Hi
I wanna ask about the 555 timer
Regardless the circuit how is its output current determined ???
Is it determind by the value of R1 & R2 or one of them in an astable circuit for example ? Or it is not determined by anything and the timer just gives all the current it can that is written in its datasheet ??

 

The current depends on the load attached to the output and should not exceed the rating given in the datasheet.

 

Or it is not determined by anything and the timer just gives all the current it can that is written in its datasheet ??

It depends on the load and the timer type. CMOS versions can't sink/source as much current as the bipolar versions.

 

Thank u
And if the current in the datasheet = 200 mA for example can i have a load that takes all this current or it will be harder for the timer to work very ? Will it heat up ?

 

Thank u
And if the current in the datasheet = 200 mA for example can i have a load that takes all this current or it will be harder for the timer to work very ? Will it heat up ?

Generally, it's never good idea to subject a device to its absolute maximum ratings.

 

At max load there will be more Pdiss in the part, but if you
are meeting ratings should be fine.

What specifically is the load ? Resistive, inductive, capacitive ?

Regards, Dana.

 

Ok Thanks

 

The 555 ic chip can't afford too much heat, so the better is that you just use I=1/3(200) mA, when the load is draw too much current then you can use bjt or MOSFET to do the driver job.