four-quadrant smps, LT8714

Started by Winfield Hill in sci.electronics.design6 years ago 14 replies

fun and games at Linear Technology! not exactly a SEPIC, how do they do it? bipolar output V and I, seamless through 0V, 0A. interesting...

fun and games at Linear Technology! not exactly a SEPIC, how do they do it? bipolar output V and I, seamless through 0V, 0A. interesting app: high-power TEC driver. web page http://www.linear.com/product/LT8714 LTspice http://www.linear.com/docs/47512 -- Thanks, - Win


Series Connect Lab SM Power Supplies

Started by Larry Underwood in sci.electronics.design10 years ago 57 replies

I need a variable bench supply that will provide 0-32VDC at 30A. I already have two of these inexpensive (0-16VDC 30A) units. Please see link...

I need a variable bench supply that will provide 0-32VDC at 30A. I already have two of these inexpensive (0-16VDC 30A) units. Please see link below for full specs: http://www.jaycar.com.au/productView.asp?ID=MP3802&form=CAT2&SUBCATID=999#12 I have heard SMPS's can be operated in series if a diode in placed across the connected positive and negative leads to prevent one from loading the o...


Thermals on ceramic caps in SMPS

Started by Andrew Holme in sci.electronics.design6 years ago 9 replies

I'm re-spinning a board with two switching regulators on it: one using Linear's LTC3810, the other using Micrel's MIC28304. The manufacturers'...

I'm re-spinning a board with two switching regulators on it: one using Linear's LTC3810, the other using Micrel's MIC28304. The manufacturers' demo boards and recommended layouts for these devices do not have thermals on ceramic caps which handle high rms currents. The pads for these caps are openings in the solder mask over large, continuous copper planes. The caps are 1210 size


Type 2 compensation network design

Started by Bitrex in sci.electronics.design10 years ago 3 replies

I'm working through the excellent text on SMPS design "Switching Power Supplies A to Z", by Sanjaya Maniktala. Right now I'm reading the section...

I'm working through the excellent text on SMPS design "Switching Power Supplies A to Z", by Sanjaya Maniktala. Right now I'm reading the section on the feedback loop and stabilization. As a first-order rule of thumb to achieve stability, Mr. Maniktala suggests that the loop gain transfer function of the switcher intersect the 0 dB point at approximately 1/6th the switching frequency, with a s...


Counting photons with an MPPC

Started by Phil Hobbs in sci.electronics.design2 years ago 62 replies

Well, the MPPC demo system is done. It has four of our small proprietary boards (controller/SMPS, TEC driver, voltage-controlled amplifier,...

Well, the MPPC demo system is done. It has four of our small proprietary boards (controller/SMPS, TEC driver, voltage-controlled amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end and a box of voltage regulators. Works from single photons up to about 4 mA in one range. This video shows it counting photons, which I still think is a cool thing to be able to do. ...


Electros in Series II

Started by Phil Allison in sci.electronics.design2 years ago 28 replies

Hi, just came across a Chinese made powered mixer with Class D amps and SMPS. Branded Fender model "Passport 150 Pro". The 4AT 20mm...

Hi, just came across a Chinese made powered mixer with Class D amps and SMPS. Branded Fender model "Passport 150 Pro". The 4AT 20mm AC fuse was blown and a replacement blew spectacularly at about 90VAC input. Plus a little smoke appeared.... Standard, twin voltage input for 120/240 - set to 240V. The smoke came from a pair of exploded "TVR" 14mm dia varistors connected across ea...


High eff. automotive buck SMPS chip?

Started by Anonymous in sci.electronics.design8 years ago 8 replies

Howdy, I'm trying to save some heat in an existing product, automotive application. Anyone have a fave buck synch. switcher, Joerg-cheap? ...

