM IC for my LED bulb Driver (Offline flyback SMPS converter with primary sensing) Specification- Input-90v to 265v AC Output- 150mA constant current, 40V DC Please ...
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1answer
42 views

SMPS buck convrter with PWM controller circuit

Hi there I am designing a buck converter run on PWM circuitry for a uni project to drive a MOSFET switch and keep my output voltage constant. The specs are: input voltage of 20v DC +/- 4 output ...
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3answers
67 views

N-Mosfet switch circuit strange behavior laboratory power supply

I'm dealing with an N-Mosfet switch circuit to control, through PWM, the temperature of a heater resistor. The mosfet is a IRFS7430-7PPBF. The load is driven at 12V and has a power rating of 80W. ...
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1answer
37 views

Inductor's self-resonant frequency: Do we want it to be high or low?

Inductor selection always confuses me. There is a spec for inductors as self-resonant frequency. For example, on digikey, as SR frequency of inductors increase, the price may increase or decrease. But ...
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2answers
51 views

Grounding dc project to clean RF noise

I'm doing a home automation arduino / RFID project and using a 12v DC switch mode power supply to power it. This supply will be plugged in to a wall outlet. The project however will have some ...
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0answers
16 views

What's the peak voltage of the sawtooth generated by the ic SG3525 or UC3525? Does it depend on the Ct capacitor?

P.S. I need this information in order to make a closed-loop FlyBack CC-CC converter. The Tm transfer function is related to the sawtooth peak voltage: Thanks!
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25 views

Decreasing Voltage of Power Supply Laptop Charger to Solve Another Issue: RIght or Wrong?

I have recently bought a laptop universal charger, and as soon as I plugged it in, the mousepad of the laptop started lagging. The Power Supply Charger is registered as 70W. The laptop requires 65W. ...
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1answer
72 views

How come SMPS regulators doesn't show current limiting circuit?

for example the LM2678-ADJ is a famous buck converter, there are also many others. I have googled and looked through other regulators, there are many schematics in the datasheets of how you make the ...
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0answers
28 views

Can I put two identical switch-mode power supplies in series to use a higher input voltage?

I have two identical switch-mode power supplies that are rated for a maximum input voltage of approximately 22V. I have a 36V battery that I want to power these from. I was wondering that if I put ...
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24 views

LNK304 noise comes when using it's output

I've built a power converter with LNK304 for 230VAC to 5VDC. The schematic I've used is in the datasheet: http://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf at page 4, figure 5. First of all, ...
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2answers
77 views

Can a SMPS LED driver glow 6 Watt LED bulb and same Driver is able to glow 0.5 Watt LED?

LED : 150mA * 3.3v =0.5 Watt 6 Watt LED (0.5 Watt* 12) : Which one is best method to arrange LEDs Parallel or Series. At a time only one LED will glow, Either 6 watt LED or 0.5 Watt LED. ...
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2answers
75 views

Reduce noise in Buck converter:

I'm making a buck converter, this is the circuit I've: The average voltage at the output is ok, but I'm getting lot of noise at all nodes of the circuit: I'm using as a main source a 30V 5A bench ...
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58 views

How does an SMPS initialize?

This may sound a nonsense question for some of you but I was trying to visualize how an SMPS initializes. Below is a block-diagram taken from a particular SMPS datasheet: ...
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4answers
118 views

How is galvanic isolation established in an SMPS?

I can understand how an isolation transformer can establish isolation; but since SOME SMPS supplies dont have transformers and they have rectifiers instead; I wonder how the AC and DC ends are ...
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1answer
958 views

Unusual chemical reaction on PCB (SMPS circuit)

I have a PCB with smps circuit on it 220V to 5V (using Viper22a). Here is the schematic: And here is the board layout: In the yellow circle region, I am seeing some sort of white deposition in a ...
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31 views

Firing of mosfets

I am designing a converter topology for that i need to mosfets.The switching frequency is 200KHz. Both the mosfets need to be fired one without a delay and other with a delay of 0.2 micro seconds. The ...
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1answer
25 views

Limit the current of a fixed voltage via MOSFET+PWM

I have a SMPS which I would like to current limit. The current limiter should have a negligible voltage drop when not limiting (say, <0.5%). I thought of inserting a MOSFET and a hall-effect ...
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2answers
63 views

How to control output voltage on a Buck Converter

I'm fairly new to electronics and I have copied the Buck Converter (LM2678) in the picture attached to convert 24V to 5V. After trying it I have actually converted 24V to 9V and my question is if I ...
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1answer
31 views

Synchronous Buck Converter loop function

I have been reading the data of this Buck converter model, but on the block diagram scheme. I don't understand what does the indicated feedback loop do. The buck Convert model is LM5165-Q1 and this ...
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2answers
51 views

TI TPS57160-Q1 step-down converter outputs sawtooth-like voltage at high input voltages

Disclaimer: I have posted this question on Texas Instruments' E2E Community before (Here), but haven't found a solution to my problem yet. In the meantime, I haven't found any way to progress on this ...
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1answer
36 views

Does current flow through the potentiometers of buck and boost converters?

