treez
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Yesterday, 22:20We have discussed here how Current mode control can’t be used in a half bridge SMPS. However, the following document states that a “Current Doubler...8 replies | 809 view(s) -
Yesterday, 21:55treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, no we didnt, but we will parallel them.37 replies | 1849 view(s)
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Yesterday, 13:59treez replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsThanks, we will end up using back-to-back power FETs with isolated drive due to the total 32A of current. We will parallel them. What worries us...37 replies | 1849 view(s)
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Yesterday, 12:02treez replied to a thread Need to reduce drain voltage spike in LM5019 Buck converter in Power ElectronicsThanks, Ill try the "common mode" test5 replies | 248 view(s)
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Yesterday, 11:27treez replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThanks, i suppose there is no power supply on the "tethered drone"?...just the BLDC inverters...which must us high voltage IGBTs?.... Maybe somne...2 replies | 148 view(s)
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17th January 2020, 20:29treez started a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsHi, Regarding tethered drones such as the LIGH-T 4, which is rated at 1.2kW…. https://elistair.com/ligh-t-tethered-station-for-drone/ Do you...2 replies | 148 view(s)
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15th January 2020, 22:15treez replied to a thread Need to reduce drain voltage spike in LM5019 Buck converter in Power ElectronicsThanks, it seems a little odd that in the datasheet "ABS MAX's" it says the SW pin should be no higher than "vin+0.3v".......whereas the vin pin can...5 replies | 248 view(s)
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15th January 2020, 21:44treez started a thread Need to reduce drain voltage spike in LM5019 Buck converter in Power ElectronicsHi, We are using the LM5019 for a Buck converter Vin = 60V Vout = 12V Iout = 7mA We notice a spike on the LM5019 drain voltage of 20V in...5 replies | 248 view(s)
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12th January 2020, 18:34treez replied to a thread ZMR330: 3V3 Linear regulator needs diode connected cathode to input voltage? in Elementary Electronic QuestionsThanks, i mean a diode connected anode to output, cathode to input... in the old days, such a diode was always needed to protect the regulator in...6 replies | 414 view(s)
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12th January 2020, 14:50treez started a thread ZMR330: 3V3 Linear regulator needs diode connected cathode to input voltage? in Elementary Electronic QuestionsHi, Question as per title. ZMR330 datasheet https://www.diodes.com/assets/Datasheets/ZMRSERIES.pdf ..the datasheet doesnt say such a diode is...6 replies | 414 view(s)
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12th January 2020, 11:54treez replied to a thread Resistor at input to high side current monitor IC in Elementary Electronic QuestionsThanks yes, We have Rsense = 0R75, RA=1k and RB=3k3. I made RP=43k and readings (voltage on RB) were badly inaccurate. Now that we have RP=RA,...3 replies | 309 view(s)
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12th January 2020, 00:30treez started a thread Resistor at input to high side current monitor IC in Elementary Electronic QuestionsHi, Should resistor RP on page 1 of the HV7802 datasheet ideally be equal to the value of RA? HV7802 datasheet...3 replies | 309 view(s)
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11th January 2020, 00:55Hi, In the attached schematic, I had been soldering components on and off the board many times, in the vicinity of this circuit. On some...3 replies | 322 view(s)
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5th January 2020, 19:54treez replied to a thread 16A 250V switch rated for 10000 ops at mains peak or zero cross? in Elementary Electronic Questionsi agree its low energy, though cant it spark off oxidation in the contacts? Also, the damage is cumulative, and the contact chrome coating is...7 replies | 541 view(s)
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5th January 2020, 18:00treez replied to a thread 16A 250V switch rated for 10000 ops at mains peak or zero cross? in Elementary Electronic QuestionsThanks, by "contact opening time" you are speaking of "contact bouncing time"? I believe we would agree that an ideal world resistive circuit,...7 replies | 541 view(s)
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5th January 2020, 14:59treez started a thread 16A 250V switch rated for 10000 ops at mains peak or zero cross? in Elementary Electronic QuestionsHi, The below switch says its rated for 10000 operations. But does that mean 10000 operations with the switching happening at the zero crossings, or...7 replies | 541 view(s)
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4th January 2020, 21:50treez replied to a thread Is this the reason there's so few 2 Transistor Fwd Sync Rect controllers? in Power ElectronicsActrually, adding RCD clamps across the sync FETs does solve the problem with the LT1681/LTC1698 combo. (As attached LTspice sim and pdf.) In...3 replies | 388 view(s)
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4th January 2020, 18:05treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, what we actually have on the pcb is the schem in #18 ...we are currently wangling it to be as the schem in #17 (by not fitting the bjt...22 replies | 1721 view(s)
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4th January 2020, 16:47treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsThanks, yes, Thanks for them, but we dont have money for a pcb respin...and so are trying to wangle what we have.22 replies | 1721 view(s)
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4th January 2020, 16:13treez replied to a thread Opamp buffer with 400nF output capacitance going unstable? in Elementary Electronic QuestionsAswell as post #17 above, please advise on this one here.... Do you believe the attached would also be unstable?, since really, the opamp will ...22 replies | 1721 view(s)
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4th January 2020, 15:28"5" is working with the internal 7V5 reference. The input and corresponding VAOUT voltages given in the schem of post #13 are in accordance with the...16 replies | 944 view(s)
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4th January 2020, 00:44Thanks, but in our (admittedly very unusual) use case we don’t mind. The micro will just repetitively read the LED current and simply repeatedly...16 replies | 944 view(s)
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4th January 2020, 00:25treez started a thread Is this the reason there's so few 2 Transistor Fwd Sync Rect controllers? in Power ElectronicsThis highlights an issue with the LT1681/LTC1698 Two Transistor Forward Synchronous Rectifier controller.... I have the LTspice sim working now...3 replies | 388 view(s)
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3rd January 2020, 16:56Which of the attached methods of manually setting the VAOUT pin voltage of LT1248 do you think is the best for the case here? There are 5 ways shown.16 replies | 944 view(s)
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3rd January 2020, 14:28Thanks yes, that wil be useful if we do it with an isolated topology...in this case we are just doing it with a Boost PFC. So for us, it seems the...16 replies | 944 view(s)
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3rd January 2020, 00:29treez replied to a thread Circuit to delay and shorten pulses of a pulse train? in Analog Circuit DesignThanks, for SN74LVC1G17 i see IOH = 32mA for Vcc = 4.5V....thats 140 Ohms? (for output impedance)4 replies | 349 view(s)
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2nd January 2020, 23:23yes true, i am hoping that there is overload protection...even if there is not, its probable (but not certain) that it could handle the overload for...8 replies | 614 view(s)
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2nd January 2020, 23:16treez started a thread Circuit to delay and shorten pulses of a pulse train? in Analog Circuit DesignHi We have pulses which we need to delay by some approx. 280ns, and indeed we need to make the pulses shorter, again by some approx. 280ns The...4 replies | 349 view(s)
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2nd January 2020, 20:39USB is 5v....so put a 5 ohm resistor across it, and see if it stays as 5V...if vout drops beloe 5v...then its a 500mA one8 replies | 614 view(s)
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2nd January 2020, 20:37treez replied to a thread LT1681 Forward controller in offline use? (low current sense threshold of 150mV) in Power ElectronicsThanks, i think we would agree that using a current sense transformer would always reduce noise problems with the current sense pin? (assuming...4 replies | 311 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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