AP1 Dc-to-dc Converter Control Circuits The is a monolithic control circuit containing the primary functions required for DC-to-DC converters. AP1 datasheet, AP1 circuit, AP1 data sheet: SLS – DC-TO-DC CONVERTER CONTROL CIRCUITS,alldatasheet, datasheet, Datasheet. ORDERING INFORMATION. See general marking information in the device marking section on page 11 of this data sheet. DEVICE MARKING INFORMATION. 1.

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Dec 27, 1. Feb 11, 5, 1, This project converts 12v DC to a regulated 5v DC at up to 1.

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The circuit for this 3406a3p1 converter is nothing original, basically it is the circuit from the IC datasheet, and all I did was to use an external PFET 34036ap1 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. The prototype was tested in hardware, please excuse the messiness. The layout is far from ideal, I did it this way to allow easy swapping of parts and just to be lazy, to save the effort of making xatasheet PCB. However it still works pretty good, and a proper PCB would improve performance a little bit. It is efficient enough to not need a heatsink even at 5v 1.

I used a TO 60v dual 10A schottky diode pack total 20A. I think it is a uH or uH value, but sorry I lost datashet paperwork.

A few other powdered-iron toroid inductors were tried and it is not that critical. It datasbeet 51 turns of 1. The inductor measured 0. Sorry for the hand-drawn schematic! As you can see the circuit is minimum parts. PFET turnon is good at 0.

The ohm resistor could be reduced to speed up the turnoff, but this would datahseet losses in that resistor so it is a tradeoff. The IC does all the clever stuff, mainly it regulates voltage at 1. Because of the 6k8: Max current limit resistor. The resistor between Vin and pin7 sets the max inductor current limiting, this was set by me to roughly 0.


The current limit is best at slightly above the max required current. This gives better safety and also helps stabilise oscillation. CT used the datasheet value of 1nF. That gave oscillator value of The filter caps; uF on the input and uF on the output were chosen to be “good enough”. Output ripple was approx mV which is fine. Dec 28, 2. Scope current L1 inductor at 5v 1.

eatasheet Same thing but at 1A. Frequency dropped a bit, closer to the oscillator freq of Current ripple now larger from approx 0. Scope current L1 inductor at 5v 0. Here the L1 current has gone “discontinuous” meaning the L1 current is reduced to zero during the end of the off period, and has to start from 0 amps again during every on period.

Typical of the regulation system used in a IC, the timing will “stutter” as needed to maintain Vout regulation at a steady 5. This does not matter and the can be quite energy efficiency when “stuttering” in discontinuous mode like this.

At less than 0. The PFET on period is the top of the waveform. However the turnoff is poor, because the turnoff is from a ohm resistor and is slow at 0. This costs significant efficiency.

Because it is a switching regulator there will always be some ripple on the DC output voltage. This is shown when running at 5v dafasheet. If you want to invest some effort it can be improved further; 1. The inductor is just an ordinary “off the shelf” type. A properly selected inductor or a good core hand wound for best performance could allow lower operating frequency and less current ripple, and maybe less DC ohms, and maybe pick up another 0.

For lower operating 43063ap1 CT should also be increased to 1. The PFET turnoff is too slow. Adding a cheap digital buffer IC could pick up 0. My PCB has very thin long tracks. Using a well designed PCB with thick short tracks for the main current paths might save 30 milliohms and give maybe 34063zp1.

Value in the uH range, you may need to try a couple of different types. Modifying the circuit for 12v car operation. This circuit was designed for a car battery, generally I would use a ohm resistor instead of the 10 ohm resistor.

Also a 13v zener diode across the ohm resistor will add safety for the PFET. A 12v line filter might also be advised, they can be bought from auto stores.

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Modifying the circuit for 24v operation.

Use ohms instead of 10 ohms, so it now has two ohm resistors. And again a 13v zener from PFET gate to source pin.

(PDF) 34063AP1 Datasheet download

With a 24v Vin you should use a higher inductor value and larger inductor core, uH and up are recommended. Modifying the circuit for high output currents. The circuit is meant for 5v out, It will do ok up to 2. The diode pack will be fine, but the PFET should be rated for a few times more current than your max current. Just change the 6k8 resistor, to change the output voltage to something other than 5.

Like most SMPS circuits it works best with roughly 2: Dec 28, 3. Nov 4, This is fantastic, thank you for posting it. There is a ton of stuff for me to pour over. What would be the difference between your circuit and a regulator combination like a and an emitter follower?

Would it be efficiency? Dec 29, 4. Mar 24, 21, 2, Yes, much more efficient, therefor much less heat. It is why SMPS switching mode power supplies are so popular.

The downside is they are a bit noisier than linear regulators. Dec 29, 5. Feb 19, 6, Great performance for the price. Dec 29, 6. PS – I just bought some of that strip PC 34063app1 based on your picture.

Do you use that in place of breadboards? Dec 29, 7.


Feb 14, Have you looked at any of the newer SMPS chips with integrated switch? There must be hundreds of them. They were incredibly expensive but sometimes you could get samples. Now days, you can hardly go wrong with some of the Chinese bargains on ebay. Dec 29, 8. Dec 29, 9.

I googled and found that a “buck regulator” and a “buck converter” are the same, and WIKI dwtasheet a nice page on it. Jan 1, Sep 7, 2, Apr 28, 3, Or at best, it switches off. My Watts toroid gives nearly 60V without load, and still