I2C to PWM IC

Started by Michael in sci.electronics.design7 years ago 17 replies

Does anybody make an IC that takes I2C command and outputs duty cycle (PWM)? I need to control bunch of TECs from CPU and I2C-> PWM seems the...

Does anybody make an IC that takes I2C command and outputs duty cycle (PWM)? I need to control bunch of TECs from CPU and I2C-> PWM seems the most efficient (and smallest) way to do it. Any suggestion will be appreciated. Thanks Michael


PWM controllers... shopping

Started by sea moss in sci.electronics.design2 years ago 58 replies

Seems like every time I start a new power design, I waste a bunch of time looking for the ideal PWM controller. At the end of the day I'd...

Seems like every time I start a new power design, I waste a bunch of time looking for the ideal PWM controller. At the end of the day I'd really like to have the simplest IC possible to handle just the PWM function, and I provide my own error amp, gate driver, and reference externally. The ideal part would look like this: oscillator set by resistor, comparator non-inverting input,


PWM for High-Torque Motors

Started by Cursitor Doom in sci.electronics.design1 year ago 34 replies

Gentlemen, Is it feasible to PWM a car starter motor or is there just too much reactance in them? TIA, CD

Gentlemen, Is it feasible to PWM a car starter motor or is there just too much reactance in them? TIA, CD


Measuring PWM current?

Started by Spare Change in sci.electronics.design3 years ago 30 replies

Can an RMS current clamp meter accurately measure the current of a PWM voltage? How else to measure PWM current without a shunt or direct...

Can an RMS current clamp meter accurately measure the current of a PWM voltage? How else to measure PWM current without a shunt or direct in-line meter? Thanks.


Wanted: Voltage mode PWM controller

Started by powerampfreak in sci.electronics.design14 years ago 18 replies

Hi all. I need a basic voltage mode PWM controller for a buck converter project. I need a wide duty cycle range, like 5 - 95%. I don't need an...

Hi all. I need a basic voltage mode PWM controller for a buck converter project. I need a wide duty cycle range, like 5 - 95%. I don't need an error-amp in the ic, since this part is placed elsewhere in my circuit. So, a basic Ramp generator and a PWM comparator, and an output stage. An UC3843 would suit if it were voltage controlled instead of current. I've gone through Fairchild, ONsemi we...


RIsense Value for Basso's PWM-CM Model

Started by Anand P. Paralkar in sci.electronics.design8 years ago

Hello, I am trying to simulate a buck and a boost converter using Christophe Basso's generic PWM models (in LTSpice) for voltage mode...

Hello, I am trying to simulate a buck and a boost converter using Christophe Basso's generic PWM models (in LTSpice) for voltage mode controlled and current mode controlled switched mode power supplies. These models have an integrated PWM generator and power switch. These models can be found here: http://cbasso.pagesperso-orange.fr/Downloads/IsSpice/Final%20models.zip (alternati...


PWM Sine Wave Inverter output problem

Started by Myauk in sci.electronics.design11 years ago 3 replies

Dear All, I am building a PWM Sine Wave Inverter using H-Bridge IGBT Configuration. The inverter has the following stages: 1. A Sine Wave...

Dear All, I am building a PWM Sine Wave Inverter using H-Bridge IGBT Configuration. The inverter has the following stages: 1. A Sine Wave Oscillator 2. An unity gain inverting amplifier to generate inverted sine wave 3. A Triangular wave generator 4. Two Sets of Comparators to generate PWM waveform for positive and negative cycles 5. Two Half Bridge IGBT Drivers to generate A and A' s...


The x-Chapters: A missing topic!

Started by olaf in sci.electronics.design3 years ago 2 replies

I am just reading the first page of the "The x-Chapters" When I read the line: "PWM for dc motors - a myth demolished" a thought pop out of...

I am just reading the first page of the "The x-Chapters" When I read the line: "PWM for dc motors - a myth demolished" a thought pop out of my brain: There is something missing: The peltier element - how to avoid PWM and ripple. Fun with PIR sensors - what you should do and what not. The LM741 - please dont use it anymore. :-) Any other ideas for topics we realy need? Olaf ...


Fairy Lights PWM Part 2

Started by Tim Watts in sci.electronics.design3 years ago 15 replies

Follow up from the thread Oct 2019 Minimising EM noise from PWM switched fairly lights? Hi folks, Recap - this is an educational project...

Follow up from the thread Oct 2019 Minimising EM noise from PWM switched fairly lights? Hi folks, Recap - this is an educational project for my son to drive some existing garden LED fairy lights from a Raspberry Pi ZeroW The only problem, as fully expected, is they are chucking out more EMI than I'd like and I don't want to be causing problems for others. So - yes, it's a crappy co...


LED drivers, >24V, 20-30A current reg, fast PWM

Started by Winfield Hill in sci.electronics.design3 years ago 7 replies

What are some good switching-mode LED drivers, able to work > 26V, regulate current at 30A (ext FETs), and do fast PWM for 3000:1 or...

What are some good switching-mode LED drivers, able to work > 26V, regulate current at 30A (ext FETs), and do fast PWM for 3000:1 or better dimming? We looked at MAX16819, what are some others you like? -- Thanks, - Win


Pulse-powered current limiter

Started by Piotr Wyderski in sci.electronics.design7 months ago 23 replies

Hi, I am experimenting with white LED COBs and wanted to power them from a constant current source while still having the PWM dimming...

