flyback

Hi, I purchased a couple of the ubiquitous "electric arc lighter" devices off of Amazon because I was curious how the designers were able to pack a 3.7v to many kV step-up circuit in a package the size of a ballpoint pen. I tested out the device and indeed it is able to make a ~4 mm sustained...

Hi, I have been reading a lot about flyback driver circuits for generating high voltages. Tutorials on Youtube are a dime a dozen describing minimalist circuits to drive automotive ignition coils and similar. However these tutorials rarely describe the underlying design theory and considerations...

Hello, We have used a flyback switcher UCC28910DR from TI in our board but unfortunately, the lead time for his part is now 63 weeks. Anyone can suggest an alternative? I really want to avoid board redesign. Cheers

Hi, I have a crt monitor that dosent work now, I figured out that a mosfet was running very hot and was shorting the smps(making it stop and restart), I removed it and saw that theres no short circuit now and the led/buttons works but theres no picture, it's the mosfet that generates the B+...

I've been looking at UCC28C43 models provided by TI. Why do we need two different Spice models such as "Transient steady-state" & "transient start-up" for MOSFET driver IC? How do we use them? When do we need these analyses? Do all microcontrollers in power electronics have such separate models...

Hello, Can someone please explain how to know which pins are for the primary coil, the flyback coil and the HV ground. I have measured the resistance between all the pins and get either 1.5 or 0.5 ohms and nothing in between. Also, using the method where a 24v supply is connected, I was...

Hi everyone I am tryig to obtain the gain and frequency plots of a flyback converter controlled with LT8316. LTspice does not provide any frequency response feature but I use middlebrook's method to obtain frequency response. However, result is too weird :( I simply insert a small ac signal...

Hello everyone, I'm trying to create a high voltage power supply with a flyback transformer, IRFZ44N and a 220 Ohm resistor. (200 ohm in the diagram should be 220 Ohm ) Here's my schematic. My problem is that the wires connected to drain and source of the mosfet becomes burning hot and melt the...

Hello all, I am designing a 12V, 18W Flyback SMPS and i can't figure exactly the characteristics of high-freq transformer (Both Core, Bobbin) to send for transformer manufacturer!! Can someone already went through these procedures guide me little bit!? Regards,

I'm working on building an electric scooter and yesterday the speed controller had a MOSFET failure that I suspect was caused by inductive spiking. This was very surprising to me because I had a schottky diode in parallel with the motor to prevent this type of failure. I took the speed...

Hi, everyone. I'm building a 110VAC-12VDC 120W Flyback converter using UC3842, and have some problems with the start-up circuit and output PWM signal. In the beginning, the design spec at first: Input: 110VAC Output:12VDC 10A Switching frequency: 107kHz Transformer core: PQ35/35 (unknown...

I have been studying the use of snubber circuits within flyback converters and other hard-switched converters, and doing some simulations to see the results. I have came across one type of snubber called a passive snubber circuit, which uses no resistor and instead some additional passive...

Hi. I am trying to build a power supply which output is 2000VDC and 20mA (40W) input is 220V ac (european input). I thought I can use flyback transformer. And I started to design. I selected duty cycle as %50 and frequency as 50kHz (actually I don't know how to select frequency and duty cycle...