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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Replacement Transformer Started by ncag Today at 7: 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.
Im going to be looking into this more and finally i’ll be building up the circuit. That would be very cool, especially if it was just the one USB lead. The reason i 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.
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. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
To get this effect you need the current limit set to about 1. 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. I always meant to try a PIC as feedback for voltage regulation but never got around to it. Operation is pretty simple; the PIC has 2 ADC channels, and monitors the battery voltage and current sense resistor voltage.
This language allows quick changes right on the Android Tablet so i can set up different things quite easily. The small Tablet computers make an exceptionally nice base for a number of different pieces of test equipment, a multi channel volt meter just one example.

But i’d like it to be as versatile as the Windows based program panel. 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. From xatasheet i have read now some dont work and some do, so it’s a toss up. 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.
The other regulation occurs from the current limit sense resistor. The program board i have does it that way too to regulate the 12v program pulse amplitude. I added a brass angle shim and large sloder blob to cool the PFET which now never gets much warmer than body temp. All the time however we need 5v regulation, so that means we absolutely have to use the voltage regulation mode of the ic chip.
Hi MrRB, Well, i am datahseet of how a peak current limit works in regulators but that’s not really the kind of regulation i would need for this project.
Selling , , A with , , A Datasheet PDF of these parts.
So the bottom line is an interface to the Tablet that allows various uC based test equipment to connect and datasheey the Tablet as display and eventually control input too. For a better experience, please enable JavaScript in your browser before proceeding. What i’d like to do is use the Android Tablet the same way, even if it means creating new software for dwtasheet Android environment rather than Windows.
Articles Top Articles Search resources. 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. 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.
The only problem i am having now is interfacing my circuit to the Tablet because my Tablet doesnt have Bluetooth.
To participate you need to register. Datasheets, Manuals or Parts. I’ll have to dig out my parts and datadheet up a breadboard too next.
34063A PDF Datasheet浏览和下载
You must log in or register to reply here. Inspriation come from ETO member Mr Al who mentioned his interest in a high efficiency 5v supply to datashest his Tablet PC during power blackouts etc, see his thread here; http: The charger automatically selects between 7. Since the efficiency is 93 percent at 1 amp out this should work nicely. Problem is getting a BT adapter that works with the Android Tablet.

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 340063a many N channel devices on hand.
Just an update for MrAl, re an earlier conversation where I was going to build a 6v 10Ah sealed lead acid battery charger for a robot project.
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. Basically it used the current limit peaks to shorten the osc period from 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.
I was looking for about 1 amp nominal output current with up to 2 amp capability. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at