Hi, I am experimenting with white LED COBs and wanted to power them from a constant current source while still having the PWM dimming capability. The current limiter should be located next to the diode and the lamp "interface" should be regular two wires. In other words, the current limiter should be capable of being powered from a +12V/open drain source with the PWM frequency of ~400H...


Motor controller

Started by en2 in sci.electronics.design8 years ago 7 replies
PWM

Hi ! I was planning on creating one motor controller for my crystalyte motor. Its three phase 1,5kw blcd motor. Can someone share ideas on...

Hi ! I was planning on creating one motor controller for my crystalyte motor. Its three phase 1,5kw blcd motor. Can someone share ideas on pwm design and or basic schematics ?


MPS430 cordicPWM sine wave generator

Started by miso in sci.electronics.design10 years ago 18 replies
PWM

The eval kit is a whole $4.30 including shipping, and it comes 2nd day Fedex. > ...

The eval kit is a whole $4.30 including shipping, and it comes 2nd day Fedex. > http://e2e.ti.com/group/microcontrollerprojects/m/msp430microcontrollerprojects/609573.aspx The person coded the cordic, and then implemented the sine wave with PWM.


GHz oscillator

Started by John Larkin in sci.electronics.design1 year ago 55 replies

What's a good way to make a, say 2 or 3 GHz sinewave oscillator? I don't need extreme accuracy, and I'd like maybe 1 volt p-p. I was thinking...

What's a good way to make a, say 2 or 3 GHz sinewave oscillator? I don't need extreme accuracy, and I'd like maybe 1 volt p-p. I was thinking a cheap MMIC with PCB delay line feedback. MiniCircuits VCOs are around $20, which isn't bad. The output would go into a PWM modulator and then an AC-coupled communications channel.


TI deadtime generator

Started by Piotr Wyderski in sci.electronics.design3 years ago 11 replies

It seems they took Win's circuit way too...

It seems they took Win's circuit way too carelessly: https://e2e.ti.com/blogs_/b/powerhouse/archive/2015/09/10/control-a-gan-half-bridge-power-stage- with-a-single-pwm-signal According to the schematic, they use SN75LVC2G14 as the Schmitt trigger. The datasheet says V_T+ is 2.2--3.7V (@5.5V), while V_T- is 1.4--2.5V and deltaV_T is 0.7--1.4V. This would be good enough for *some* deadtime i


Slowing solenoid action?

Started by Terry Pinnell in sci.electronics.design3 years ago 33 replies

Is it possible, perhaps using PWM, to slow down the action of a solenoid while still maintaining most of its force? By way of background, I'm...

Is it possible, perhaps using PWM, to slow down the action of a solenoid while still maintaining most of its force? By way of background, I'm considering a solenoid for pressing a rather firm button. The only one I have at present that can do so reliably is a 24V type that delivers its press too fast and too noisily. Lower voltage types (already owned or researched on ebay or Amazon) seem t...


dc/dc converter ckt

Started by John Larkin in sci.electronics.design4 months ago 16 replies

I'm designing another 3-phase PM alternator simulator, and I need a roughly +-60 volt floating power supply. It will feed three PWM half-bridges...

I'm designing another 3-phase PM alternator simulator, and I need a roughly +-60 volt floating power supply. It will feed three PWM half-bridges to make the three output phases. Here's my first pass at the dc/dc thing. https://www.dropbox.com/s/bwt1vgbb2j94p1d/23S942_x1.jpg?raw=1 Those Coilcraft planar transformers are radical. 300 watts, surface mount, under a cubic inch. They have a ...


Minimising EM noise from PWM switched fairly lights?

Started by Tim Watts in sci.electronics.design3 years ago 48 replies

Hi, This year's project is to drive 3 strings of 30V DC LED outdoor fairy lights from Raspberry Pi's[1] I've been on here before last...

Hi, This year's project is to drive 3 strings of 30V DC LED outdoor fairy lights from Raspberry Pi's[1] I've been on here before last year and took some greet advice with respect to H-Bridges and found some, along with DC-DC converters that will enable me to interface a 30V DC supply to the Pi and the Pi back to the lights. The only thing I am mindful of is not to inadvertantl...


UC3825 help with Pspice

Started by Waldes in sci.electronics.design14 years ago 1 reply

Hi all! I need simulation file for this IC. If someone has it, please share with me. I found here some files for UC3843, UC3842, but they...

Hi all! I need simulation file for this IC. If someone has it, please share with me. I found here some files for UC3843, UC3842, but they are current mode, and I want something with voltage mode for flyback converter, which has voltage regulated from 30V to 300V. So I will be gratefull for model UC3825 or information how to simulate in Pspice PWM modulator with Soft Start and limit max cur...


Attainable PWM accuracy?

Started by Phil Hobbs in sci.electronics.design3 years ago 84 replies

Hi, all, As part of the aforementioned cathodolumiescence system, I'm doing a bias supply for multipixel photon counters (MPPCs). MPPCs...

Hi, all, As part of the aforementioned cathodolumiescence system, I'm doing a bias supply for multipixel photon counters (MPPCs). MPPCs are extremely voltage sensitive--the gain of this one goes from ~0 to 2E6 between 52 and 55 volts' bias. (See .) Sooo, there's a bit of pressure to keep the bias very stab