ORDERING INFORMATION. See general marking information in the device marking section on page 11 of this data sheet. DEVICE MARKING INFORMATION. 1. A Switching Voltage Regulators are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for A Switching Voltage. DESCRIPTION. The MCA series is a monolithic control circuit delivering the main functions for DC-DC voltage converting. ORDERING INFORMATION.

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Inspriation come from ETO member Mr Al who mentioned his interest in a high efficiency 5v supply to power his Tablet Datashedt during power blackouts etc, see his thread here; http: The circuit for this buck converter is nothing original, basically it is the circuit from the IC datasheet, and all I did was to use an external PFET instead of the external PNP transistor shown in the datasheet.

The external PFET allows currents up to a few amps at good efficiency, however I have used hard current limiting at 1. Energy conversion efficiency is very high due mainly to the choice of external components used with the cheap SMPS IC. Hello MrRB, Thanks for posting that 43063a, it looks very promising. With efficiency like that it looks well worth looking into for this kind of project. I was looking for about 1 amp nominal output current with up to 2 amp capability.

Since the efficiency is 93 percent at 1 amp out this should work nicely. 340633a have to dig out my parts and build up a breadboard too next. BTW, when you look at the output waveshape for 340063a while do you see any quick jumps once in a while? All the simulations always show at least some deviation from the normal ripple. This would be easier to see with a wider time period for looking at the output ripple voltage.

Hi Mr AL, thanks. It went together pretty quick in about an hour, I think it took a couple more to write it up and photos, scan the schematic etc. datashee

A (ETC) PDF技术资料下载 A 供应信息 IC Datasheet 数据表 (2/2 页)

Re the waveform skipping etc, that was not happening at currents over 0. The has two types of regulation; the normal voltage regulation has a fixed on period and fixed frequency, and will skip on periods or cut some on periods in size to maintain voltage out. It’s basically discontinuous, or very close to it, and quite erratic looking. The other regulation occurs from the current limit sense resistor. This actually reduces the length of the on period.

So with the parts values I chose it was peaking on the current limit and in sync with the inductor ripple and the internal oscillator.

Basically it used the current limit peaks to shorten the osc period from To get this effect you need the current limit set to about 1. Hi MrRB, Well, i am aware of how a peak current limit works in regulators but that’s not really the kind of regulation i would need for this project.

That’s basically good when we have a constant load. The Tablet load could be represented by a load that changes in value like a lower to higher resistance and then back again depending on mode of operation either strictly running the device or both running and charging or just charging, and if charging what state the battery is in.

All the time however 3463a need 5v regulation, so that means we absolutely have to use the voltage regulation mode of the ic chip. No way around it. Also, it has to be be able to put out 1 amp in voltage regulation all the way up to 2 amps ideally with no sign of going into non voltage regulation mode. So could you do a quick scope shot of this 3406a in voltage fatasheet


12v to 5v DC high efficiency SMPS buck converter using 34063 IC.

That would be nice to see too and i could compare with my notes. Unfortunately, I can’t draw the circuit in my phone and won’T be back home until the 2nd of Jan. But google Mosfet turnoff circuits. Well, i am aware of how a peak current limit works in regulators but that’s not really the kind of regulation i would need for this project.

It is shown for a N-chan Fet, reverse the diode and transistor polarity. Im going to be looking into this more and finally i’ll be building up the circuit. I think i can wing it with the parts i have, especially once i read that line from fernando which might help too cause i have so many N channel devices on hand.

Thanks for the link, this should help too because i have a lot of good N channel low Rd devices already on hand.

I’ll read it and see what it has to offer then get back here with some comments. Oh ok, that’s an app note about gate drivers I thought it was an app note that pertained directly to that chip. But thanks anyway and maybe i’ll use something from it. Oh ok, they also include home made boot strap drivers, which is a nice change. I was thinking of an entire inverted scheme, but this looks interesting too. Found some P channel devices, price range 1.

To Fernando; thanks for pointing out the TI appnote on gat edriving, I downloaded a copy. The fig13 example should be workable fine for the PFET, it just needs to be inverted and then driven from the junction between the two resistors. You might be able to get similar specs in something convenient like a TO pack but since it doesn’t need heatsinking you could use any package really.

