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131 Threads found on edaboard.com: And 48v

UC3842 flyback 48V - 12V 3A output voltage drop problem

I have a friend who recently asked Texas about a divergence on the theoretical calculation of the maxumum allowed currentxtemperature when compared to the result of that tool, and the answer he got from technical support is that there was indeed a problem with the tool and that it would be solved soon. It might be interesting to use the schematic g

UC3842 flyback 48V - 12V 3A output voltage drop problem

Hello, I'm new to power electronics and analog design. I have designed my flyback converter using WEBENCH, and i have the problem of dropping output voltage drastically. The purpose of my design is to supply some rare electronic devices in telecomunication. DC input: 35 - 60V DC output: 12.1V - 3.1A My practical transformer: Lpri = 66.3

Remote sensing for high current power supply

We have just done a 1V5, 65A output (vin=48v) power supply using a Vicor PRM48__VTM48 module cascade. We are using remote sensing because of the volt drop through the high current trace to the load (processors). As you know, the presence of this stray trace resistance , and the output capacitors means that there is an RC filter in the power stage

I need your help in one SMPS problem

Maybe there is a problem on the feedback line( at the low voltage between optoccupier and tl431

Vicor SMPS module external error amplifier transfer function?

This concerns the attached schematic of a 48v to 1V5 SMPS which uses Vicor power modules. Do you agree that the Error Amplifier small signal transfer function should feature a ?divide by 24? factor? -and that this must be done so as to take into account the fact that the output voltage is sensed at the 1V5 rail rather than from the intermediate 36

Ground separation resistor not necessary in SMPS?

Hello, Would you say that the 10R (0603 size) resistor in the grey shaded ?bubble? is unnecessary? (PDF schematic of 48v to 1V5 at 65A SMPS attached) The component ?MOD2? is an electronic transformer with isolation between its input and output?however, we don?t actually need isolation. The 10R resistor was originally thought of as being neces

Choice of topology and design for power supply

I need to design Power supply: input 85-265V AC 50/60Hz output: +5V (200mW-8W), +24V(1W-80W), +48v(1W-140W) output power min 200mW max 150W ( step change on +24 and +48v ) Build in , without air flow high efficiency, long life, accuracy on +5V +-2% How to choose the topology and design? It has the choice at (...)

[moved] 48v phantom power switching ( multichannel )

You are trying to design a high-side or "source" driver. UDN2981 or 2984 is a single chip solution for the problem. A discrete solution would use high-side PNP respectively PMOS switches and a level shifter circuit to control it by ground referenced 5V logic. E.g. a NPN transistor and a few resistors.

ammeter for microcontrollers

Hello, If someone can help with this problem. I have dc power supply that powers LED. Output is 48v when LEDs are turned on and current is 800mA. I want to measure the current so I can know if LEDs are working or not. If LEDs are broken and not working then voltage at output is 100V and current is 0. This data I (...)

LLC resonant Half Bridge converter for low power, low voltage SMPS?

Hello, We are designing a 20W SMPS which simply supplies 15V at 1A to an RF Phased array antenna circuit. (its for comms). Vin = 48v. We were wondering if it is overly extravagant to do this as an Half-Bridge LLC converter? Its just that the SMPS will be very close to the Comms signal processors and other sensitive circuitry, so we wondered sh

Non Isolated Buck Converter Vin_min=48V and Dual Output Vout=+/-12V

Hello folks! I am wondering if someone can give a comercial part of a buck converter with the next features: Vin_min = 48v. Vout= +/-12V I found some isolated power converters from Traco Power. But i need a NON isolated Sw Regulator. and I am not able to find anything which fits with that... Thanks in advance.

[MOVED] ferrite core transformer maximum frequency response without loss

No way of knowing unless the topology and the operating voltage is known. Maximum frequency with out any loss at all is zero Hz.

Power over Ethernet connector selection and connection ?

IEEE 802.3 2012, Clause 33 is describing two alternative schemes for implementing PoE with 10/100 Mbit twisted pair connections 124046 See also: Compliant PSE has to check the load condition to avoid damaging standard non-PoE aware equipment, which may involve a co

[moved] high power 24-48V pulse generator fm 12V bat'y

Hello everyone, I need to make 24 to 48 volts; 3 amp maximum from a 12 volt battery. Variable frequency Thanks for helping up you cannot design a circuit without specs. What exact device or output impedance vs frequency and V(t) supposed to look like. e.g. rise time, PW50 pulse width, tail time? What does I(

Line transient protection, cascade DC/DC converters

Hello everybody, I?m designing a circuit (the power part in the attached file) that requires both 3.3V and 15 V supply. I?m not so expert in powers electronic so I?m asking your help. I?m using 2 Traco Power DC/DC converters (2W models: TES 2N-4813 (from 48v to 15V) and TES 2N-1210(from 15V to 3.3V)

current limiter for 48v supply ( 50ma )

Hi I made this power DC - DC convertor form this design, 122089 Its maxamum power output is supposed to be 50ma but it seams to be able to supply more and start to cook some of the components if you draw more !! no current limiter I assume ? So I was thinking I could add a current limiter? does anyone know a good w

A problem with lm2576HVS and 48v

I don't see a LM2576HV specification requiring a minimal load, particularly no hint that the device may be damaged without it. As far as I rmemember, I have used other "simple switcher" ICs with no load. My first guess would be that you got a faked LM2576HV which is actually standard LM2576. Another explanation is that you have a large series

LED driver LM317 schematic

Depends greatly on your heatsink thermal resistance how much current and heat rise to say 70'C I succesfully use 4S on 12V on AWG18 with 30AWG drops for Rs equalization of 0.1Ohm or 6S on 18 or 19V or 8S on 24V or 24S on 48v. So no loss on regulator and adjust supply drop with long wire suitable guage for 100% voltage matched between (...)