I'm working on a project where I'm replacing the trimpots on a buck converter and a boost converter with proper potentiometers. The new potentiometers will be wired to the converters instead of ...
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1answer
34 views

power factor correction and switched power supply efficiency

When it comes to switched power supplies, is the power supply efficiency affected by the presence of a power factor correction circuit? In my understanding power supply efficiency is estimated by ...
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2answers
27 views

Current drawn from source by buck reg

simulate this circuit – Schematic created using CircuitLab The circuit above is that of a buck regulator that has an efficiency of approx 85%. The input and output voltages are 10V and ...
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35 views

Switch off idle AC/DC converter?

I am using a 5V/1A power supply in my circuit. Unfortunately, the load is not uniform, so the power supply idles a lot during operation. And the power supply makes a unpleasant buzzing noise when ...
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1answer
50 views

LMR10510 - Simple switcher “breakoutboard” output measures 0V

I have a problem concerning this Simple Switcher found here. I used the design example 3 for the LMR10510Y found on page 17 of the datasheet, however measuring the output pins of the switcher returns ...
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1answer
28 views

Powering multiple DC gadget(Routers, switches, RPis etc) using a single smps will be efficient than multiple power supply?

I have multiple DC gadgets (Routers, switches, RPis etc) so obviously multiple DC adapters too. I have two spare ATX SMPS. So I was thinking to modify one SMPS so that I can replace all those adapters ...
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2answers
85 views

why Boost converter output voltage decreases at high power?

I am implementing non-isolated Boost Converter, capable of handling a power of 1Kw and output voltage is to be maintained at 400V at an input voltage of 120V . At smaller load current (around 2.5 Amp ...
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1answer
136 views

Induction cooker - highly irregular power transfer curve

I’ve designed a Class D series resonant inverter, for use in an induction cooking application, which is displaying a strange behavior in its measured current vs frequency curve. The topology, ...
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0answers
22 views

power switch on off delay

I am looking at how I could create a power switch using a key button by pressing 2 or 3 seconds on it to power on and power off our circuit which contain a BQ25120 and a CC1310. I suppose I would need ...
0
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1answer
47 views

buck regulator MOSFET turning off for a short duratiopn

I am designing a regulator system using a buck regulalator. The datasheet is - datasheet. Now, the regulator can be configured to switch at 100-500kHz, and this is done using a resistor connected to ...
0
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1answer
58 views

Switching power supply noise and grounding

So I have a +-15 V and a neutral switching power supply. As far as I can see the outputs are floating. The power supply has no earth connection. Voltage from negative terminal to neutral and to ...
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1answer
34 views

SMPS Transformer Primary Inductance

When Designing SMPS we calculate all the parameter on minimum DC bus voltage (eg 85Vac*1.414=100VDC), and we get require inductance for primary winding is Lp (eg 0.97mH). But in real we run on Normal ...
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0answers
31 views

Spoofed solar grid-tied system load management

Thanks for having me in your midst. I am new at this site. The situation I am designing for is thus: My 5 kW solar array has a micro inverter on each panel. When feeding into the grid, the ...
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2answers
167 views

Why do people hand wind flyback transformers?

I'm intending on building this circuit, but re-specified for an output of about 150V @ 5mA. Enough to light two neon bulbs from a 12V supply. Why do flyback transformers such as the Wuther's seem ...
4
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1answer
167 views

SMPS Buck converter with PWM circuit

I am designing a buck converter with PWM circuitry for a school project to drive a MOSFET switch to keep my output voltage constant. The specs are: input voltage of 20v DC +/- 4 output voltage of 5v ...
0
votes
1answer
50 views

Advice on Buck-Boost Stage

In one of my circuit, the incoming variable voltage(8.5-24V DC) from the source will be first stepped up to 17V using a boost converter. The same output shall then be stepped down to different ...
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1answer
48 views

2 psu conected as split + and -

I have 2 pcs 24VDC 3Amp ITE adaptor and i want to make split supply for 24v +/- 1 of the adaptor i remove the earth wire on the wall plug 3 pin and 1 is connected with earth.Adaptor A conected with ...
4
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1answer
72 views

Loop compensation design of buck converter

I am trying to design loop compensation with type-3 error amplifier for a buck converter. I'm a student and very inexperienced in this subject. Please bear with me. Here is the general procedure ...
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17 views

Wide range SMPS

I Need to design a SMPS with (input single phase voltage 300VAC to 525VAC, single op 15V , power 10W, best effieiecny, UL approved, as compact as possible), I use the poweresim tool for reference ...
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1answer
127 views

Switching regulator enable pin low, but output isn't fully off. Why?

I'm working on a battery-powered application using two Texas Instruments switching regulators and a Linear Technology pushbutton power controller: I have confirmed that when I push the button and ...
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1answer
81 views

How to calculate the feedback resistors for an SMPS

I have designed an SMPS circuit for my host board. As the datasheet, the feedback resistors are calculated as As per the datasheet, Feedback Voltage(Vref) is 0.6V and I want 4V Output Voltage. ...
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2answers
40 views

efficiency calculation of dc-dc converter

I am designing a flyback converter circuit using the LT8302 flyback converter IC. Now, the efficiency of this chip is approx 85% as shown from the datasheet and the screenshot - The value of 85% ...