A flyback based on the new Infineon SiC

Started by Piotr Wyderski in sci.electronics.design1 year ago 2 replies

Some time ago James Arthur sent here a notification about the IMBF170R1K0M1XTMA1 SiC MOSFET. I have just re-prototyped one of my wide input...

Some time ago James Arthur sent here a notification about the IMBF170R1K0M1XTMA1 SiC MOSFET. I have just re-prototyped one of my wide input range flybacks, and the results are excellent. The performance is comparable to the one with the 1700V C2M Cree part, but the converter's structure is much simpler, which is good for reliability. Thanks, James. Best regards, Piotr


4500 volt mosfet

Started by Anonymous in sci.electronics.design5 months ago 6 replies

https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?s=N4IgTCBcDaIJYA8AuSAMYB2IC 6BfIA Rds_on is < 625 ohms! More like a...

https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?s=N4IgTCBcDaIJYA8AuSAMYB2IC 6BfIA Rds_on is < 625 ohms! More like a tube! It sure Spices nice. https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1 -- John Larkin Highland Technology, Inc The best designs are necessarily accidental.


why do they do this?

Started by John Larkin in sci.electronics.design2 years ago 132 replies

ST makes a nice little LDO, super-low dropout with an aux Vbias supply. Saves me from rolling my own with an opamp and a mosfet. It's an...

ST makes a nice little LDO, super-low dropout with an aux Vbias supply. Saves me from rolling my own with an opamp and a mosfet. It's an ST1L08. So why is the data sheet file en.DM00123507.pdf ? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


interesting fets

Started by John Larkin in sci.electronics.design4 years ago 8 replies

http://www.transphormusa.com/ Their part is a low-voltage enhancement mosfet cascoded with a depletion-mode GaN HV fet. -- John...

http://www.transphormusa.com/ Their part is a low-voltage enhancement mosfet cascoded with a depletion-mode GaN HV fet. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


Hall rotary encoder tempco--wisdom?

Started by Phil Hobbs in sci.electronics.design8 years ago 69 replies

Hi, all, I don't have much to contribute to the LCR MOSFET argument except possibly some ethological insight: . But I digress. I'm...

Hi, all, I don't have much to contribute to the LCR MOSFET argument except possibly some ethological insight: . But I digress. I'm on a trip to SoCal to debug the pre-production models of my spectrometer. The SNR is pretty good, way over 60 dB (which is good for a SWIR spectrometer). Looks like the last re


Gate resistor for lateral power MOSFET?

Started by Frank Miles in sci.electronics.design5 years ago 26 replies

I'm designing a power amplifier using some Exicon lateral MOSFETs as the final common-source stage. These will be used in various experimental...

I'm designing a power amplifier using some Exicon lateral MOSFETs as the final common-source stage. These will be used in various experimental systems. Each only needs to run around +/-50V out, up to 4A, and driving sinusoidally between 50 and 400kHz. The load can be approximated as a lossy series LC circuit, driven near resonance with R generally 10-20 ohms. There's an additional > 200


power dissipation in LT Spice

Started by John Larkin in sci.electronics.design9 years ago 31 replies

If I have a mosfet with grounded source that's driving some load to V+, switching the load low side to ground pulsewise, is there some simple way...

If I have a mosfet with grounded source that's driving some load to V+, switching the load low side to ground pulsewise, is there some simple way to calculate the fet's power dissipation? I could measure the voltage and current and multiply-integrate with "analog" components, or do the equivalent with math expressions, but I was wondering if anything like that was built in. Looking at the L...


Inverter H bridge question

Started by Daku in sci.electronics.design10 years ago 25 replies

Could some electronics guru please help ? I was running a SPICE simulation of an H bridge for an inverter, with 12 V DC input. The H bridge has...

Could some electronics guru please help ? I was running a SPICE simulation of an H bridge for an inverter, with 12 V DC input. The H bridge has PMOS on the high side and NMOS on the ground side. The switching works fine, and the output waveform looks exactly as it should, except that the amplitude is in the milliVolt range. I have adjusted the MOSFET sizes but that has not been very helpful. ...


MOSFETs with gate-drive specs below 1.8 volts

Started by Winfield Hill in sci.electronics.design3 years ago 56 replies

Hello y'all, Have any of you run across any power MOSFET types with gate-drive specs below 1.8 volts? -- Thanks, - Win

Hello y'all, Have any of you run across any power MOSFET types with gate-drive specs below 1.8 volts? -- Thanks, - Win


weirdly behaving mosfet

Started by Lasse Langwadt Christensen in sci.electronics.design4 years ago 24 replies

any guesses what is going on? https://youtu.be/3TmHxySwczc for those who don't want to watch the video IPB107N20N3 as a low side switch...

any guesses what is going on? https://youtu.be/3TmHxySwczc for those who don't want to watch the video IPB107N20N3 as a low side switch for a 12v lamp, 10k gate pull-down, a dual lab supply for the 12V and the gate after the fet has been ON it no longer turns OFF by dropping the gate voltage to zero, it stay ON at a few hundred mA and cooks itself think it is unlikely it is a f...


another thermal thing

Started by John Larkin in sci.electronics.design6 years ago 38 replies

https://dl.dropboxusercontent.com/u/53724080/Thermal/D2PAK_FR4.JPG I'd like to dissipate 40 watts from a D2PAK. This little experiment...

https://dl.dropboxusercontent.com/u/53724080/Thermal/D2PAK_FR4.JPG I'd like to dissipate 40 watts from a D2PAK. This little experiment has no vias, and the copper thickness is 1 oz. All the thermal conduction is through the epoxy-glass. Theta is measured from the fet to the aluminum plate. The topside copper is hot near the mosfet but drops off rapidly, so thicker copper would really ...


micropower boost circuit idea

Started by bitrex in sci.electronics.design8 years ago 2 replies

http://i.imgur.com/WameQtr.png As shown, starts up from ~0.75 volts and can provide several mA into a load, output tracking the full ~15...

http://i.imgur.com/WameQtr.png As shown, starts up from ~0.75 volts and can provide several mA into a load, output tracking the full ~15 volts above the input voltage once the input comes above 1 volt. With a logic-level MOSFET for M1 and a germanium transistor for Q1, it would probably start significantly lower. The comparator and regulator don't have to be the expensive LT parts, t...


