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From: firstname.lastname@example.org (R.Legg)
Subject: Re: WTD: TL494 type with comparator and latch
Date: 14 Nov 2002 15:11:42 -0800
NNTP-Posting-Date: 14 Nov 2002 23:11:42 GMT
"Joseph Goldburg" wrote in message news:...
> HI All,
> Is there a variant of the Texas Instruments TL494 available that replaces
> one of the internal op amps with a comparator and latch for pulse current
> sensing, I seem to recall seeing such a variant being available but don't
> know the source. TL494 or an equivalent is made by several different
> manufacturers, not just Texas.
> Thanks in advance.
Cherry made a CS594 that suppressed double pulses in 494-type circuits
- no longer advertised. Others made 'A' variants of the 494 which may
or may not have advertised this feature. Because TI didn't do it, the
feature was never standardized with that pin-out.
I don't believe you could ever turn off the outputs quickly through
the linear error amplifiers. The DT pin could be used for this, but it
was not internally latching either.
Because the TL494 is designed to modulate the turn-on edge, it's the
last choice in any circuit requiring pulse-by-pulse current limiting
due to inherent fighting between the analog and digital control loops.
Removal of the overload finds the linear control section asking for
100%duty cycle, so that re-entry is often accompanied by periods of
potential core saturation, outside of the load transient response.
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