Hi I'm really sorry I missed to place the schematic. It's because I'm assuming you'll be using the circuit of MC34603's default template.
Okay here's the setup. 220VAC>>Transformer>>24VAC fed through the rectifier diodes with 1000uF 50V caps on it. After that, the voltage output around 32V is fed directly to the circuit of MC34603 which I found from the site
https://www.bobtech.ro/tutoriale/co...e-mc34063a-mc34063-step-down-step-up-inverter
Here are the values I placed for the calculator:
Vin 32V
Vout 9V
Iout 750mA
Vripple 18mV
Fmin 25Khz
And here are the values that came out:
Ct=479 pF
Ipk=1500 mA
Rsc=0.2 Ohm
Lmin=176 uH
Co=417 uF
R1=1k R2=6.2k (9V)
I assembled them exactly as I could on a breadboard. I used 470pF non polarized cap instead of 479pF, 470uF elec cap instead of 417uF. I used also 0.2ohm 2W resistor. R1 and R2 are also with the exact values. I didn't missed using 1N5819 on the circuit. The only different thing and I doubt the most is the inductor which I said I used RCH110NP-151K. It is rated 150uH.
That is the exact part number the seller gave me when she handed me the inductor.
I just don't think I'm good on how to use this inductor. It would be easy if it's just 2 pins because I'll just plug it on the board but it has 4 pins so I'm having a hard time dealing with it and the datasheet seems not to be so specific or lacking some examples. I'm currently looking for more examples to understand how to use this.
Thank you so much for those much much inputs I got from you. I will be waiting for more details.
Regards,
lloyd