unfortunately I couldn't even get the pwm wave I got yesterday.can you suggest me a simple schematic.I don't want to give up at the beginning of the road when I am so enthusiastic about sg3525 :/
This circuit is in two sections. One generates a triangle wave. The other accepts an incoming voltage and derives a PWM signal. Very similar to sine PWM.can you suggest me a simple schematic.
This circuit is in two sections. One generates a triangle wave. The other accepts an incoming voltage and derives a PWM signal. Very similar to sine PWM.
Power supply is 12V single-ended, implied in op amp parameters.
View attachment 186782
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Click link below to see above schematic in Falstad's animated interactive simulator:
1) Opens website Falstad.com/circuit
2) Loads my schematic into the simulator.
3) Runs it on your computer.
tinyurl.com/ylpqja2q
Toggle Full Screen (under File menu)
Enlarge scope traces by dragging mouse upward on border of scope region.
I don't think that the 3525 uses a triangle wave. Believe it is a
hard discharge and a sloe ramp. RT may be a current-setting
(w/ VREF or a derivative of) and a current source on CT
produces the linear ramp.
I prefer a triangle wave with switched current ramp myself, but
that is as not amenable to synchronization as the sawtooth
(SYNC jams the discharge and the timing follows). Trying that
on a triangle wave makes weird (maybe OK, maybe not) stuff
because you have to keep twave bottom and top away from the
and "jamming" it does something else. creating a variable delay
from SYNC to "getting into normal range".
Regardless, without being to access and over-drive the error amp
you can't force a duty, and without access at all you can't use
the error amp in a buffer configuration.
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