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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

hello experts i'm designing dc dc converter for 40kHz PWM freq. and ferrite core transformer is 250uH will it support ??

## Power over Ethernet connector selection and connection ?

hi all, i have conflict over selecting POWER OVER ETHERNET connector and connection between connector and controller. i need to send +12v and data in same RJ45 connector. i select some POE+ magnetic jack connector. but i dont know how to connect 12v and data line.if i transmit both power and data will it (...)

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

A boost converter makes it possible to step up 12V to 24-48 VDC. You can turn a mosfet on and off, to obtain pulsed output from a DC supply. What methods have you tried so far?

## 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 a 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

Hi, I am trying to get 5V DC from a 48v source with LM2576HVS. For test I used a 24V as input and all seems to be ok. Then I used 48v and in output I see 48v instead of 5V after that when I plug it to 24V I see 24 on output also. I tried with another LM2576HVS and same result! http

## LED driver LM317 schematic

Use lm317 as a constant current source for max current and add potensiometer or pwm to control brightness

## My Clap Switch is not working

I am designing a clap on clap off switch and made the connections as shown in the below schematic but that is not working. 118385 I have found this circuit here and as shown in the video it is working correctly. How do find the problem in my

## Standard Low voltage DC bus voltage for solar panel outputs?

Hello, What is the accepted standard commercial & industrial voltage bus level for solar panel outputs? Is it 12V or 24V, or something else? (That is, considering that that an 220VAC inverter is not used.)

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