Deltatango
Junior Member level 3
It is a tiny 6pin smd semiconductor marked M801 and is used in a 4.5v SMP @ 1A.
The circuit is based on the TNYxxxx chip with the usual optical feedback coupler which is fed by this M801, my first thought it was a TL431 format but those I have seen have the 431 tag, then I spotted another device marked S801 by ABLIC and began to wonder as these devices are used for voltage setting, with cheap import power supplies that are smp below 6volts they are a bit rough with some resorting to a standard zener to keep that optocoupler happy because a TL431 seems cranky trying to set a stable voltage that low.
From what I see that optocoupler wants about 2v to fire its LED plus 2.5v for the TL431 there is not much left to feed a standing current from say 5v output, so I figure that this 801 must be some other device.
Can anyone help in its identification please.............
Many Thanks from David
The circuit is based on the TNYxxxx chip with the usual optical feedback coupler which is fed by this M801, my first thought it was a TL431 format but those I have seen have the 431 tag, then I spotted another device marked S801 by ABLIC and began to wonder as these devices are used for voltage setting, with cheap import power supplies that are smp below 6volts they are a bit rough with some resorting to a standard zener to keep that optocoupler happy because a TL431 seems cranky trying to set a stable voltage that low.
From what I see that optocoupler wants about 2v to fire its LED plus 2.5v for the TL431 there is not much left to feed a standing current from say 5v output, so I figure that this 801 must be some other device.
Can anyone help in its identification please.............
Many Thanks from David