switch-mode-power-supply's questions - English 1answer

1.264 switch-mode-power-supply questions.

Basically, I have a high drain battery at 3.7v and I want the output power to be controllable. The circuit I have designed so far is a boost DC-DC converter using a 555 timer to control the switching ...

What actually determines the current drawn by phone battery? Is it the phone battery (load) or the charger (supply)? For instance, the charger that came with my phone reads 1.5 A. Also, I have two ...

Am troubleshooting the failed SMPS.have checked the healthiness of MOSFET and it is ok.And also replaced the failed capacitor.In transformer primary side voltage is there.But in secondary side there s ...

I'm using following circuit for a boost converter using MC34063A IC. The circuit is designed for 24 V, 250 mA output. The simulation works fine but the actual circuit on a PCB behaves weirdly. In ...

I tried to build a circuit as in picture below, where the LDO+MCU contains an Atmega328P, powered with an LDO: In D3 cathode, there is a main rail supply, which can be up to 20V feeding the LDO and ...

How to assess the healthiness of Smps transformer through multimeter

I found a TI reference design, which is class 4 PoE with 25W output power. I looked at the schematic and made some calculations: I looked up the transformer turns ratio, which is P:S = 1 : 0.16 (...

I'm trying to design and build a simple ac/dc smps that outputs 5v dc and capable of 2 amps. I currently have it mostly designed using a nmos but the problem I'm running into now is how to get a pwm ...

Considering buck convertor for charging of Lipo/Li ion batteries would be a good idea? As TP4056 based design has some issues while used with a 9 W mono-crystalline solar panel for charging a 3.7 V, ...

I want to drive a 180V/1A string leds from 220VAC. Which topology should I use: flyback smps (with transformer) or, floating buck step down converter? I know that buck converter will be not ...

I was evaluating PAM2316 DC/DC step-down converter and destroyed several of them, I suppose the cause could be an inductive load. See my schematic and my layout here: Let me explain: The circuit was ...

I am troubleshooting a SMPS of a Lenovo notebook (65 W). It just stopped charging during operation. When I test with a multimeter, there is no voltage detected, so I assume it's the SMPS and not the ...

Need power redundancy with multiple power supply to a ATX mother board. i am thinking to for a parallel connection from both SMPS output and connect to motherboard. will it create any problem? Is ...

I am trying to repair a switched-mode power supply, but as of now I have no success. The problem can be described as following: The supply does not output any voltage whatsoever. The fuse never ...

I need to simulate inrush current of SMPS with power factor correction. I hope that it is possible to put rectifier bridge, capacitor and, probably several additional components, to simulate the ...

Today I heard a loud bang that tripped the circuit breaker in my server room. It must have been really loud because I could hear it 2 rooms away through 2 heavy doors and it was like a firecracker ...

I'm looking at using a Meanwell IRM-03 isolated switchmode power supply (datasheet) in a project but the active/neutral pins are arranged in an inconvenient way for the PCB tracks. It would be a heap ...

Friends have a simple circuit a switch on off using triac BTA24600B, The strange fact is that when I turn off my led lamp keeps flashing fast, this is not the case with other types of lamps, only with ...

I'm using a 12V adapter and a 2S 7.4V Li-ion battery to power my electronics, and I would also like to power my MCU with it. To switch between the adapter and battery I'm using a BQ24133 from TI. I ...

I'm a little bit confused about this matter. I've got a switching-mode battery charger (basically, a power supply) based on the LT3650. I want to know how much the inductor temperature is going to ...

I'm trying to build a boost converter with the following specifications. Switching Frequency: 100 kHz Maximum Input Voltage: 14 V Nominal Input Voltage: 12 V Cutoff Input voltage: 10.5 V Power ...

I want to run 10 motors, each motor has specification of max 70 V and max current 160 amps. My doubt is, is it possible to build SMPS for these purpose. If not what would be the best alternative. I ...

In many SMPS application (BOOST converter in particular), power MOSFET is used as a switch and it is driven by a PWM/IC at a frequency in a range of hundreds kHz (f = 200kHz for instance). This means ...

I'm building a SMPS and I would like to have a current limiting feature on the output. I'm trying to make a feedback loop using TL431, shunt resistor, optocoupler and a potentiometer, but no luck this ...

