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41 Threads found on mc34063a
can be used as flyback controller…as long as you don’t exceed its voltage ratings of course.
I have made a DC-DC step-up converter using mc34063a with following components Ct=31 pF Rsc=0.682 Ohm Lmin=4 uH Co=701 uF R=180 Ohm R1=1k R2=3k and I used for the design with following input parameters Vin: 3V Vout: 5V Iout: 100mA Vripple: 1mV(pp) Fmin: 700kHz The problem is the power cons
I need to import and simulate the on semiconductor mc34063, however asc and asy are missing form the zip: ON Semiconductor Simulation Models for example mc34063a SPICE MODEL (70.0kB)
What is the difference if any?
i need more current! You didn't reveal your input voltage nor your output current requirement! You want us to guess? Perhaps this one could do the job. S. fig. 10
I was trying to make a DC/DC boost converter with mc34063a. It is a good IC for the purpose but its not working well. Having a lots of trouble. Here is the PCB diagram: 100154 And the circuit diagram is here: 100158 The problems are: * Its taking high current at startup, frequently M
Try using this tool, the schematic will change according to the design parameters and it will show you optimal values: Brian.
From my experience with the mc34063a, When you talk Power never use simulator or even BreadBoard, Always work with PCB, For the Schematic: 1-Change the capacitor from 470pF to 1.5nF 2-Use a different Diode from this general purpose Shottky ( Ultra High Response time around 25 to 35nS ) 3-Change the Output Capacitor from 470uF to 220uF25Vdc Re
You can design one yourself.Use mc34063a and DIY inductor.The IC is available for @ Rs10 @ sunrom Rs12 @ ventor.and at local shops for @Rs30.Make quick search in google for schematics.
You may experiment with this calculator for MC34063 here for different
déj? vu (posts #2 - #5) I already used MC34063 as previously mentioned, but I won't suggest it as a "simple switcher", particularly not for a beginner. A late comment about the table in #4. It can't be found in a recent mc34063a datasheet. I have Rev.6 (12 years old) and latest Rev23, both don't sho
looks pretty versatile - step up, step down, inverting step up, inverting step down.
hi, Does anyone has the circuit for mc34063a with constant 12V output from 5V to 15V input. Thanks
The comparator has a 1.25V reference so the feedback always scales to the same threshold of 1.25V. In the inverse mode the 1.25V reference is
Use very cheap mc34063a here is calculator:
hi all!!!! first i'll start with a TINY description of my project . a SOLENOID KICKER. so i want a 160v momentary power source to fire the solenoid. question is how can i reach to this voltage? the possible reasponse is to discharge 3 ,2200uf, capasitors in series.(3 * 50v =150v) my source is a 2A ,12v planin
Hello i want to to convert a 12VDC to 1.2VDC (600mA to 700mA). I tried using the LM317 but it overheats very fast so i thought it would be better if i use a switching step-down converter. So i used the mc34063a with the components shown in the attached schematic. About a minute after putting a load of ~100mA the mc34063a starts getting hot and the
MC34063 should be able to do what you want mc34063a design tool MC34063 Step Up/Down/Inverting Switching Regulator - Calculator MC34063 boost Alex
A voltage regulator like 78xx can only regulate to a lower output, the input must be at least 2 volts higher than the output. You need a step up converter, something like MC34063 can be a simple solution for up to 1.5A but here are many more focus.
Use an mc34063a DC-DC converter circuit for #110 – Let’s Design a DC to DC Switchmode Converter
I was wondering what chip those regulators use now, so thanks for the still mc34063a but surface mount now.... The spec of the chip is max 0.5Amp, so advertising anything more would be incorrect, :roll: or if the circuit current limit resistors made for 1Amp, it will most certainly fail in due course. should expect ~85% effici
this will be *very* useful to you ...: mc34063a design tool
This is the links and mc34063a design tool
Use this calculator for MC34063 mc34063a design tool or MC34063 Step Up/Down/Inverting Switching Regulator - Calculator then design the schematic in proteus. Alex
if you have 17v AC RMS then if you use a full wave rectifier with a capacitor you will get a little less than 17*1.414=24v DC d you want to convert this to a higher voltage you need a step up circuit for example MC34063 mc34063a design tool A
Look at the design tool at mc34063a design tool it will give you a schematic and include the values. You may need to drop the input voltage to 3.5, this should be OK as the cells will drop as they discharge anyway. Brian.
Use MC34063. Most DC converters for mobiles use this chip (is the cheaper switcher). You need 3 resistors, 2 caps, one diode and one inductor.
I am trying to think if it is possible to adjust the mc34063a SMPS controller (or a similar controller) with an external voltage or MCU control. I could use a digital potentiometer but those are not cheap. Is there some analog solution I can use to change the feedback pin voltage? It doesn't matter too much if it's not a linear response as the
If you don't think that the chip is old, i suggest you to use mc34063a from Motorola, and with minimum components it can do your Job. I only hope that the current demand for -5V won't be much. You might get hold of the datasheet where in application examples , including possible pcb artwork were given.
Hi, I have to amend an existing circuit consisting of a mc34063a and a P-MOS switch. It is a downconverter, from 12V to 3.3V/1.5A . I, like you, do this out of helping and am not being paid. This is for a good cause. The circuit has a coil which gets extremely hot, so hot, that it kills the neighboring capacitors over time. Exchanging th
Hi, Im trying to go from 12V to 15V but I seem to be having an issue. I have the inverting setup giving me -15V and it works fine, but I cant get the +15V to work. In this data sheet on page 6 there is the circuit im using. I dont know about the value of the resistor connected to pin 8, so
Hi all, I need a constant current 1.5A for battery charging using a mc34063a IC and an external power transistor that may be MJE3055 or N-MOS. Regards, Fernando
Check this site , may be useful to you : you can use two ic , one for -B and other for +B sorry if I don't understand the concept of your question. regards-
MC33063 is like MC34063 and there is everything you need...
use this site :
While the BOOK that Chethan posted is an awexome resource (thanks!), I think it might be a little bit overwhelming for a beginner. I would look at the mc34063a data sheet and app note that I posted in your other thread to get a good idea of the BLOCK architecture of a peak current, output voltage regulated boost converter. A typical boost convert
Yes it is posible. and I made it for my pic programmer. Mc34063 used. Here is the calculator:
Anyone can share schematics of mc34063a for convert 5 VDC to 13VDC . thank you very much .
hi, i prefer mc34063a /or another dc-dc/ 5V to 13V step up conversion. then you can power the programmer with almost any wall AC adapter best regards
Here you can find a design tool for MC34063 regards
this is the links and mc34063a design tool