My Clap Switch is not working

I see this more and more, new users with one or two postings looking for answers. Once they are helped, they do the vanishing act.

Standard Low voltage DC bus voltage for solar panel outputs?

48v is the standard low voltage for kW sized arrays, but there is nothing stop Utilites from cascading banks of arrays into larger serial, Parallel grids for MW and GW sized farms with suitable protection.

Toroidal winding calculation

Hello all I would like to design my own toroidal 48v - 25A transformer. I need to have a design formula and calculation. Can any body help me and direct me to do.... Thanks

C,N,O vs Freq and Z,R,X vs Freq for Common Mode Choke on -48V power bus.

We are currently using a common mode choke to provide EMI control of a -48v bus feeding telecom circuitry. We have to use an alternate common mode choke due to availability. Looking at the datasheets, the impedance plot of common, normal, open vs. frequency is compatible from DC to 10GHz. However, a second plot of Z, R, and X is not as good.

Choosing a transistor for high power LED application

If the LEDs are in series and use 48v at 1A then a transistor cannot be used because it will need 100mA at its base to fully saturate. The Arduino can supply only 25mA. Use a logic-level Mosfet to switch the power supply to the LEDs modulated by the PWM.

ADC - Voltage measurement on negative voltages

Another option is supply both +Vref and -Vref of A/D converter with external voltages taken from +48v/-48v battery bank ( e.g. -5v/+5v ), so that can determine precisely the drift from GND, which is the half of full scale references of the analog to digital converter.

Power supply failure after a few months??????

One of the reason can be capacitors in supply line, C2 and C5. As these are normal ceramic capacitors, due to mechanical stress on PCB time to time, these capacitors breaks and get shorted and short current flows which damage DC-DC but rest circuit remains unaffected like your case. Solution: First of all, Please check rating of these (...)

(Synchronous) Buck converter using SG3525

It happens to have some SG3525 available and I need to quickly build a buck converter (48v -> 12V). Reading the datasheet, seems like there's no way to control a synchronous buck converter (since the outputs are not complementary). It could be done by putting both outputs in parallel then using an CMOS inverter for the complementary output.

What is switchiing regulator for negative voltage (Same as Lm2576)

Hi , Friends What is switching regulator for negative voltage I need part number same as lm2576 but for negative Voltage also i need 3 ampere in output . There is -48 VDc and i should , change to - 12 VDC. thanks

H-Bridge, N Mosfets and the like...

Hello to everyone. I don't know if this is the correct subforum for my question, but its for a hobby project of mine so it will have to do!! I want to make a (dual) H-bridge to control DC motors. I don't know yet which motors, but they will be 24V or 36V (or maybe 48v). I'm getting fed up with the costs and poor performance of suitable P-m

How to to drive P-Channel MOSFET at high side in 48V rail ?

Use a buffer (e.g. complementary emitter follower) between Z-diode and gate.

H-Bridge Driver With N-Channel MOSFETs/IGBT

I hope this circuit is ok for uMOS/IGBT H-bridge driver. My device is dual IGBT. 110883 I will be using it to drive 24V and 48v power Inverter. 110884110885 Please if the Cap for the bootstrap is under/over-ratted, I want to be corrected Thanks.

48V PWM Inverter With MOSFET Switch

If you have a 220V heater, connect it in series with +48v and transformer power input. This will limit current and stop fireworks and let you take further measuements.

Switched mode buck led driver ic with external 11V bias supply into Vin pin?

Vin is the power input, not a bias input and This is a Boost regulator with Buck PWM on the low side. 48v is the output not vin. Expect that your input current will be 125% x Iout * Vo/Vin e.g. if 48v, 500mA out , Iin=2.73A

Need off-the-shelf 500W PSU with schematic and bill of materials also available to us

Hello, We are going to use the Meanwell HRPG-600-48 PSU (48v, 13A, Offline) to power our four 105W Buck LED drivers. (Iout=3A, Vout = 35V, fsw = 200KHz, CCM, non-synchronised) All the four LED drivers, when considered together, only have 80uF of input capacitance, due to PCB room constraints. Therefore, as you can imagine, most of the rippl

Boost Converter upto 5KW output: 310V and 18A

Hi the main purpose of this project is to complete a boost converter upto 5KW(minimum) without transformer with 310V output.If you have any idea or helpful material please share it. If you just want use boost converter ( just and just ) you must go for some boost converters in parallel ( but of course not the simple classical boost c

Negative switching Regulator

I would expect there are plenty of telecom-standard DC-DCs made to operate in a -48v system, and an isolated-output one doesn't really care where you pin the output reference ground. Right? Have you looked simply for 48v-12V isolated converters and checked whether this is viable, for a particular one?

