identifying suitable FET's
i have quick question fet's. i'll talking p-channel here.
a short while ago told me on datasheet vg when quoting rds(on) identifies if logic level fet. i bought , using without problems fqp27p06 (p channel fet). in vg quoted -10v rds(on) of 0.07ohm.
i thought vg quoted @ rds(on) have -5v or particular fet ok use @ logic level because of vth (-2v -4v) , low rds(on). meaning @ logic level rds(on) higher quoted in datasheet because low begin fet won't heat as other fet's 0.4 ohm resistance @ vg -10v being used @ logic level , therefore safe use.
i guess sum i'm asking is. can p channel fet called logic level , used arduino if vth -2v -4v , rds(on) still low enough @ logic level compared rds(on) @ -10v quoted in datasheet?
a short while ago told me on datasheet vg when quoting rds(on) identifies if logic level fet. i bought , using without problems fqp27p06 (p channel fet). in vg quoted -10v rds(on) of 0.07ohm.
i thought vg quoted @ rds(on) have -5v or particular fet ok use @ logic level because of vth (-2v -4v) , low rds(on). meaning @ logic level rds(on) higher quoted in datasheet because low begin fet won't heat as other fet's 0.4 ohm resistance @ vg -10v being used @ logic level , therefore safe use.
i guess sum i'm asking is. can p channel fet called logic level , used arduino if vth -2v -4v , rds(on) still low enough @ logic level compared rds(on) @ -10v quoted in datasheet?
errr...maybe.
you not have logic-level fet. vgs rating @ 2v-4v says if need supply 250ua through fet (from source drain) won't need more -4v on gate-to-source junction. beyond that, don't tell until have -10v gate-to-source, @ point source 13.5a , have on-resistance of 0.07 ohms.
in between...you don't know (well, can predict , model, there no guarantees). reason using "without problems" because not source lot of current through fet, -5v gate voltage enough job, doubt fet's on resistance (if measure it) near 0.07 ohms.
--
the rugged circuits yellowjacket: 802.11 wifi module atmega328p microcontroller, 1.6" x 1.2", bootloader
you not have logic-level fet. vgs rating @ 2v-4v says if need supply 250ua through fet (from source drain) won't need more -4v on gate-to-source junction. beyond that, don't tell until have -10v gate-to-source, @ point source 13.5a , have on-resistance of 0.07 ohms.
in between...you don't know (well, can predict , model, there no guarantees). reason using "without problems" because not source lot of current through fet, -5v gate voltage enough job, doubt fet's on resistance (if measure it) near 0.07 ohms.
--
the rugged circuits yellowjacket: 802.11 wifi module atmega328p microcontroller, 1.6" x 1.2", bootloader
Arduino Forum > Using Arduino > General Electronics > identifying suitable FET's
arduino
Comments
Post a Comment