1
Projects, Designs, and Technical Stuff / Re: more modern version of tl494?
« Last post by 2strokeforever on Today at 03:32:44 am »I have a strong preference for the UC3525.
It is reassuring to see in the internal block diagram, the steering flip-flop being clocked directly by the oscillator and also the latch at the comparator's output.
Not so for the TL598 despite the claims. The extra opamp might seem useful but can be difficult to achieve fast current limiting with it.
With the UC3525, I implement fast pulse-by-pulse limiting by pulling down the soft-start pin.
Great info, I have heard a few people saying their problems went away after switching from the TLxxx to the 3525 series, this could explain it.
From the UC3525 datasheet
All transitions of the voltage on the shutdown pin should be within the time frame of one clock cycle and not
repeated at a frequency higher than 10 clock cycles.
Does this pose a problem to fast current limiting, or do you hold the voltage low for 10 cycles?
Thanks