DC-DC conversion. Implies conversion of a DC voltage level up or down. DC-DC converter can be isolated or non-isolated. Electronically it can be done by many kinds of circuits, depending upon the application (charge pumps, voltage multipliers, linear voltage regulators, boost/buck switched ...

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1answer
15 views

RT8298 malfunction

I am using the RT8298 chip for voltage regulation. I am stepping down 12V to 5V using this regulator. Sometimes though this chip fails. What I found out is the malfunction on the Vcc pin. Whenever ...
1
vote
2answers
81 views

How to connect 2 3v3 lines in parallel from different dc/dc converters?

Is there any way, to connect 2 different (but same output voltage) dc/dc converters? One of them works on 5 to 40 Volts, and one on 3 to 5.
0
votes
0answers
19 views

Taking a 3V solar panel to charge a 3.8V LiPo Battery using step up converter

I am trying to make a self sustaining system that uses a solar panel and LiPo battery. The LiPo battery is a standard 3.8V battery with recommended charging at 4.2V. I have a solar panel that has ...
2
votes
2answers
91 views

How can I make any basic boost converter that actually works?

I have spent probably around 8 hours working on this today, and I cannot make any progress. I'm trying to use the TI MC33063A in a boost converter circuit, just to make a proof of concept. Right now ...
4
votes
1answer
95 views

How does this DC/DC converter work

I've got my hands on a bunch of old garden lights with solar panels, and of course I disassembled them and found that they use just one 1.5V accumulator cell to light up the LED. Just for ...
3
votes
1answer
264 views

Why is my DCDC getting fried when driving a stepper motor

I'm trying to get a stepper motor running using an L6470 stepper driver. L6470 is connected according to the recommended design. The motor is a NEMA23, rated 2A, inductance of 5.2mH and resistance of ...
0
votes
0answers
43 views

design of boost converter 25-250V (CCM)

I am working on design of a boost converter. After doing some research, I found following values: D=90% L=0.00075 H C=0.0000072 F R= 250 Ohm fs= 10 kHz But my output voltage has a peak value of 50000 ...
5
votes
5answers
1k views

How to reduce 5 volts to 4 volts 1.5Amp with minimum components used?

I am trying to reduce 5 volts high current source to 4 volts with at least 1.5 amperes. I searched the internet, but I could not find 3 pin voltage regulator, 5V(in) 4V(out)voltage regulator. I think ...
0
votes
0answers
61 views

Stacking DC-DC converters

I'm currently building a high-power LED driver to be powered from a 2.7V supercapacitor. To this end, I'm seeking a solution with high current rating (up to 3A, so ideally a controller IC rather than ...
-1
votes
0answers
43 views

synchronous buck converter

!I have designed synchronous buck converter circuit for 48v to 12v conversion. LT regulator IC is used for regulation. Maximum load current is 4A. I am increasing load from 1A to 4A stepwise. I am ...
0
votes
1answer
43 views

Maximum current draw from a step-up regulated output

I have a LiPo battery pack with 5V, 2.1A output. Now, let's say I boosted that with a step-up regulator like this Pololu module. At 12V output from the regulator, what is the maximum current I can ...
0
votes
1answer
43 views

Spread spectrum 400 KHz

I got a 6-phase DC-DC converter. Fsw=400 kHz, synchronization by external clock(CPLD). I need a spread spectrum 400 kHz. What's the best way? All chips what I've seen before worked on MHz and above. ...
0
votes
0answers
34 views

help in boost converter

I am trying to work on boost converter and my object is to get an output of 6ooV. The maximum output voltage I am getting is 400V. I have attached my design. Can anyone help me in this please?
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votes
2answers
79 views

Voltage regulator lm78xx for 220v?

I can see that the input voltage of the lm78xx series is 30-40v dc . We are looking for a voltage regulators system , that will get the 220v ac , and turn it into a : 3.3v, 12v, 24v, dc . I was ...
1
vote
1answer
47 views

Inverting buck-boost vs. positive buck-boost

Should I use an inverting buck-boost or a positive buck-boost topology? Input voltage range = 19-22VDC, Output voltage range = 10-56VDC, Application = LED driver The app not I have says the ...
0
votes
2answers
71 views

Can 2 boost converters outputs be put in parallel at the same voltage?

