treez
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Yesterday, 13:34thanks , i appreciate that if a NPN in CommEm has <0.3v across its Collec-Emit (what we want), then it is going to be saturated......thing is, we...15 replies | 411 view(s) -
Yesterday, 11:37treez replied to a thread Passing radiated EMC with an SMPS involves an element of luck...how much agree? in Professional Hardware and Electronics DesignThanks, sorry i mis-worded, i meant that whilst one is doing the design and PCB, there's no fixed way of caluclating what radiated emissions...3 replies | 167 view(s)
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17th August 2019, 23:44treez started a thread Passing radiated EMC with an SMPS involves an element of luck...how much agree? in Professional Hardware and Electronics DesignI once worked with one of the UK’s finest SMPS design engineers. They were working for the same company as myself at the time. They had already...3 replies | 167 view(s)
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17th August 2019, 12:50treez replied to a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power ElectronicsThanks, is their any way for us to know how they did the hi-pot test on the mains transformer in the power supply? Ie what voltage time and current...17 replies | 690 view(s)
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17th August 2019, 12:40treez started a thread Small high voltage rated mains common mode chokes not availabel offtheshelf in Power ElectronicsHello, A contractor has provided us with a prototype product which is very good quality. It is an offline, non-isolated , SMPS LED driver of 10W....0 replies | 76 view(s)
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16th August 2019, 20:35thanks, we have BJTs with very very little base current in them (to save energy)....and we wonder if there Hfe will always be big enough to get them...15 replies | 411 view(s)
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16th August 2019, 18:14Is there any situation , where literally any SOT23 or SOT323 NPN with VCE voltage rating of <65V may suffer a drop in Hfe down to less than...15 replies | 411 view(s)
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15th August 2019, 20:17treez started a thread Package Marking for ST25DV04K-IER6S3 in PCB Routing Schematic Layout software and SimulationHi, Do you know what is the package marking for the SO8N version of this chip? The datasheet doesnt say......0 replies | 116 view(s)
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14th August 2019, 19:29treez replied to a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power Electronicsthanks, all we want to do is repeat the same hi-pot test that Philips did for their approvals testing, to be sure that the power supply has...17 replies | 690 view(s)
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13th August 2019, 06:23treez replied to a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power ElectronicsThanks, but we notice that IEC61558 isnt mentioned in the datasheet17 replies | 690 view(s)
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12th August 2019, 20:28treez replied to a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power ElectronicsThanks very much.. We are wondering what kind of isolation test the following power supply is spec’d to?….. It’s the Philips Xitanium Xtreme...17 replies | 690 view(s)
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11th August 2019, 12:52Hello, For an FMMT491A BJT with 2.7mA flowing into its base and set up in common emitter mode….is there any set of circumstances (temperature,...15 replies | 411 view(s)
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11th August 2019, 12:01treez replied to a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power ElectronicsThanks. It is strange to me that power integrations, on their design software, only ever design the isolated flyback transformers to 3000vac for 1...17 replies | 690 view(s)
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11th August 2019, 00:24Hi, We have an SMD PCB for lighting...and we wish to ESD damage it....how may we best do this....i rubbed one over carpets and ran up and down...6 replies | 297 view(s)
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10th August 2019, 23:45Hi, For HV Buck using LNK304 as on page 6 of datasheet (2nd schem down)... LNK304 datasheet...1 replies | 142 view(s)
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10th August 2019, 14:39treez replied to a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power ElectronicsThe 3mA is the limit value for the leakage current that may flow when under the 3750vac stress for the given time....any more than 3mA flows and its...17 replies | 690 view(s)
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9th August 2019, 20:18treez started a thread 1 minute vs 1 second isolation voltage test for isolated offline SMPS transformer in Power ElectronicsSome offline transformers are spec'd for 3750vac for 1second (3mA). Some are spec'd for 3750vac for 1 minute (3mA). Generally, which...17 replies | 690 view(s)
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7th August 2019, 06:16treez replied to a thread Is FET operating withinin SOA?...Pulsed linear regulator in Power ElectronicsThanks woops sorry i realise the current scale doesnt show on the top post's waveform, here it is re-attached.3 replies | 197 view(s)
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6th August 2019, 20:52treez started a thread Is FET operating withinin SOA?...Pulsed linear regulator in Power ElectronicsHello, We have the following waveform in the STD1NK80Z FET (DPAK). It recurs every 10ms as shown. We need to know if this violates the SOA. To me,...3 replies | 197 view(s)
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4th August 2019, 00:16Hi Do you know of any cheap place in UK or Europe where we can take our offline PSU for conducted EMC testing?....it doesnt need to be a properly...3 replies | 602 view(s)
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3rd August 2019, 10:16Hi, When i program a PIC16FXXXX with XC8 , it doesnt give the right delay time __delay_(20m) gives 80ms or sometimes 160ms delay. Do you know why?...3 replies | 238 view(s)
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31st July 2019, 20:21treez started a thread Small transformer not useful for offline Flyback useage due to creepage problem in Power ElectronicsHi, The E13/7/4 Horizontal Bobbin by Epcos is not suitable for isolated offline Flybacks. This is because the secondary pins are less than 5mm...2 replies | 179 view(s)
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28th July 2019, 12:45treez replied to a thread Modifiying an offline LED driver PCB with EMC components on "flying wires" in Power ElectronicsThanks, being able to wire in a proto AC filter board to the main pcb, in order to try and trial out different filter components is of immense...4 replies | 314 view(s)
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28th July 2019, 01:31treez replied to a thread Modifiying an offline LED driver PCB with EMC components on "flying wires" in Power ElectronicsAnother point is that many isolated offline SMPS’s have Y Capacitors across the isolation barrier on both sides of the transformer. Do you agree...4 replies | 314 view(s)
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27th July 2019, 16:27treez replied to a thread Modifiying an offline LED driver PCB with EMC components on "flying wires" in Power Electronics~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Another point is that we would like to experiment with different values of diff mode inductors. As such, how good (or...4 replies | 314 view(s)
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27th July 2019, 13:52Your Vin is 10 to 48v Vout is 3 to 53v Iout is up to 10A. At 10Vin, your Iin is 53A max, so this will require paralled converters. I believe the...9 replies | 716 view(s)
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27th July 2019, 13:35treez started a thread Modifiying an offline LED driver PCB with EMC components on "flying wires" in Power ElectronicsHello, We have done an offline, 240VAC PFC’d Flyback LED driver. We have a slight failure of conducted emissions at 30MHz, as attached. In order...4 replies | 314 view(s)
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22nd July 2019, 06:13Thanks, i now wonder if we can make R215 = 22K, and then surely the hfe will be enough to make the second bjt's vce <0.2v? It turns out we didnt...7 replies | 413 view(s)
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21st July 2019, 21:28Thanks......it would need to be pfet, and i cant pull the gate down far enough as its only a 1.1v rail. (admittedly we could make a negative rail...8 replies | 514 view(s)
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21st July 2019, 21:04Hi , We need the “Output”of the following circuit to go from 1v to 1.1v as shown in the LTspice simulation. We are worried we may get too much VCE...8 replies | 514 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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