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66 Threads found on edaboard.com: Isolated Flyback
I think I would take two bites at this particular problem. First I would build a non isolated boost converter to convert the incoming 9v to 36v up to something just slightly above 36v. Then I would build a full bridge that always runs at full maximum duty cycle through a transformer to generate the isolated 18 volts.
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
The high frequency transformer I have on which is written :EI-28ASG,01N,LIV 0454 was extracted from a computer power supply,can you please guide me on how I can get the 15VDC? Are you trying to build a 6 to 15 V isolated DC/DC converter or an AC/DC power supply, as assumed by the previous posters? Regarding the recycled transform
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?
Hi, Please check with your gnd of ic, the primary gnd and secondary gnd should be isolated! Bill Lee
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
hello guys i want to use a mosfet as a high side switch ( instead of a relay) there is no fast switching (of duty cycle) just 0 or 1 , just ON/OFF each couple of seconds . to turn on the high side mosfet , you need about 12-15v between gate and source . but i am using a micro-controller or a key button (digital pin NO PWM), so i need a
I want to make a Push Pull type DC-DC converter with multiple outputs for driving the gates of an inverter and also some control circuits. While bootstrap method is popular, it has it's limitations. All the people at our college use a large no of isolated power supplies to do this and I want to make the Power supply part compact and cheap. I am th
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
The topology designated "buck-boost" in the RT7302 datasheet isn't but an non-isolated flyback. It saves some transformer copper but the primary waveforms are essentially the same as with regular isolated flyback. It reduces the "huge voltage stress on the power switch" only in so far that additional overvoltage caused by (...)
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?
Hello all ; Let me explain my question simple I designed 3 phase bldc motor driver. I have 48V (Max 55V) Lithium-ion based battery. I need 12V-2A and 5V-0.5 A(maybe lower) two DC output. 12V to feed my gate drivers(TLP250(6)) and 5V to feed my microcontroller. 12V output should share common ground with 48V battery but 5V must be seperate isolat
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.
Hi I want to build an isolated power supply. Input will be 12v DC and output is 12V and 9V but isolated. How to do that? If smps is used, which switcher should be used?. I don't have any experience with SMPS and power supply, however want to build one as soon as possible. Can anybody please guide.
If transformer is fine, then there may be problem with the feedback circuit. I mean you can check by giving 3.3V from outside to your viper switch and check for 3.3V output if its coming correct and this will verify if everything including transformer and your switching of mosfet, is fine and then compare giving your actual
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