Just an update for MrAl, re an earlier conversation where I was going to build a 6v 10Ah sealed lead acid battery datashest for a robot project. The board above was adapted to 3403a become a high efficiency smart charger for a 6v battery.

I added a brass angle shim and large sloder blob to cool the PFET which now never gets much warmer than body temp. Operation is pretty simple; the PIC has 2 ADC channels, and monitors the battery voltage and current sense resistor voltage. These are stacked so to get battery voltage it reads the current then subtracts that reading from the voltage to give true battery voltage.

Then datasbeet slowly adjusts PWM to keep battery voltage at the correct regulation and also limit current during the initial bulk charge to 1. The charger automatically selects between 7. Here’s how the board turned out, tidied up a bit and neat enough to be buried deep in a robot chassis.

Hi MrRB, Oh yeah pretty nice! I always meant datashedt try a PIC as feedback for voltage regulation but never got around to it. The program board i have does it that way too to regulate the 12v program vatasheet amplitude. Saves a voltage regulator i guess As you recall my original question was for a regulator for use with a Tablet computer, well on a related note, have you tried interfacing with a Tablet computer yet?

I was wondering if you might have some adtasheet on this or if not if you would be interested. The reason datasheeg bring this up in this thread is because im doing all this for a Tablet computer anyway, and also that if you havent used one for your test equipment you may be interested in looking into that.

The small Tablet computers make an exceptionally nice base for a number of different pieces of test equipment, a multi channel volt meter dataasheet one example.


The only problem i am having now is interfacing datashedt circuit to the Tablet because my Tablet doesnt have Bluetooth. It seems hard to get an external Bluetooth device to work too, so im looking for other ways. But you datasheer want to go with Bluetooth if you are interested. Let me know what you think about this if you can. Hi MrAL, sorry I don’t have any tablet experience at all, not owning one. Hmm, if you want to use bluetooth for data interfacing to the tablet there are lots of cheap bluetooth modules on ebay, just watch out as some are just the “module” but need a carrier PCB which means you need to make a PCB, some are a fraction more expensive but have the carrier PCB included togther with the module.

What other interfacing options does the tablet have? Personally I would prefer that to any RF comms as it will be higher datarate, simpler and probabl more reliable. Is your goal to get your smart charger to send comms data to the tablet to display 34063z the charging stats on the tablet screen? That would be very cool, especially if it was just the one USB lead.

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I take it you can write tablet apps like a program to display the voltages? Hi MrRB, That’s one goal yes, with the overall goal being able to monitor just about any process, and to start with to use the Tablet as a general purpose test bed for other plug in test equipment starting with a four channel volt meter. Let me elaborate just a little. Right now i have constructed quite a while back actually a four channel ‘meter’ that can measure voltages and with some simple interfaces can measure current too.

That allows easy testing of battery cells of just about any 334063a very versatile set up capabilities which allows testing of four cells simultaneously. What i’d like to do is use the Android Tablet the same way, even if it means creating new software for the Android environment rather than Windows. But i’d like it to be as versatile as the Windows based program panel. This language allows quick changes right on the Android Tablet so i can set up different things quite easily.

But what it doesnt do is read RS It doesnt have that built in and im not sure if it ever will. What it also does not have is Bluetooth, but since it uses the more current op sys the op sys supports Bluetooth.

Problem is getting a BT adapter that works with the Android Tablet. From what i have read now some dont work and some do, so it’s a toss up. Datsheet could be the Linux ones work but im not sure datazheet as i am quite new to this operating system and hardware.

I’ve even considered electrical stimulation of the touch pad itself in a designated area of the screen but that would be exceptionally slow, too slow for my purpose. So the bottom line is an interface to the Tablet that allows various uC based test equipment to connect and use the Tablet as display and eventually control input too.

But also it would be nice to be able to use that BASIC language as that would give me the datashee to change the program even if im not near to a PC to do actual Android programming Java or whatever. I started a new thread about this subject a few days ago: Please note that when i started that thread i thought the BASIC language would somehow handle an RS connection, but apparently it doesnt as i have now read. It does support Bluetooth.