Help! Why is this MC34063 INV dose not work properly?

[ali6x944]

Hi everyone,
I made this switching INV with MC34063, and it is not operating properly...
It should output -15v but it is outputting -5v pluse the cap dose not make any oscillations like it should be considering the fact that I changed the dameged chip I made sure of all connections and thay all seem ok...
Photors:
https://drive.google.com/folderview?id=0B5vW-k7HbsL4UkxvYU1hM3QtMTQ

[ali6x944]

List of parts:
3 one ohm resistors
2 one k resistors
1 10k resistor
4.7k resistor smd 1208
100uh inductor
1nf cap
470uf 25v cap
SS34 smd shottky barrier diode
3mm red led
MC34063A SOIC-8
Calculations:
R1=1k
R2=11k
Vin=3v
Vout=-15v
Iout=100mA
Vsat=0.7 -I picked the worst case scenario-
Vf=0.4 -see instantaneous forward current to voltage drop graphf
Fout=32k
Vripple(pk-pk)=0.1mV
ton/toff=6.695652174
(ton+toff)=3.125*10^-5
toff=4.060734463*10^-6
ton=2.718926554*10^-5
Ct=1nf
Ipk(switch)=~1.5
Rsc=~0.3
L(min)=~42uH
Co=470uF -its kinda over kill-

[JoeO]

Schematic?

[ali6x944]

Oh.... I forgot I will post it in a second

[ali6x944]

Its here:
https://drive.google.com/folderview?id=0B5vW-k7HbsL4UkxvYU1hM3QtMTQ

[ali6x944]

 Now did u see it the pdf

[bktemp]

Connection between pin 7+8 and input capacitor are missing in your circuit.

[ali6x944]

Input capacitor is not necessary
I fixed it and still not working properly....
High output voltage of -5v instead of -15v and no oscillations on pin 3

[JoeO]

There are many differences between your schematic and the schematic from the spec sheet.

[ali6x944]

Mine is a mirror image so it is flipped...
Don't forget the connection between pin 8,7 and I mistaken
And drawn the feedback resistor connections.

[ali6x944]

I'm not quite sure but if the output cap or timing cap is shorted or damegd it will give a similar behavior so I will check...

[Ravenghost]

Could it be that you connected a load which resistance is too small and it goes into current limit(i believe yours is limited to 0.5-0.7A) and therefore output voltage goes down?

[ali6x944]

I don't think so, because I designed it for an output current of 100mA and and the led with the resistor I chose would give a current draw of around 3 mA, but I will remove the led and see what will happen

[JoeO]

Your schematic and the sample schematic are different in many ways.

Your schematic is WRONG!

[Skimask]

because I designed it for an output current of 100mA

You designed it?
How?
Did you consult the datasheet?
Or just throw random marks on a piece of paper somewhat resembling a schematic, collect more random parts that looked fairly similar to the things on that piece of paper, and start soldering random stuff to other random stuff?

but I will remove the led and see what will happen

Ya that'll fix everything!!!

Uhh...No...

[ali6x944]

I removed the led and nothing happened...
Also I redrawn the schematic to make it clear because I missed some connections on the board, sorry if I  intimidated some of you  by not updating the schematic when I modified the circuit on the board so please forgive me for what happened.

[ali6x944]

So what shall I do??