At 07:46 PM 12/18/2009, you wrote:
>I have part numbers and data sheets for a number of SMD 3 leaded boost
>conveter LED driver ICs. Most of Chinese origin. None that I have seen are
>TO92, but that's just a matter of packaging.
>
>I can provide some part numbers and maybe web \sites if interested, but can
>derive as good a datasheet yourself as you may be able to get officially in
>many cases.
>
>A few quick mentions: Some come in 3 or 4 or 5 pin variants.
>Some have direct coil drive or external FET gate drive versions.
>
>Ground
>Power in / Inductor / power out to output diode (unless separate pin as
>yours has)
>Ground
>Chip enable  - less common  - usually active ho=igh so can also be used for
>low Vin cutoff.
>Voltage sense (rare)
>
>CE6360, CE9908A / HY3100 / VS077A, AY7530xx, eg A7530ER.
>Zetex: ZXSC100,
>
>There are two ways to do 3 pins.
>One is to have a LED output pin and internal diode.
>
>The nasty and usual way is to connect the LED directly to the
>inductor/Vin/LED out pin - LED is fged with pulses of high current.. Death
>for most modern LEDs if long lifetin\me is desired.
>I pointed this out to Zetex as many of their ap notes show this method. They
>didn't answer ;-)
>
>Zetex ZXLD381 is a ttpical example.
>It's in SOT23-3 but coul as easily be TO92.
>One cell operation (0.9V+)
>
>Zetex ap notes here
>
>     http://www.diodes.com/destools/
>
>EUREKA:
>http://www.lzmcu.com/uploaddir/porducts%20guild/aicall.pdf
>Better  http://www.analog.com.tw/pdf/SG09Q1.pdf
>
>AIC1638, AIC1639 AIC1642 seem to be what you want (not xxx2115) and are
>available on TO92.
>AIC are Tauwanese - I've used some of their products and been duly impressed
>with the results.
>
>Whether these products match you product in any way is another matter :-)

I don't think those particular AIC parts employ a quite high enough switching
frequency to use a 10uH inductor, but the Zetex part isn't bad with 10uH and
it's available from Digikey, albeit at a fairly handsome price (0.72/100).

Any idea of the quantity price of the AIC1595 series (2A buck regulator)?
I'm impressed with a part that contains an "internal precious reference".


Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com


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