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66 Threads found on Flyback Isolated
72W, 1:4 input voltage range sounds like being basically suited for a flyback converter.
Need help. Need to design a dc/dc isolated voltage regulator. Vin 60-160 v Vout 5V Io=0A - 5A Efficiency more than 83 %. The design should fit in 110x58x26 mm volume (aluminum box) I started (draft design on paper) with flyback DCM topology. 1) ICE3BR0665J controller, 65 kHz, 0.65Ohm RDSon 2) VS-48CTQ060PbF output Schotky diode
Using a flyback converter with small transformer will give much better efficiency than a single inductor buck converter, whether you want an isolated design or not. Because the switched power of a buck converter is input current * output current, resulting in respective switching losses. A Vin/Vout ratio above 20 isn't suitable for a buck converter
Hello, i have recently designed a 7V to 200V DC-DC SMPS converter, using LT3757. The output current is in the 1-10mA range. I use a DA2032 from coilcraft with a 1:10 ratio. At steady state, i get peak currents of 1.5A at the primary. My controller supports only non-isolated flyback, due to the nature of the resistive divider from the output. I a
Hello,I would like to design a flyback converter with TL494 could anyone suggest the circuit and operation I have 6V which I want to make it 15VDC for supplying the control circuit of my VFD for AC 3phase motors. The high frequency transformer I have on which is written :EI-28ASG,01N,LIV 0454 was extracted from a computer power supply,can you pl
Yes just use a flyback or two transistor forward to get the isolated 11.5V, 3.5A. Stick with a separate buck for your other output whatever that is? Alternatively use a single flyback with two isolated outputs to give you each output. I wasn't sure what your actual vin was?
Without a load, high flyback Vce can easily kill the transistor. The snubber is only good to absorb the leakage inductance energy, not the full flyback energy. The other point is that the 1K base resistor value will put the transistor into linear operation with huge losses. I don't know which test is intended with this circuit, but it should con
You mean your fet on times are sometimes very long or short? Anyway, a good way is just to do a little flyback type high side isolated supply and reference it to the bridge node?in a full bridge do one for each side of the bridge. Don?t put a y cap between pri and sec as it will just conduct huge pulse currents. Put a third winding on the flybac
hi, i have just finished a 20 watt fly-back converter with wide input range 130 to 700 DC input by following application note. Is it possible to add a small micro controller at the output side (which is isolated) to adjust the output voltage by using up down buttons or by using commands
What's your problem with the circuit, it's rather straightforward. 1. A self-oscillating flyback converter 2. A transistor to speed up switch-off operation The diode in parallel to the transistor is a zener (e.g. 12 V) that keeps the gate voltage constant over input voltage variations. From the options listed by xenos I would prefer the pho
Usually a flyback is employed for these types of aux power supplies...., but a fixed push pull can work, you need to avoid the chokes in the o/p rectifying ckts...
Hello, We are doing a 60W isolated offline flyback (120W peak). We are using an ETD44 ferrite core with 1mm gap. The transformer winding company say that they cannot glue the ETD44 ferrite core halves together because it is not a robust method of adhesion. Is this true? They tell us that they must instead use the core clips to hold the core ha
I am considering to use Buck-Boost topology for Power Factor Correction but I'm having trouble finding much literature on it. My appliance is an LED fixture so it will always have a (fairly) constant load (150mA @ 30V). Since the input voltage range is going to be between 100-240 VAC and the output is 30V, using a Boost Converter with PFC is a bit
Hello, We wish to scope the voltage across the output diode in our offline , isolated flyback SMPS. (to see how high the ringing voltage goes) Should we use a differential probe, or will it be accurate enough to simply connect the actual scope probe directly?
Unregulated DC/DC converters (fixed voltage ratio) are usually made as forward converters. If your converter also implements voltage regulation, flyback can do this without additional energy storage inductors. The title is misleading because the problem hasn't to do with motor controller function. Rather "converter for isolated mcu supply".
Hello all. I am working on a microcontroller based flyback converter. Since the flyback converter is an isolated DC-DC Converter, it is using an opto-isolator as a feedback element. Attached with this post is an image from a Texas Instruments Application Report of a TL494 based multiple output flyback converter. (...)
Presumably you need an isolated output? A flyback will do it for you, we have designed a number of these types, easy at the power levels you require.
Well there are off the shelf power modules that fit your specifications, but they are a lot more expensive than a DIY circuit. A multi output flyback would be the simplest solution, if cross regulation is not a big problem.
Hello everyone! I am at prototype stage of making power supply like in title. The problem is my output is 10 times smaller than it was expected to be - i have 0,33 V instead of 3,3 V . I have no clue what could be wrong, circut on the board is ok, transformer also seems to be ok. Any suggestions will be checked instantly, thanks for any response
Hello, This product does not have the regulatory 8mm of isolation spacing from the mains side to the LED time 20:52 of the following, appears to be the proof that this mains light bulb not isolated.... Therefore, is it ok if i do a 15W flyback with bifilar wound enamelled copper