PCB Trace width question.
i want use example found @ http://playground.arduino.cc/code/acphasecontrol control speed of pumps. pumps, located @ http://chuggerpumps.com/product.php?prodid=237, 220v, 290 watt, pulling around 1.3 amps correct?
the board house i've been using itead. outside conductive layers 35um. i'm using trace width calculator: http://www.desmith.net/nmds/electronics/tracewidth.html
i put in following number:
amps: 2
rise: 1 degree
thickness: 35um
ambient: 40 (it gets hot out in garage/driveway!)
trace length: 20mm (i put ssrs , h11aa1 right @ edge of board, less 20mm)
the output need 125mil of trace width, >71mil of space.
i have no reason doubt correctness of number, want put guys see if number seems feasible. there reason can't put 70 mil trace on each side?
the board house i've been using itead. outside conductive layers 35um. i'm using trace width calculator: http://www.desmith.net/nmds/electronics/tracewidth.html
i put in following number:
amps: 2
rise: 1 degree
thickness: 35um
ambient: 40 (it gets hot out in garage/driveway!)
trace length: 20mm (i put ssrs , h11aa1 right @ edge of board, less 20mm)
the output need 125mil of trace width, >71mil of space.
i have no reason doubt correctness of number, want put guys see if number seems feasible. there reason can't put 70 mil trace on each side?
depends temperature rise happy tolerate. 1 degree not much.
using traces on both sides of board not dissipate heat in quite same way, be
approximately true 2 70mil traces equivalent 1 140mil trace (think surface area). feels
to me 2 x 70mil replace 125mil ok.
some heat dissipation along traces components soldered on.
if ambient goes 40c, 5c, let alone 1c isn't v significant. electronics runs lot hotter.
rapid thermal variations damaging aspects of temperature management - get
differential expansion leading mechanical stresses - implicated in long term failure modes.
having trace vary 20c on regular basis bad - although trace width flexible
choice want try conservative - can increase 1c 2 or 3 think.
using traces on both sides of board not dissipate heat in quite same way, be
approximately true 2 70mil traces equivalent 1 140mil trace (think surface area). feels
to me 2 x 70mil replace 125mil ok.
some heat dissipation along traces components soldered on.
if ambient goes 40c, 5c, let alone 1c isn't v significant. electronics runs lot hotter.
rapid thermal variations damaging aspects of temperature management - get
differential expansion leading mechanical stresses - implicated in long term failure modes.
having trace vary 20c on regular basis bad - although trace width flexible
choice want try conservative - can increase 1c 2 or 3 think.
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