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I'm looking to use an atmel attiny uC to make a simple yet efficient (85%) and SMALL buck/boost converter. boost from around 1.8V and buck from 6-9V to drive a luxeon led. I need a schematic to get started and i'll figure out the writing of the code. Please help! Thanks!
I'm on project about buck-boost regulator. I've just reached Vout=-7V.I need Vout=-10V, Iout=20mA. Anyone can help me? Regards!
Im trying to design a simple DC-DC current controlled buck boost converter, and im having a tough time. I calculated the inductor value by using this eq. L=Vin^2/(10f*Iout*Vout) Where Vin= 12V Vout= 6-18V (used 18.) Iout= 1Amax f=200kHz I can get the converter to boost just fine, up to 28V or so. But i cant get it to (...)
Hi I going to design on chip buck boost DC2DC convertor Vin=3.3V Vout=1.7-4.5V Transitor ,wchich I have is only for 3.3V voltage :cry: How I can design this Dc2Dc for Vout=4.5V What is the topology for this designs Thanks
I am facing a problem in simulating the gate driver ic ir2117 with a buck-boost converter in orcad pspice. I have tested the buck-boost with a pulsed source and it is working fine but when i use ir2117 to drive the gate, the current through the nmos becomes too high and spiky and the output voltage falls drastically. I (...)
i am wondering if you have got the simulink model for buck-boost converter or not,,
Your schematic shows an inverting buck-boost converter topology, with wrong switch transistor polarity (N rather than P) and reversed diode, as said. A regular boost converter should serve your purpose You are mentioning a NMOS transistor but placed a N-JFET in your schematic.
What helped me to grasp the principles of switched-coil converters was an animated, interactive simulator. Below is a link to my conceptualization of a simple buck-boost. Click it to open the website, load my schematic, and run it on your computer. (Click Allow to load the Java applet.) Watch th
Hi, In usual practice primary switch of buck converter allows current to flow through inductor series with load. But here when Primary switch is on we have one more switch which allows to store energy only in Inductor. And when both switches are open stored energy is delivered to load. Hope now working of circuit is clear Thanks Grittin
If you want 240V at 1.5A then you must input 30A at 12V, or 15A at 24V. Add 15 percent to make up losses. You will need to make sure there is very little resistance, in order to pass 30A. This is a jump of 20X. It may work better if you were to interleave two or more boost converters. To get an idea whether your design is possible... Click
Actually my circuit was soft switching buck boost converter. I modified it as a flyback converter. I need this to work in MATLAB , then only I can design transformer, controller chip etc for doing hardware.
Another way to generate the -12V would be to use an inverting dc/dc converter -- this is sometimes known as a buck/boost converter. Do a google search and you will find lots of information about this converter. It is very popular and you can find control ICs from ON Semiconductor, National Semiconductor, Texas Instruments, etc. Best regards, [t
I need a schematic about buck regulator, boost regulator, LDO regulator and code (*.asm, *.v). Who can help me? Thanks! With best regard. :cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry:
it's a mains fed, my main problem is which topology to use? I need buck-boost, Highly efficient design , with multiple output voltages. Why a full bridge? what about split-pi or "resonant zero voltage" switched ? Regarding this webpage: I selected split-pi since it has very hi
Could you write some others details about the converter e.g. topology (buck, boost, ...), feedback type (voltage mode, current mode, ...), functioning mode (CCM, DCM, ...), voltage on input/output and so on... Do you've some circuit schematic? Bye
but he need it in buck/boost design from 0-430v
I'm currently working on a wireless battery charger circuit.I need some help figuring out why I have a particular problem and any means of solving it. In the attached simplified schematic, you will see a PLL controlling pulsed charging of a battery which is powered by a class E supply, regulated and through a buck boost to keep voltage (...)
your schematic looks like a noninverting buck boost. S1 and S3 should be ON at the same time with S2 and S4 OFF. S2 and S4 can be diodes.
there is no way you can use lm317 in this case. if you refer to the data-sheet you will see that the minimum input to outputs difference is 2.5V or more. so on 5 v supply you can get only 2.5V. even you use a LDO like LT1117-5, it needs 200mV drop, so the minimum voltage is 5.2V. if you can work with a bit lower voltage you can use this LDO. if you
Hello, I am doing SMPS's for a single product which sometimes runs off a battery, and sometimes off the secondary rail of an offline converter. So: I am doing a boost converter as follows:- V(in) = 2.1V V(out) = 27V P(out) = 2W Switching frequency = 100KHz (I have a 5V power rail available to act as a bias supply) Also,
I am desgining a DC DC buck boost converter based on H bridge and feed back network. I need to make a gate driver for the NMOS as without it the feedback loop doesnt work. If anybody has some guideline for designing a NMOS gate driver schematic for ams370 or UMC130nmrf please help.
