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47 Threads found on edaboard.com: Not 48v
You can try out this revised circuit. This is not tested in the lab, but simulation looks promising. This was done with TINA by Designsoft. I also checked it with SIMetrix and got similar resulsts. - - - Updated - - - Here are the results between TINA and SIMetrix.
Seconds? Eh, not a catastrophic voltage over load then? Some sneak leakage/discharge path? does anything get warm/ hot? Frank
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
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 want to connect to (...)
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)
IRFP064 has a maximum Vds of 60V, which is not quite appropriate for driving an inductive load at 48v. A heating MOSFET could also be a sign of cross-conduction. Have you designed any deadtime for the PWM signals?
There might be a language problem. The microphone is not a "condenser type" and is not a "electric condenser type". Instead it must be an electret type that is a condenser mic with 48v embedded permanently in its electret material. Its power supply through the 47k resistor powers the Jfet in it. But the base-emitter voltage of the (...)
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.
The 2N5886 transistor circuit is a low current circuit using a high current transistor. It will not supply 50A. With such a small filter capacitor of only 470uF the circuit will have trouble producing 500mA. The current gain of the 2N5886 transistor is only 4 at a current much less than 50A so the 100 ohm base bias resistor will be useless for a hi
Hello dear edaboard members ; I'm really tired of getting the same error from proteus :( I have 48 to 12 V dc-dc converter pre-design(not completed to apply in real life) with UC2525 PWM regulator chip. My problem is when i am trying to drive to mosfet gates(IRFZ44N) PWM-A(pin-11) is nearly correct but PWM-B(pin-14) is about to gnd.(some 1V peak
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.
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
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
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
@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 continuing in
I have for many years used telephone wire (solid core, do not know gauge) for wiring up circuits on pad-per-hole vectorboard. If I find scrap wire during facilities work I grab it. If it's amps then I'll go to stranded heavier gauge like I get from harvesting electronics (PCs are full of nice fat power wires). Telephone wire lives at 48v so the i
You do not have a condenser mic that needs a 48v supply. Instead you have an electret mic that has the 48v built into the electret material. It needs a preamp with a gain of about 200 times but your circuit has maximum gain of about only 27.3 times. The electret mic has an output impedance of about 3.3k ohms which is parallel to the 10k res
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-
hi, I'm not sure your tester will work as a poe switch is intelligent it only send the 48v supply if the poe device replies a certain sequence. the 48v are not always present on the wires.
Dear all, I am trying to make a 48v 42A DC motor controller using PIC16F877A microcontroller. I know how to generate PWM using PIC micro. I would like to know ask you guys, what kind of electronics do I have to use to make the hardware. As I know PIC alone is not able to handle such high current. So is it ever possible to control this kind of DC m
I believe it has to do with corrosion, you would like the power line not to be a sacrificial anode on its long trip through the sometimes-wet outdoors.
Maximum wattage, indicated in datasheet is the dissipation in device not output wattage. Wattage is VxA, as you know. Now for example consider 75n75 fet, It can withstand 80 Ampere at max 75 volts. In a switching application it is passing 50 Amperes to a transformer load connected to 48v DC. Output Wattage is 48x50= 2400 watts. So you are operati
No that wont work.. LED's are matched voltage within a batch but have wide variance between batches. So your 48v string will not regulate to 350mA. There is a variance on Vthreshold as well as ESR. The brightness is not dependant on voltage variation but rather current control. Thats why.
Hello, Please could you check out this SMPS solution for driving a 48v, 350mA series LED string from Vin=10V. SCHEMATIC This requires a duty cycle of 0.8, and most PWM controllers do not offer such high duty cycle, so a UCC35705 will be used. UCC35705 DATASHEET
You know you're not supposed to touch the phone line, right? If India is like other countries, then you'll see an AC voltage (amplitude is around 48v but undefined) when the phone rings. I don't think an IC is needed for ringing, just use a buzzer - could be mechanical - and the circuits in the link below. I doubt a single-function "telephone ringe
I've had condenser mics that ran off a single AA battery. You seem to assume that supply voltage improves amplitude, but that would only be true if the preamp was not a fixed gain (it likely is) and input sound pressure level was at its maximum (it likely isn't). But at any rate, you can run CMOS inverters in a ring oscillator and drive a charge
I am not saturating the core. The current is a good triangular wave. The copper wire used for winding is 1.5mm thick. I am convinced that the heat is being generated in the core losses. So as mentioned by goldsmith, I will try using a ferrite core with either an "open bobbin" type core or a core with an "air gap" and not use a ferrite toroid.