I have a slight doubt here. Can the outputs of 2 boost converters set to output the "same" voltage (isolated, they would never be exactly the same obviously) be safely tied together, as long as there ...
2
votes
1answer
70 views

push pull drain severe ringing

Background: I am trying to make a push pull dc-dc converter from 12vdc to 400vdc for an inverter with a center tapped transformer connected to battery of 12vdc. The MOSFET circuit is as follows As ...
1
vote
1answer
58 views

Sanity check: Input and output filter for a stacked pair of DC/DC converters

In my current project, I need voltages of +/- 30V and +/- 15V for analog control purposes. The current on the 30V rails is fairly limited, ca. 70mA max on one rail and <10mA on the other. The 15V ...
3
votes
3answers
104 views

Is this the proper way to fuse a DC/DC Converter?

I am designing a solar power system for camping. I'll use a couple different DC/DC converters to provide DC voltages for the specific items I want to power. I want to properly fuse the various ...
2
votes
2answers
191 views

What LED driver IC options do I have to build a two-cell driver for a 3 W LED?

I need a very small and light 3 W flashlight/headlamp for a kind of specific purpose. I want to use two AAA Eneloop cells. In the datasheet there is discharge curve at 1.6 A, so I guess I ...
0
votes
1answer
62 views

Need to isolate panel meters from each other?

I have a computer power supply I am planning to use for electronics work. I was planning to make a box with voltmeter/ammeter panel meters on each output voltage (3.3V, 5V, 12V, -12V). I have read ...
0
votes
1answer
66 views

DC/DC converter 12V > 5V providing 400 Watts? [closed]

I'm not acquainted with electronics, so please be patient with me ... I want to drive a large LED strip from a car battery. Unfortunately, the LED strip requires a maximum of 400 Watts @ 5V. Now I ...
1
vote
2answers
62 views

Convert a device that is powered by a 12V 2 amp ac-to-dc SMPS to a battery powered device

I have looked up my requirements in all possible sources (Google, StackExchange, DiY boards, etc.) but I have not been able to find a clear answer to my problem. What I have is a device that needs ...
0
votes
1answer
72 views

Choosing a high-power LED Driver IC [closed]

I need an LED driver to power one (or more) high-power LED(s) for a torch. Design requirements: Efficiency is paramount, since the power source is either a battery or a supercapacitor. Must be able ...
0
votes
3answers
93 views

SMPS: What is current mode instability (aka “sub-harmonic oscillation”)?

In peak current controlled switching power supplies, there is a phenomenon called “current mode instability” aka “sub-harmonic oscillation”. What is that? Can't seem to get a good explanation of ...
0
votes
1answer
48 views

Microcontroller self-shutdown with MAX682

I have read How to implement a soft power switch controllable by microcontroller? and am wondering if something similar would be possible with a MAX682. What I want, is a device that is turned on by ...
0
votes
2answers
41 views

Component selections for the ETA3406 DC/DC converter

I was browsing Seeed Studio's Open Parts Library and found the ETA3406, which is a 1.5 MHz 1.2 A Step-Down Converter. It's pretty cheap, and looks very useful for something I want to build, but the ...
2
votes
2answers
133 views

Can I use a 12V 70A source to convert/boost to 24V 5A supply?

I have a self built custom made computer that is using a Ultra X3 1000 watt power supply. Over the years I have been reducing the power needs by adopting more energy efficient hardware. My computer is ...
0
votes
1answer
96 views

Inductor calculation for DC to DC converter

How can I calculate the value and characteristics of inductor in a DC to DC converter?
0
votes
0answers
40 views

SC circuit equivalent

Can someone help me find the equivalent SC circuit for figure 3? Just like in figure 2 with its equivalent circuit in figure 1. I'm just confused with the drain of M6 connected to gate of M2 at node ...
0
votes
1answer
80 views

Convert 12VDC to 15VDC?

I have a 12V DC power supply and have a digital guitar pedal that needs 15V DC. There are a few other 9V/5V power circuits that I created using voltage regulators and a couple of capacitors, but I'm ...
0
votes
1answer
73 views

Selecting diodes for HV full bridge rectifier

I'm using a current-fed Royer self resonant circuit to generate 1kV DC output voltage. The transformer is producing a sine wave of 100kHz/2kVpp (Cap-Royer = 100nF). At the output of the transformer I ...
0
votes
0answers
63 views

Best Topology For High Voltage Isolated DC-DC converter (12V to 240v , ~0.2A)

I have been searching for a design that can serve as a basis for a supply as above, with the following design requirements. It seems most designs I can find are for low power (<10W) Flyback ...
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votes
3answers
219 views

