treez
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Today, 18:41Try the LT8705...this is a "bock or boost" converter........it acts as a buck if vin>vout, and acts as a boost of vout > vin LT8705...16 replies | 338 view(s) -
Today, 15:39I replaced the shorted LLC converter FETs in the 400V PSU...and the IR21531S, but when i re-assembled and switched on it went bang again and wouldnt...1 replies | 141 view(s)
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Today, 08:27treez started a thread Vias covered in solder resist get outgassing problems? in PCB Routing Schematic Layout software and SimulationHi We have a load of 0.3mm vias on our 4 layer PCB. Surely it will be OK if I coat them in solder resist? We wont get “outgassing”? (Outgassing is...0 replies | 46 view(s)
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Yesterday, 18:43if its a lithium battery then it may well have a circuit in it which stops you from being able to discharge it further down than 3v. If not then ...5 replies | 201 view(s)
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Yesterday, 18:37In Buck-Boost you will tend to get more switching losses as your fet off state voltage will gernerally be higher. Also, the rms fet current will be...16 replies | 338 view(s)
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Yesterday, 06:15treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power Electronics5 and 6 are primary bias. I am not sure if their were scorch marks, they just told us we failed. If it goes over 3mA when 3.5kv is applied for one...13 replies | 579 view(s)
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15th October 2019, 20:51Hello, Does anyone have a schematic for this HSPY-400-01 Bench power supply? (400V, 1A) ...1 replies | 141 view(s)
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15th October 2019, 19:13treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsThanks, the pinout is as attached. There was tubing used yes. As you know, There is easily 8mm betweeen primary pins and secondary pins. ...13 replies | 579 view(s)
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13th October 2019, 20:55treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsThanks, its re-inforced insulation.13 replies | 579 view(s)
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13th October 2019, 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) ...13 replies | 579 view(s)
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13th October 2019, 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...13 replies | 579 view(s)
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13th October 2019, 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,...13 replies | 579 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 | 266 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 | 448 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 | 448 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 | 259 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 | 259 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 | 783 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 | 147 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 | 282 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 | 979 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 | 388 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 | 168 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 | 253 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 | 153 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 | 711 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 | 772 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 | 772 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 | 270 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 | 270 view(s)
About treez
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- April 5, 1982 (37)
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- cyclist
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- cambridge
- Interests:
- football, cycling
- Occupation:
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