Little 1:10 audio transformer as HV transformer

Started by Jan Panteltje in sci.electronics.design10 years ago 125 replies

Little 1:10 audio transformer as HV transformer Thse are small transformers with a ferrite core, specified as 6H secundair, and turns ratio...

Little 1:10 audio transformer as HV transformer Thse are small transformers with a ferrite core, specified as 6H secundair, and turns ratio 1:10. (conrad nr 516260). The idea was to make 400 V from 5 V with a PIC. That requires at least 40V peak primary. I tried some BC547B, but changed to a IRLZ434N MOSFET, as this one has the reverse diode for free, I tried many frequencies and pulse w...


Overvoltage protection

Started by Piotrne in sci.electronics.design9 years ago 28 replies

Hi, I have a question about controlling a large current in an experimental welder. The welder should generate a short pulse of current,...

Hi, I have a question about controlling a large current in an experimental welder. The welder should generate a short pulse of current, about 50 ms long. Additionally, it has to be regulated with a simple PWM. Now, I have following circuit: ATMega32 microcontroller which generates the PWM signal (2 kHz square wave, turned on for 50 ms); then an optocoupler; then a MOSFET driver IRS2001 d...


MOSFET Question (Buzzer, Motor Drive, LED Driver) - Advice.

Started by Anonymous in sci.electronics.design6 years ago 1 reply

Hello everyone I hope you are having a good day. I had three questions that correspond to the 3 sections of the schematic shown below. ...

Hello everyone I hope you are having a good day. I had three questions that correspond to the 3 sections of the schematic shown below. Question 1.) There is a piezoelectric buzzer that is shown below that gets connected to a microcontroller through resistors R9 and R10. Here is the part: http://www.digikey.com/product-s... Usually on a beeper I would just apply power


Low Threshold MOSFET

Started by rickman in sci.electronics.design5 years ago 34 replies

I was looking to order some low current MOSFETs and realized all the popular items had thresholds of 3 volts and higher. I would like to use...

I was looking to order some low current MOSFETs and realized all the popular items had thresholds of 3 volts and higher. I would like to use something that turns on pretty well at 3 volts so it won't need a 5 volt PSU. Any suggestions? I'm looking for a TO-92 case preferably but surface mount will be ok too. I could have sworn some years ago I tracked down a number of low threshold...


EPC2038 GaN fets

Started by John Larkin in sci.electronics.design4 years ago 23 replies

These are really tiny. That's an 0603 resistor on the right https://www.dropbox.com/s/htgdga299yjqvi2/EPC2038.jpg?raw=1 This is the...

These are really tiny. That's an 0603 resistor on the right https://www.dropbox.com/s/htgdga299yjqvi2/EPC2038.jpg?raw=1 This is the smallest of the EPC parts. Most are for power switchers, but this one has low enough capacitances that it might be useful in signal apps. 7 pF Cin is OK, but the 0.02 pF Cdg is something that no mosfet can touch. https://epc-co.com/epc/Products/eGaNFET...


H-bridge IC

Started by Winfield Hill in sci.electronics.design6 years ago 11 replies

I'm looking for a small, inexpensive H-bridge, or full-bridge IC, including MOSFET switches, for a forward-converter application. (My old...

I'm looking for a small, inexpensive H-bridge, or full-bridge IC, including MOSFET switches, for a forward-converter application. (My old favorite HIP4080 series has 20 pins and requires external FETs.) Most of the ICs with internal switches that I've found are meant for driving motors, and seem to have slow switching speeds. 40 volts and 2 amps are my minimum requirements. The LMD18200 ...


PWM- what parts do I need?

Started by J oops in sci.electronics.design10 years ago 3 replies

My goal is to build a PWM that I can control with a pot that will give me as close to 100% duty cycle and be able to handle 100A continously. I'm...

My goal is to build a PWM that I can control with a pot that will give me as close to 100% duty cycle and be able to handle 100A continously. I'm not that smart with the electronics. I've played around with different set ups using a 555chip. I've been doing a little research on Half-bridge Power Mosfet drivers (A3946) and 100A N-channel Mosfets. I think I have the pulse width modulation part f...


Driving laser diodes

Started by Cursitor Doom in sci.electronics.design6 years ago 37 replies

So anyway, I got one of those blue laser diodes that Jan featured on here recently. It hasn't arrived yet and I don't have a spec sheet, but I'm...

So anyway, I got one of those blue laser diodes that Jan featured on here recently. It hasn't arrived yet and I don't have a spec sheet, but I'm thinking how simply it could be driven if I adopted a minimalist approach. Say it draws (plucking a figure out of thin air) 2.5A at full power. Is there any reason I shouldn't just rely on the current limiting provided by a MOSFET with a resis...