treez
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Yesterday, 20:55treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsThanks, its re-inforced insulation.7 replies | 216 view(s) -
Yesterday, 18:33treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsYes, and as discussed, its primary, bias and secondary with TIW. The primary bias coil is the last to be wound on it, (so its the top layer) ...7 replies | 216 view(s)
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Yesterday, 18:03treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsTEX-ELZ Triple insulated wire by Furukawa is surely rated to 3.5kv for one minute? https://www.furukawa.co.jp/tex-e/en/product/texe_feature.html...7 replies | 216 view(s)
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Yesterday, 13:40treez started a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsHello, Our contractor designed a 10W, 24Vout, offline Flyback SMPS for 240VAC input. He had a split primary and a bias coil on the primary side,...7 replies | 216 view(s)
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12th October 2019, 14:40treez started a thread Protecting the inputs of HV7802 current monitor from damage due to inrush current in Analog Circuit DesignPage 4 of the HV7802 datasheet (RHS of page, 2nd paragraph down), states that adding a resistor into the LOAD pin gives protection for the HV7802. ...4 replies | 225 view(s)
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11th October 2019, 06:14treez replied to a thread Film capacitor failed in flyback smps at high temperature? in Power ElectronicsThanks, i wonder how high the temp has to be, and for how long, with the cap of the top post to get this failure? Its datasheet doesnt tell of this.5 replies | 418 view(s)
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9th October 2019, 08:01treez started a thread Film capacitor failed in flyback smps at high temperature? in Power ElectronicsHello, We are using the ECW-FD2J185 (1.8uf, 630v) film capacitor in our offline flyback smps, 240vac input. It is for 24v, 10w output. We sent...5 replies | 418 view(s)
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7th October 2019, 06:39treez replied to a thread Input stage to 24W buckboost LED driver is high in component count. in Power ElectronicsThanks, yes if we cant find low enough rdson fets (which we probably wont at the high vds) then we will use a standard diode.....3 replies | 234 view(s)
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6th October 2019, 19:00treez started a thread Input stage to 24W buckboost LED driver is high in component count. in Power ElectronicsHi , The attached is an LTspice sim and pdf schem of the input stage to a 8-136vdc input , 24w buckboost led driver. The Vin may also go up to...3 replies | 234 view(s)
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6th October 2019, 18:11Thanks asdf44, your RHS example above is absolutely great. It looks so good that id like to simulate it to see it going.,...but ltspice doent do dep...13 replies | 746 view(s)
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6th October 2019, 12:31treez started a thread Reverse polarity protection with FET is somewhat blighted by CDG capacitance in Analog Circuit DesignHi, It is necessary to provide reverse polarity protection for a 24W Buckboost LED driver with Vin = 8 to 136VDC. (when vin <18v, then power can be...1 replies | 140 view(s)
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5th October 2019, 20:58treez started a thread Why should a solder joint be less than 110degc? in Elementary Electronic Questionshttps://www.vishay.com/docs/28870/pulseloadsmdlimit.pdf Page 1 of the above says a solder joint should not be 110deg C or more..why? I looked on...3 replies | 264 view(s)
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5th October 2019, 20:56treez replied to a thread [moved] Why Zener getting heat at no load in Capacitor power supply arrangement.. in Power Electronicshttps://www.edaboard.com/showthread.php?386831-Supply-5V-5mA-from-the-240VAC-mains-without-SMPS the above is also about cap droppers...there is a...14 replies | 951 view(s)
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5th October 2019, 20:45treez replied to a thread Why use diff mode inductors rated for 6A(rms) when Input current is only 833mA(rms) in Power ElectronicsThanks, but this was just a power supply for the led lighting in the aircraft....though maybe that could be important i admit. - - - Updated - - -...6 replies | 368 view(s)
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5th October 2019, 20:43https://ac-dc.power.com/design-support/product-documents/application-notes/an-18-topswitch-flyback-transformer/1 replies | 156 view(s)
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5th October 2019, 20:20perhaps you need a current monitor and a microcontroller, so that the micro can allow the overcurrent to be drawn for just long enough for you to...5 replies | 228 view(s)