DC boost converter and Ohm's Law

A circuit has a resistance of 1 Ohm, a DC power supply rated at 9W is delivering power to the circuit. Using a DC boost-converter that takes in an input of 9W can it output different voltages? Even if ...
2
votes
1answer
100 views

Optimal Capacitor Placement on DC/DC Convertor

I'm trying to decide on the best layout for caps on a DC/DC converter. Which of the following options (or another, unlisted option) is the best choice? GND Out plane with 5V Out going the opposite ...
0
votes
0answers
46 views

Cheap, easy, safe source of 100V DC at 10mA

I'm looking for a DC source to drive some little neon lamps (probably no more than 10-15 at a time). Their breakdown voltage is around 90V DC, and I would very much prefer to not mess around with line ...
1
vote
2answers
93 views

Inverting (Buck-boost) converter polarity problem

I have trouble understanding something in the circuit below. It is inverting converter, seems quite easy, but the part I don't get is when the switch is OFF we have forward-biased diode, i.e. plus on ...
0
votes
1answer
76 views

Active load using MOSFET

Good evening! I want to create an active load system where I can vary the PWM signal from the microcontroller to the control input of the MOSFET which is attached to a fixed resistive load. I want ...
0
votes
1answer
38 views

ST1S10 step-down regulator - can I drive the EN pin from the voltage divider?

The ST1S10 step-down regulator (http://www.st.com/web/en/resource/technical/document/datasheet/CD00169322.pdf) has an INHibit (active low) / ENable (high) input terminal, like any other DC-DC ...
0
votes
3answers
168 views

Boost regulator from 3V to 14V; then two LDO to make a +5/-5 power supply?

I am designing a mixed signal circuit and I need +5/-5 dual supply for my opamps. Could the following configuration work, else what are my alternatives? ...
0
votes
2answers
92 views

Best way to power sensor circuit from LiPo

I want to make small (~cigarette pack size) oscillometric blood pressure monitor (with arm cuff). The device will be powered by single cell 3.7V LiPo battery with USB charger circuit, without LCD ...
1
vote
1answer
84 views

Slow start up of LM3578

Hello all, I have this circuit which will take an input (4x1.5AA (3.5V~6.2V)) and output a boosted voltage of 12V (120mA). The problem I am facing is that the voltage takes about 10s. to build up ...
0
votes
1answer
98 views

How to make a 50V regulator?

How do I regulate the output coming from a 50V transformer? At the filter's output, the transformer has 50*1.4142=70.7 volts. But this voltage of course drops as a load is applied, since the filter ...
1
vote
2answers
141 views

Stepping down 12 V to 9 V with minimal waste of energy?

I have a 12 volt gel cell battery that outputs 13.6 volts when fully charged. I wanted to use it to provide backup power to my modem and router (both of which are supposed to draw a maximum of 0.6 A ...
1
vote
2answers
194 views

Converting 28VDC -> 14VDC at around 200A How do you pull that off with that kind of current?

Current boat has 110AC air conditioners and some small appliances but the rest of the systems are on 12VDC. Genset ate a jellyfish and has to be replaced, so I'm working out options to upgrade/change ...
0
votes
1answer
47 views

DC/DC Converter doesn't convert to 3.3V

I have a 5V DC input. I want to convert it into 3.3V DC. I'm trying to use VBT1-S5-S3.3-SMT DC/DC converter. I'm connecting my input to second pin of the converter. But it doesn't give 3.3V DC as ...
0
votes
1answer
77 views

Real world efficiency of a LM3150 Webench DC power supply design?

When designing a DC/DC step down converter with TI Webench with these parameters: Vin min: 11.4 V Vin max: 12.6 V Output : 5.0 V Iout : 8.0 A Ambient temp: 30 ºC Then turn the efficiency knob ...
0
votes
2answers
205 views

DIY 5v Solar Panels

In a nutshell : What is a good way to power a 5V project with one-two 0.5 V solar cells? The motivation is as follows: My project needs about 2.5-5 Watts from the solar panel. Also, this project ...
2
votes
6answers
1k views

Reducing voltage with resistors

I have been looking around for an easy way to convert 12v to 5v. I have seen some people saying that a simple resistor is all that is needed. ...
0
votes
2answers
75 views

LM2596 minimum input voltage question

I'm trying to feed the LM2596 (DC to DC) booster a 9V battery. Now, I see that it has a minimum voltage required of 3V. My question is this: What happens when my 9V battery drops below 3V? Would ...