18 Jun
2009
18 Jun
'09
2:57 p.m.
Dave McGuire wrote:
On Jun 18, 2009, at 2:19 PM, Tony Duell wrote:
One datapoint: Motorola Linear 1976, MC1723 datasheet shows a switching config.
National Application Notes AN1(1967), AN8(1968) and AN2(1969) show the LM100
regulator IC in switching configs.
The LM100 looks like the predecessor to the 723, a reference and error amp in
one package. It disappears from later databooks, presumably obsoleted by the 723.
I've heard a rumour that early 723 data
sheets only show it as a
linear
regulator, the designers didn't realise it could be used as a
switcher.
After it started getting used in the latter configuration, example
circuits were added to the data sheet. Does anyone have an early
723 data
sheet which doesn't show a swtiching regulator circuit?
I have some pretty old NS databooks; I will check.