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5th October 2019, 19:06Hi, Our contractor has done a prototype 60W offline single stage, PFC’d Flyback (240VAC). The primary FET is a metal tabbed TO220 and is...1 replies | 144 view(s)
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5th October 2019, 16:49treez replied to a thread Gerbers and drills offset from one another...cant view properly in GC prevue in PCB Routing Schematic Layout software and SimulationThanks, out by a factor of 2.54 suggests drill is in imperial and gerbers are in metric. We have no control over this...our external pcb layout guy...8 replies | 672 view(s)
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5th October 2019, 16:24treez replied to a thread PCB flexion and cracking of SMD capacitors in PCB Routing Schematic Layout software and SimulationThanks for this https://www.digikey.com/Site/Global/Layouts/DownloadPdf.ashx?pdfUrl=9A23B3687C14472482403C3540CC7267 ...figure 1 of this suggests...7 replies | 727 view(s)
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5th October 2019, 13:45treez started a thread PCB flexion and cracking of SMD capacitors in PCB Routing Schematic Layout software and SimulationHi, For the following nine SMD ceramic capacitors on a PCB, which capacitor would you say is most likely to suffer cracking? I am talking about...7 replies | 727 view(s)
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5th October 2019, 12:44treez replied to a thread Lumens/Watt in LEDs when forward current is very low.? in Professional Hardware and Electronics DesignThanks, i mean for current from 0 to 50mA in the above mentioned example (page 10, top graph)3 replies | 240 view(s)
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5th October 2019, 11:38treez started a thread Lumens/Watt in LEDs when forward current is very low.? in Professional Hardware and Electronics DesignPage 10, top graph, (datasheet below)…what happens to the graph below 50mA?....is it just like a continuation of the same general shallow curvature?...3 replies | 240 view(s)
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4th October 2019, 21:35here's some that may be good for you...in the pdf in the top post...just ignore the cap dropper...14 replies | 680 view(s)
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4th October 2019, 21:26use the LT1243 by linear.com in the free download LTSPice simulator...it is pin for pin compatible I attachch an ltspice sim of it for you Change...4 replies | 249 view(s)
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4th October 2019, 21:16treez started a thread Gerbers and drills offset from one another...cant view properly in GC prevue in PCB Routing Schematic Layout software and SimulationHi, Our PCB layout guy sends us the PCB gerbers to check off….sometimes the drill holes are nicely on the PCB image…but sometimes the drill holes...8 replies | 672 view(s)
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4th October 2019, 20:26yes....and your fsw is 400khz and you are doing it on breadboard......im sorry but i dont think its worth your while to continue unless you do it on...19 replies | 796 view(s)
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4th October 2019, 15:25treez started a thread PIC16F1947 land pattern doesnt tell of solder resist "stencil" in PCB Routing Schematic Layout software and SimulationHi PIC16F1947 TQFP (64 pin) datasheet gives top copper land pattern on page 453, but does not say where the solder resist mask should go. Do you...2 replies | 211 view(s)
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4th October 2019, 06:16Thanks, use of IGBTs as linear regulators is very interesting, as they are tougher than fets and more resilient to current surges. I have lost count...13 replies | 746 view(s)
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4th October 2019, 06:03treez replied to a thread Why use diff mode inductors rated for 6A(rms) when Input current is only 833mA(rms) in Power ElectronicsThanks, thats very true, but the size of these four inductors on the PCB......do you know if this use of massively over-rated inductors is common tro...6 replies | 368 view(s)
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3rd October 2019, 20:27treez started a thread What is meant by "coating" when PCB track spacing is concerned? in PCB Routing Schematic Layout software and SimulationHi The track spacing calculator on this page…. https://www.smps.us/pcbtracespacing.html …where it says “coating”, does that mean special...1 replies | 215 view(s)
About treez
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- April 5, 1982 (37)
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- cyclist
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- football, cycling
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