Howdy, I'm trying to save some heat in an existing product, automotive application. Anyone have a fave buck synch. switcher, Joerg-cheap? Vin: +12-28v Vout: +5v Iout: 4-5A n: > =90%


RF Quiet Wall warts

Started by Martin Riddle in sci.electronics.design4 years ago 59 replies

It's been a year or two since I listend to AM Radio, and in that time theres a new Roku box and linksys router. Well, I couldn't hear anything ...

It's been a year or two since I listend to AM Radio, and in that time theres a new Roku box and linksys router. Well, I couldn't hear anything on the AM band when I checked a week ago. So the quest was to find the culprits. Its these SMPS wall warts, they literly wipe out the entire AM band, and also some chinese LED lights( 15w equiv Grimaldi's ). Tossing the led lights are easy, the wall...


Using a microcontroller input as crude comparator (threshold variation effects)

Started by Klaus Kragelund in sci.electronics.design9 years ago 19 replies

Hi I am working on a current mode controlled SMPS. I have a sawtooth voltage r= amp (measured current in a sense resistor) and I would like...

Hi I am working on a current mode controlled SMPS. I have a sawtooth voltage r= amp (measured current in a sense resistor) and I would like use a digital i= nput pin of a micrcontroller to turn off the PWM that controls the ramp. Th= e ramp moves from 0 to 100mV in 10us.=20 I do not have a free comparator on the micro, so I thought of using the dig= ital input threshold as the fast level...


Current State of ASIC, do or dont

Started by Klaus Kragelund in sci.electronics.design7 years ago 49 replies

Hi We have a very high volume circuit, used in several product, about 1mill pcs per year. Another more complex circuit go at 100k pcs per...

Hi We have a very high volume circuit, used in several product, about 1mill pcs per year. Another more complex circuit go at 100k pcs per year The circuit is a mix of digital functions, small signal transistors, some high voltage stuff ( < 30V) and PWM controllers for SMPS I need some input to how the ASIC marked is today: 1. NRE costs 2. What is relevant to implement into an ASIC 3.


ESD problem on SMPS

Started by Anonymous in sci.electronics.design9 years ago 18 replies

I'm using an Aimtec AMEL20-515DMAZ in a product...

I'm using an Aimtec AMEL20-515DMAZ in a product (http://www.aimtec.com/amel= 20-515dmaz-18w-120-370vdcv-90-264vacv-input-voltage-5v-15v-output-voltage-0= v-isolation-encapsulated-dc-dc-isolated-power-supply) Without going into too much unnecessary detail right now, some ESD events c= ause the supply to drop its 5V output for as much as 100ms. It always reco= vers, but that is bad for micro...


Inrush current-limiting

Started by Anonymous in sci.electronics.design4 years ago 72 replies

Is there something better than a PTC thermistor for limiting the line-current inrush to a conventional bridge-> cap SMPS front-end? (I'm...

Is there something better than a PTC thermistor for limiting the line-current inrush to a conventional bridge-> cap SMPS front-end? (I'm charging 15uF from the 120VAC line, so the inrush will stress parts and pit switch contacts if you energize the switch just when the line voltage hits peak.) I never liked the PTC scheme--it seems you could fool it by cycling power after it's already wa


Removing voltage-multiplier-related flyback SMPS switching glitches

Started by Anonymous in sci.electronics.design5 years ago 13 replies

A problem encountered with medium-to-fast current-mode flyback switchers, when combining high-ratio multi-winding flyback inductors with...

A problem encountered with medium-to-fast current-mode flyback switchers, when combining high-ratio multi-winding flyback inductors with multipliers: When Q1 switches on, a large current surge flows as Cpump charges from Cmult1 via D2. At Q1, the surge magnitude is multiplied by the transformer ratio. On simulation, U1 senses this via Rs and cuts Q1 off instantly, crippling the switcher -- ...


new 30MHz to 300MHz switcher - worlds smallest laptop adapter

Started by Jamie M in sci.electronics.design8 years ago 64 replies

Hi, Here's a new SMPS switcher apparently coming out next year for...

