Not Very well Drawn, But the Circuit in Post-1 Will Work.
However the Supply Voltage should be 10 to 12 Volts.
R2 should be 100 to150 Ohms.
L1 should be a High Q, 100uH High Current Choke rated at 2 amps or more.
The 1N4007 Will work but a HF4007 or Other High Speed diodes are Better.
Hi,
Without load the output voltage is not determined and may become very high. Too high for the MOSFET.
Klaus
Yes, but the circuit has no means for it, except a manual duty cycle adjustment. It may work if you have a constant load, e.g. a resistor. Below a certain output current, the converter operation transits to DCM (discontinuous conduction mode) and the duty cycle has to be varied with the load. For open output, the duty cycle needs to go down to about zero. Usual boost converters have a voltage regulation loop controlling the duty cycle.cannot i stable the output voltage by adjusting the duty cycle of mosfet.
You need an output voltage feedback and a (fast enough) regulation loop.so, how can i avoid the output voltage to boost more than 8V.
Hi,
You need an output voltage feedback and a (fast enough) regulation loop.
Otherwise you need to install a high power zener that disspates all the power that is not used by the load.
May I ask why you don´t use a ready to buy step up regulator IC (boost regulator IC)?
There are many hundred different ones from various manufacturers. All come with compact - less part count - design, all including voltage regulation and other safety features: like short circuit protection....
I personally won´t waste that much time and money to design it using NE555....
Klaus
I didn´t talk about a "module" but about an IC, which should be much cheaper than a module.here i india we get the boost converter module or any related IC's at around 2 US $
--> expectable without control loop.I tried the same using zener diode, so i am getting fixed output voltage, but when the input voltage drops, the outputs also drops.
the input itself it 5V and output what i need is around 8V, where input current is approx 1.5 Amps and output load current is around 700 mA.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?