How control feedback of LM2576 from MCU?

Hello, I have circuits with step-down LM2576HVT see picture. (power supply for inductive heater). New idea is use this circuits also as power supply for resistive heater. MCU disconnect Out 5-48v and FB (make off HF switching transistor) Left to invent, detachable feedback that output switches to Output 34V and 40V turbo mode on. (...)

i have three questions need help

1. Consider a Boost converter, ( switch and inductor ) To charge the battery in the DC rated inductor at high freq. regulated by impedance of 48v battery and filter average battery voltage to control PWM ratio ( regulator). Voltage drop ratio depends on the resistance ratio of the switch to the equivalent load resistance. Energy storage (...)

Electric Motorcycle Wiring Design

It is not an ignition switch, unless you have hidden an IC engine somewhere, its a 48v isolator. There seem to be a shortage of fuses in your block diagram. Contactors have a low contact volt drop, but a finite life and significant driving power, auxillary contacts can be fitted too provide further functions easily. Power semiconductors need to be

Regarding LM317: Not getting required output

Dear All, I am working on failure analysis of products. In one faulty module we use LM317 for 5.17 V generation. The reported problem is that the output voltage is not observed and sometimes it is observed (During vibration) After analysis it is observed output pin of LM317 is not soldered so sometimes it is get connected and sometimes it is no

Why does full bridge smps have a resistor in series with cout?

The following (attached) is a 250W full bridge smps as used by a huge Telco in a PSU. Spec is fsw=300khz, vin=48v, vout=26v,current mode, CCM , Np/Ns = 1 The main cout cap is C54 (68uF) and you can see it has resistor R37 (220mR) in series with it. Why is this resistor there.? Why would you want to decrease the ESR-Cout zero

48v battery monitor the cutoff voltage 42v

@chravi75: First of all, go and have a lunch, you're kinda eating some letters :evil: Anyhow, It's easy to make the accu protection with much smaller pic, eg. 12F615 I use it for protecting Pb sealed accus and LiIo ones, just finished some devices with 4400 mAh LiIo's. Second, this board is for publicly SHARING not just "dating" and (...)

Impedence determination of a given mic

A condenser mic needs an external 48v to bias its diaphragm. Maybe you have a more modern electret mic that is a condenser mic with the high voltage permanently set in its electret material and it has a built-in Jfet impedance reducer. Its impedance is about 3.3k ohms but the resistor that powers it is effectively in parallel so the total impedance

Lm 380 audio amplifier

You probably have an electret microphone which is a condenser mic that has the 48v permanently stored in the electret material and it has a Jfet impedance reducer inside that needs about 0.5mA through a resistor at a low voltage. There are hundreds of preamp circuits for an electret mic in Google.

High side current sensing: Rsense placement and vias.

I'm creating a basic ~90W DC/DC converter using the LM3904HV driver. Input is 48v to 60V, output is 29v to 31V @ 2.8A MAX. Regarding placement of the sense resistor, trace length to the FET gate and Drain, and vias within the sensing net: The resister is as close to the driver as practical (about 0.500" net length) but this means I'd have (...)

bi-directional DC-DC converter

Can you please give the circuit diagram.Just google "synchronous buck converter," that's your basic circuit. The selection of power components and controller design will be the real task. I would start with a lower voltage prototype (maybe 48v-12V instead of 300V-12V) just to be safe.

Tuning DC1924 and DC2009 demo boards from Linear for Buck/Boost DC/DC conversion

Linear Technologies has two interesting demo boards to manage buck/boost DC/DC conversion: DC1924 (LT8705 based): input 36-80V, output 48v/5A DC2009 (LT3791 based): input 12-58V, output 24V/5A Actually LT8705 has 3-80V input and 2-80V output and can handle up to 250W LT3791:5-60V, 2-60V, ? W I need a buck/boost (...)

High Current High voltage MPPT

Simple answer 4 batteries in series(48v) and 4 Solar panel in series.

how to design a 1KW solar power plant

Usually for higher power ratings, voltage goes up to achieve power and to decrease currents. Can be 72V, 96V,..., even I saw ove 140V systems. Look to avoid higher currents. For 1KW system can have voltage of 48v or up. Number of solar panels is not only linked with electronics calculations, its also linked with geographic location, building-

Overvoltage Protection Problem

Hey all, I am trying to design a circuit which to rectify and boost the back-emf of a 3-phase BLDC motor (on a bicycle)to charge a 48v battery. As of now, the circuit works great, it can accept input voltages ranging from 5-56V and boost them to a Vout of 56V to charge the battery. However, if the speed of the bike increses too much, (...)

Does any industry have a 100VDC power bus?

Telecom is 48v, and some applications impose voltage deratings of 2X when reliability is needed "by the book". 10V meanwhile is a discharged automotive battery. Probably just trying to cover as many apps with one design, as practical.