When I take a look into most PC power supplyie (also some high power ones=800W) I don't really see transformers which seem big enough to handle the required power. Looking around the internet, a ...

I'm reading up on how SMPS's work, and all the videos says that after the high-voltage chopping stage, a smaller transformer can now be used, because of this high frequency. My question is, how does ...

I'm trying to design a auto voltage selector circuit to prioritise USB voltage when the USB is plugged in. The power goes through some voltage regulators which then powers a MCU (ATMEGA32U). I have ...

I am Designing a Buck Converter with 5 volts , 300ma output in CV Mode using LinkSwitch-TN2. I am unable to calculate the values of R4 , R5 and C6 shown in below diagram for 5 volts. 1.If current at ...

I need help with identify smd transistor with marking "651" in probably package sot-89. I am 99% sure it's pnp transistor because I measure it by my "transistor tester" and also as I drew schematics ...

There are many articles on the internet about life expectancy of switching power supplies, but most of them have discussed about the situations that the PSU is at near full load. I'm designing an ...

I'm following standard design recommendations for a IRS2153(1) half bridge driver in the following setup: The problem is that the output (measured at the joining net of Q1, Q2, L1, pin 6 and C3 ...

In the following SMPS circuit I was wondering what is the type of filter at the input (marked in red). It's neither pi or t type as far as i can tell.

I am designing a low noise SMPS like this http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf switching from 40-90 kHz. I have a weird problem, on the output we are seeing a spike of noise at 5.5 kHz and ...

Edit: Added gating signal waveforms. Changed some of the graphs, I accidentally put a test circuit waveforms the first time. Current is not that high but offset is there and current is high for a ...

my turbo charger burned out.in the circuit, the smps ic's VCC connected to 230VAC using start up series resistor and also to aux winding power. My question is, will the smps ic work if it is powered ...

I'm building an SMPS in flyback topology. In order to do it, I use UC3845CB IC. In first step, I wanted to see if it even works at all with pulse transformer that I bought, made especially for flyback ...

I have a 4S battery pack which is attached to a BMS. To get a 12V output for a LED driver, I have attached a buck/boost module at the BMS output pads. But after a while when the buck/boost is powered, ...

I have a few SMPSs with over current protection. When reaching the maximum power output they simply start dropping the voltage. I am powering LEDs and the alternative would be to add a small ...

I am trying to simulate boost converter using voltage-mode controller as the schematic below. However, the circuit doesn't work as expected. Output voltage is supposed to be equal to reference voltage ...

I am using a NXP (freescale) 33883 H-Bridge gate driver IC to drive a simple H4 bridge circuit which is connected identically to that in the application schematic in the datasheet: I am switching at ...

Let's say you have a device which is fed by AC line voltage and features an isolated SMPS. The switcher outputs 5 VDC, and that powers a PIC micro. I'm curious how is the Microchip's ZCD (Zero cross ...

At the time of my plc system inspection i found that my smps input is correctly connected with 230v ac supply but when i check the output + and - voltage with respect to ground i found in both ...

I made a prototype of multisensor circuit with temperature, humidity, PIR, etc using a ESP8266. My idea is to put each of this module in each house room. To achieve this and I want to put the entire ...

I am operating the buck converter with STmicroelectronics VIPER01 IC to step down the input voltage of 200 volts to 6 volts in continous current mode 300 mA load current. The operating frequency is ...

I'm currently modifying this buck/boost evaluation board to output a range of voltages between ~1.5 V and 12 V. In order to achieve this, I've replaced R14 in the feedback voltage divider with a 20 ...

Hello All , In the Above circuit , TL431 is used to regulate the output voltage which is set by resistors RH1 and RL1. resistor RB is bias resistor to provide the current to regulate the output ...

I have an old switching power supply for HP 712/60 workstation (+5V, +3V3, +12v). It was working about ten years ago when i've last tried to boot the system, but now one of the output voltages is at ...

I am designing a flyback converter in Matlab Simulink but I don't know how to calculate the values of the capacitor and resistor used in flyback converter. Can anyone please help me with that?

I've couple of questions regarding the buck converter. I've been trying to design a buck converter for MPPT circuit which is in Low side switching configuration, as shown in the below diagram. ...

I removed all unnessesary cables from some old 200W PSU and added connectors, so I can use it as Power supply. But there is problem :D When I turn PSU on (this is one without green start wire) I ...

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