Hi, Here's a new SMPS switcher apparently coming out next year for laptops: http://phys.org/news/2013-12-circuit-laptop-charger-brick.html It apparently has a "power reclaiming scheme" for higher efficiency, would this be conventional sync rectification or some other thing? It looks like power electronics is in for a big (r)evolution once the 300MHz+ designs start to spread! cheer...


Re-calibrating bench PSU

Started by bitrex in sci.electronics.design1 year ago 11 replies

I need another PSU on my bench and I remembered I had this thing in my junk closet, a SMPS-based supply from www.mpje.com. Something was...

I need another PSU on my bench and I remembered I had this thing in my junk closet, a SMPS-based supply from www.mpje.com. Something was wrong with it I couldn't remember but all I recalled was this is what the power PCB looked like, from the "factory" mind you:


[JOB POSTING] Sought: FPGA PCB Design for Europe Electronics Company

Started by Anonymous in sci.electronics.design7 years ago

We are searching for a freelance PCB designer that is familiar with FPGA, DDR3, LVDS, SMPS, Analog-to-Digital converters, USB, PCIe, Gigabit...

We are searching for a freelance PCB designer that is familiar with FPGA, DDR3, LVDS, SMPS, Analog-to-Digital converters, USB, PCIe, Gigabit Transceivers, etc, board layout and schematic design. Has to be able to work in Altium Designer. Good learning skills are very important. Communication in written and spoken English must be very good, and has to be available online for quick re


SMPS Cuk converters

Started by Glenn in sci.electronics.design8 years ago 1 reply

Read a little about isolated Cuk converters. Why are they not used instead of Buck, boost, Buck-boost converters? They work best with CCM but...

Read a little about isolated Cuk converters. Why are they not used instead of Buck, boost, Buck-boost converters? They work best with CCM but can of cause also use DCM. The original patents are expired: http://boostbuck.com/TheFourTopologies.html The 1:1 transformer is gapless. The input/output-transformer must have a gap: http://www.boostbuck.com/IsolationoftheCukConverter.html htt...


Small SMD xformer for a forward converter with double isolation

Started by Klaus Kragelund in sci.electronics.design9 years ago 21 replies

Hi I need a small SMD transformer for a 100mW SMPS. It will be running in a single switch forward converter at about 200kHz. This pulse...

Hi I need a small SMD transformer for a 100mW SMPS. It will be running in a single switch forward converter at about 200kHz. This pulse part looks like it fits the bill: http://ww2.pulseeng.com/products/datasheets/T678.pdf But, it isn't double isolated (need working voltage isolation of 300V). Anyone have a hint to something simelar that is double isolated? Thanks Klaus


SMPS Cuk converters

Started by Glenn in sci.electronics.design8 years ago 1 reply

Read a little about isolated Cuk converters. Why are they not used instead of Buck, boost, Buck-boost converters? They work best with CCM but...

Read a little about isolated Cuk converters. Why are they not used instead of Buck, boost, Buck-boost converters? They work best with CCM but can of cause also use DCM. The original patents are expired: http://boostbuck.com/TheFourTopologies.html The 1:1 transformer is gapless. The input/output-transformer must have a gap: http://www.boostbuck.com/IsolationoftheCukConverter.html http:/...


Programmable tracking pulse supply.

Started by Winfield Hill in sci.electronics.design7 years ago 32 replies

I'm designing a programmable tracking pulse supply. This is an SMPS, with dual tracking positive and negative outputs. It must run from a 5...

I'm designing a programmable tracking pulse supply. This is an SMPS, with dual tracking positive and negative outputs. It must run from a 5 to 24V input, and deliver +/-5 to +/-50 volt outputs. A 0 to 5V input signal programs the output voltage. It's a "pulse supply," because it must deliver up to 3A, using a pair of large output capacitors. I've chosen the inverting switching m...