I use this circuit in my design to get a linear 48v regulator with 83V unregulated DC input. But it does not work at all. Did you check the maximum input volts on the datasheet ? It says 40 volts maximum input, see here: 65351 This datasheet is from NSC. If you apply 83 volts as
Hi, I need a 48v power supply with 50 watt power(50W).the main voltage is 220V (rms). can you help me with schematic? the ripple is not important, larger than 10 volt with 50 hz frequency.
So for my application I am using the PT4523 DC DC (12V 20W 48v-Input Isolated DC/DC Converter) and to switch the DC DC on and off , I have used the optocoupler tclt1103. The input signal to the optocoupler is 3.3V and the limiting resistor is 1.5K from a MCU. It works fine for a while and then the DC DC stops responding. When the optocoupler is t
You are probably needing a 30 amp charger not 300 amps. Battery Charging Tutorial | Frequently Asked Questions - Battery Charging |
Hi, What should be the minimum value that should be used for common mode choke at power input. How we calculate this value. In some designs I found that designer used 1mH inuctor at current rating of 20A. In my present case, i have to design a filter at input. My input path should support 1000W@-48v. I could not find high current rated inductor wi
That's not true. Because GND is always link to earth, shell of equipments, etc, voltage should have positive or negtive.
Is it a must to use Isolated converter? No, it's not .. If there is no special reason to separate grounds between 48v-section and 5V-section, normal step-down converter should work fine .. IanP :D
You cant use 48v for TLP250.H e can have abs max 35v, Recommended 30v. 48v is above both. I know some new generation optocouplers have abs max 40v,but even this one would be not enough. Woud it be possible to have lower voltages with ur motor?
2kva at 12v is not good design it takes 167+ amp from battery, better go go for 24 -48v design
I designed a step down DC/DC voltage controller using LTC3890. I have an input voltage of 48v, and I want an output 12V, 3A, and an output 5V, 3A. However I can not get that much current. Any ideas? Please see the attahced schematics Thanks for help
thk u gentleman but i want 3kva ups circuit diagram, and 48v dc ,50amp battery charger circuit diagram ,these two device uses thyristor control and digital ic only not microcontroller. thanks
Can anyone tell me the reason that why negative 48v are given to BTS and not positive 48v
15,000W is a lot of power. Just charging the battery will take 38A at 48v for 10 hours. The first time you power the inverter it might blow up and kill you or set your home on fire or both. Why not fix your electricity instead?
Hi All, I am going to design a buck conveter. 48v to 3.3V@5A Is there any design document for that not only for the above spec, in general? Kindly send me a tutorial for designing Buck converter. Thanks in advance, Vijay Anand. G
Hi there, Can any one suggest the method to stablise the programmable ouput voltage.. ciruit is using I2C POT to change the voltage in between...12V,24V & 30V...with i/p:48v.. I am not getting stable o/o vge... TIA, tom
is not that tricky. With a 60Vdc input it's a little tricky. It wouldn't be the most trivial buck converter. If you think that it's not that tricky at all, could you post a schematic and/or identify some parts? Added after 23 minutes: Andy, it just occured to me that you mig
Dear Friends, I am having a SMPS working in 48v dc and having o/p of +50V and -50V. Its uses TL494 and IRFs. Also using some transformers for taking feed back etc. Now its creating noise and also the output is not regulated. We are getting many o/ps in various frequencies(600-1500Hz). If any body knows about the designs using TL494, please help
Hai For developing a DTMF trigger through phone lines,I am looking for a simple telephone line simulator. requirements. 1 . line voltages 48v ON hook and 10-12V OFF hook. 2. ringing signal to be generated at will . 3. Dial Tone ,optional not must Links or suggessions or circuits. please. T
You can connect the 12-V fan to the battery terminal, but make sure that you connect only to 12-V not the whole battery because some UPS use series battery connection (to achieve more than 12V, e.g.: 24V or 48v). And, don't forget to interconnect it to the UPS switch so that the fan will not run when you turn off the UPS. aaNg
you are planing to do that using the normal telephone service or just puting one cable to conect these 2 computers ????? because you if you are planing to do the second, I think that its just not work becouse you don´t have the line signals like the -48v and the ring tone, if you can do that please let me know that it work, i tried and didn´t hav