MC34063 real iC (MC33063 spice model) suitability ?

Thread Starter

ci139

Joined Jul 11, 2016
1,696
i thought it's a capable thing until this test design (computed the xx3X063 step-up by the d/s formulas ... except the fMIN is a random guess)
universal controller versus retail one
... a remainder : the output here is near 1W /!\
9VdA-Flshr-xR20.png9VdA-Flshr-xR3.png
 
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AnalogKid

Joined Aug 1, 2013
8,806
Undecipherable garbage. Also, there is no 33063 controller in there. If either of the drawings is supposed to be an equivalent circuit, they are not.

BTW, there are ***billions*** of power supplies operating right now using the 33063. If there is a problem with a circuit, it is *not* with the chip.

ak
 

BobaMosfet

Joined Jul 1, 2009
1,292
actually it's very simple (Yes/No) one :

Is it possible to use the *MC34063 for an efficient (≥68%) SMPS design
that powers the 1W 9V LED light from (used) 3.7V 800mAh Li-Po
--or--
this* controller can't do it

( i will push it* below the specified 3V VsMIN as far the chip* allows )

View attachment 213563
https://www.onsemi.com/pub/Collateral/MC34063A-D.PDF
What you're saying is that you want a 3.7V @ 800mAh to be converted to 9V at 1W. let's do some math to see if energy conversion is even possible using Watt's law:

Input:

P = IE
P = 0.800 * 3.7
P = 2.96 Watts

Output:

I = P/E
I = 1/9
I = 0.111 Amps

So you need to know if the MC34063 can output 9V at 0.111A. BOOST configuration: here's how that works out:

1596138971773.png

Yes, it can.
 

Thread Starter

ci139

Joined Jul 11, 2016
1,696
Thanks , i'll try that ...
( ... but meanwhile i already made another v. that performs better in simulation ( , the capacitor values are also a bit large ) )
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9VdA-Flshr-xR21.png
 
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Thread Starter

ci139

Joined Jul 11, 2016
1,696
now tried the Excel v. ...
? interesting , but in principle ok
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9VdA-Flshr-xR21.png 9VdA-Flshr-xR21-h.png
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cc + voltage regulation (may be a poor choice at "too low" input voltages) // not fully tested , incomplete
9VdA-Flshr-xR50.png
 
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Thread Starter

ci139

Joined Jul 11, 2016
1,696
as i only got the de-soldered SOP-8 SMPS controller chip from some failed device i needed a test-jig
. . . that - came out more complex than the "Led Flasher" itself

The CT & RE would be sufficient to induce timer oscillations
but i intend to test the IPK limiter also . . .

xv - 3x063-iC - chp-TEST.png
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i'm using the 1-st model not yet the 2-nd one (from #7 , the thumb below . . . Right-Click , Open in new tab)

MC33063A.png
 
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