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#13
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Randolph > wrote in :
> > "TeGGeR®" wrote: >> >> Got a URL or a pic? I'd like to add that diode. >> >> The pics I found showed resistors, but no diodes. > > I have looked long and hard at the photos of the ignitor. The darlington > device is definitely from STM (http:/www.stm.com). The part number is > hard to decipher, but I am quite certain the first line of the part > number is BUxy41. I can't for the life of me see if "x" is actually a > character or just picture noise. The "y" looks like an "8" or a "9". The > second line of the part number almost certainly is "ZT". This is > consistent with "BU941ZT", which is an actual STM part number with a > package type like the one in the ignitor photo. The description is "HIGH > VOLTAGE IGNITION COIL DRIVER NPN POWER TRANSISTOR". See > http://www.st.com/stonline/books/ascii/docs/5288.htm for details. The > data sheet is at http://www.st.com/stonline/books/pdf/docs/5288.pdf. The > data sheet shows the diode between emitter and collector. The diode is INTERNAL to the transistor package. Probably on the same substrate as the xstr. > > The IC in the photo looks like it has part number U2226B, and a good > guess is that the TFK in the first line stand for Telefunken, a German > semiconductor manufacturer later renamed TEMIC and eventually bought by > Vishay. I have not found any data sheet for the U2226B, but I believe it > is an opto-coupler. > I found ICs that were specifically designed for ignition control and driving the Darlingtons,but none with the same pin count of the IC pictured,nor any similarity to its part number. I do not believe it's an optocoupler,but a full control IC.Probably with circuitry to square up(shape) the drive pulse,and provide enough drive current,and IIRC,the ICs monitored and regulated coil current.(that would enable faster switching) -- Jim Yanik jyanik at kua.net |
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