Hi all
I'm now working with a 555 timer for a boost converter. What I realised is when I put a smaller cap or resistor the voltage drops. So is that because the 555 has a frequency limit ? And if yes tell me the name of an IC that can hold more freq and I can find in regular electronics store (not an IC as rare as diamond -_-)

 

The NE555 works up to 100kHz (different letter prefixes have different specs - check which one you have)
What frequency are you trying to get?
What values of R & C are you using?
Post the complete schematic for best help with the converter.

 

Hi all
I'm now working with a 555 tiner for a boost converter. What I realised is when I put a smaller cap or resistor the voltage drops. So is that because the 555 has a frequency limit ? And if yes tell me the name of an IC that can hold more freq and I can find in regular electronics store (not an IC as rare as diamond -_-)

The standard 555 does pretty good to about 100Khz. The CMOS version (LMC555) is much faster, but can't drive as much current. There might be other reasons for the voltage drop. Maybe you should post your schematic.

 

Hi all
I'm now working with a 555 tiner for a boost converter. What I realised is when I put a smaller cap or resistor the voltage drops. So is that because the 555 has a frequency limit ? And if yes tell me the name of an IC that can hold more freq and I can find in regular electronics store (not an IC as rare as diamond -_-)

How high do you want to go?
Your 555 should make about 250k but will be, as you noticed, less than full voltage swing as you pass 100k HZ

lmc555 will get you to about 3MHz

Any higher, you should buy a crystal oscillator.

 

Any higher, you should buy a crystal oscillator.

I have never come across a crystal controlled boost converter.

 

I have never come across a crystal controlled boost converter.

I missed the boost converter part. Thanks.

 

what kind of

boost converter

?

 

Here is a simple step up switcher using a CMOS 555 timer. It is a burst mode switcher rather than a PWM switcher. It uses the transistor as both the "reference voltage" and a comparator to gate the oscillator on and off. The oscillator runs at about 300 KHz. (The waveform shown is on the timing cap).

 

Thanks all it was pretty helpful