3lectrokid
Member
Hello,
I have got a small problem. I have a basic buck boost circuit shown below:
It produces between 50-100v open load (the simulation is wrong)
Here are my values
Input Voltage=5V
Transistor HFE=890
555 Output=4000hz - 50% duty
Capacitor size=1000uf 63v
Inductor size=unknown - came form a pc power supply unit
Diode =5819 schottky diode
Saturation resistor=470 ohms
If i connect a 12v PC fan to the output the voltage drops to about 7v. Why is the voltage decrease so great and is there a way to to decrease the voltage decrease?
I have got a small problem. I have a basic buck boost circuit shown below:
It produces between 50-100v open load (the simulation is wrong)
Here are my values
Input Voltage=5V
Transistor HFE=890
555 Output=4000hz - 50% duty
Capacitor size=1000uf 63v
Inductor size=unknown - came form a pc power supply unit
Diode =5819 schottky diode
Saturation resistor=470 ohms
If i connect a 12v PC fan to the output the voltage drops to about 7v. Why is the voltage decrease so great and is there a way to to decrease the voltage decrease?
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