NE555CN PWM Circuit

Audioguru

Joined Dec 20, 2007
11,249
When the discharge capacitor conducts a fairly high current then it gets hot.
If your circuit has a huge timing capacitor with a maximum duty cycle then the chip will overheat if it is not allowed some cooling time.
 

Thread Starter

tracecom

Joined Apr 16, 2010
3,944
When the discharge capacitor conducts a fairly high current then it gets hot.
If your circuit has a huge timing capacitor with a maximum duty cycle then the chip will overheat if it is not allowed some cooling time.
Yes, but of course the circuit I am using doesn't discharge any capacitor through pin 7, and the first quote seems to mean that it's ok to sink up to 35 mA through pin 7. My 19.47mA should be absolutely no problem.
 

bertus

Joined Apr 5, 2008
21,312
Hello,

With a capacitor discharge, the current will drop over time.
With your led the current will be constant.

Bertus
 
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