Author Topic: Buck boost using 555 timer / PWM - 555  (Read 4340 times)

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Offline SZA

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Buck boost using 555 timer / PWM - 555
« on: October 09, 2013, 03:52:02 am »
Im currently using a similar circuit to drive a MOSFET. The required frequency is 50kHz, how do i achieve this (calculations / formula)?

IS there any way to obtain variable frequency? (what if we replace the 1k with pot) :-//
 

Online poorchava

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Re: Buck boost using 555 timer / PWM - 555
« Reply #1 on: October 09, 2013, 08:59:15 am »
Why an NE555? It's good for many things, but you can make way better SMPS with dedicated chips (starting with a $0.10 MC34063).

I love the smell of FR4 in the morning!
 

Online Psi

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Re: Buck boost using 555 timer / PWM - 555
« Reply #2 on: October 09, 2013, 10:28:56 am »
TL494 is another useful PWM psu control chip.
You can often salvage them from old electronics, ATX power supplies, car amps, etc.

Greek letter 'Psi' (not Pounds per Square Inch)
 


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