Hi, I need to design a -100V output from 4.5 to 5 V supply output current required is close to 1mA.The IC should operate on Fixed transformer is prefered. So i was looking towards inverting buck boost topology & is examining the IC MAX1846. There are two problems im facing.. 1)Since the current requirement is too low.Will it cause
These integrated solutions all work I am pretty sure and thank you. Has anyone seen a way todo it using discrete components and avoiding the tapped coil? Hi, For Discrete implementation , take a look at buck-boost topology. All of these integrated circuits use this.Take a look at these : [url=en.wi
Hello everyone, I'm designing a DC-DC converter system. That is user input voltage is 12V from battery, voltage output regulable form 150V(or 200V) to 600V with the power leve max is 600W. I will implement methods, that is system will be divide into two stages: DC-DC stage and Voltage Regulator stage. +DC-DC stage user push-pul
Hi friends, I am working on a project solar charge controller using MPT612. PWM frequency is 20khz. I am facing problem with battery current measurement. A resistor is connected in series with battery negative and drop across the resistor is taken for measuring current. This differential signal is connected to OP-AMP for amplification. i
Dear Cheers Hi where is your schematic? there are more arrangement of buck boost converter available . Best Wishes Goldsmith
1. Use FETs (or a relay); you'll get a lower on resistance, which will improve your efficiency... each active BJT will drop ~(0.2V * charging current) watts, each. 2. Be careful with two generators in series. You'll limit yourself to the minimum current produced between the pair of them. You might consider keeping them in parallel and running t
The schematic ist correct, it's a pretty standard buck-boost converter. You'll need to implement a current controller that sets the PWM duty cycle to operate the converter with defined output current. Of course the controller must be fast enough to keep up with the dI/dt rate defined by the inductor. Overcurrent shutdown triggered by IGBT (...)
Hi All I am trying to find a program using ATmega16 about any dc-dc converter control e.g. buck, boost and so on. It is not easy. Almost is about inverters controlling some motors. Anyone help me, please?
Are you just simulating results, or have you actually built the circuit? For simulation, you should do a small signal average model of the buck converter, meaning you replace the switching components with an analog voltage which is proportional to the error amplifier output. That will allow you to look at things like stability and transient respo
A buck-boost converter can convert a positive supply to negative. schematic showing the basic You will need to add control circuitry. The .5 ohm resistor is a 'token' value added to represent some amount of
Apart from circuit details - there are more dubious points - the exact behaviour of the boost converter part can be only guessed without a simulation. For the time beeing I'll assume that it's working somehow. But how's the efficiency, does it use a reasonable operation point of the solar panel? How about in- and output voltages and currents wi
The MCP1253-ADJ is an inductorless, positive regulating, low noise charge pump DC-to-DC converter. It has an adjustable output of either 1.5V to 5.0V and can deliver 120mA of load current at the desired regulated output voltage. Since the device incorporates an automatic buck/boost feature, it will maintain the regulated output voltage whether the
Hi there, I have some problems using LTC3780 for charging an lead-acid battery. I did manage to make a working buck-boost power supply with LTC3780 using the schematic form datasheet(for tests I managed to get 12,7V at 48W from 7-18V supply), but having it charging a battery from PV(power supply simulated) module failed. The symptoms are: (...)
Hi, I am working on few of the analog ICs such as synchronous rectifier boost/buck Converter (DC-DC Controller) (MAX1763). The problem I am facing is that internal MOSFET is not working while for DC-DC converter (External MOSFET) it works fine.. Another application of Current limiting Switch ( TPS203x), there is a significant voltage drop acro
I had to spend a lot of time running simulations, before I could comprehend the operation of a buck converter (also boost and buckboost types). I particular found the Falstad simulator to be helpful. It is animated. I use it as an alternate to my own homebrew simulator. Click 'okay' in the window asking to load
My Project is BDC which can step up and step down 96V DC to 400V DC which has half bridge non Isolated configuration. Presently i m using UC3844 and UC3842 Current mode PWM IC's for buck and boost operation resp. now i am facing the problem in step down the voltage during buck opertion.i am confused how to drive the High side Mosfet in (...)