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
14 views

5v or 6v operating dc-dc for mobile battery?

For mobile battery, what voltage is suitable btwn 5v or 6v? What factor does influence on choosing different voltage for mobile battery?
0
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0answers
21 views

why 5v or 6v analog cmos is general for dc-dc? [on hold]

In BCD technology, why is general to use 5v or 6v cmos? What is difference between 5v cmos and 6v cmos when we design dc-dc? Which is better in these days? Do you think operating voltage is getter ...
1
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1answer
42 views

Excessive Boost Converter Output

I'm implementing a boost switching regulator based on a Texas LM5002 chip (datasheet), to get about 65V from a 12V supply. The design I've arrived at is shown below, inspired both from the data on the ...
-1
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0answers
20 views

How to charge a phone slowly with a boost converter [on hold]

I have a super capacitor that charges slowly to 5 volts from 0 volts. Once it's charged to 5V, I would like charge a phone until all the voltage is drawn. Then wait super capacitor charge to 5 voltage ...
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0answers
31 views

Ideas for powering multiple DC devices from Battery being charged from AC [on hold]

I live in a place with regular power failure. A few hours every day. Was looking at getting a UPS, but most of my equipment is low power (5V-12V). So it's kind of silly to get a ups to up convert ...
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2answers
26 views

Stepping-down DC voltage (at low current) in the presence of an audio circuit

I'm trying to add a bluetooth audio receiver to an old 12V battery-powered boombox. The receiver board takes 5V and shouldn't draw much current, but I'm trying to understand which type of DC-DC ...
0
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0answers
16 views

Find duty cycle ratios and ripples frequency in DC-DC converter

I am asked to find the duty cycle ratios (D1 & D2) and ripple frequency of the two control principles of the following circuit: The bridge is controlled to provide an average output voltage, Vo ...
1
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0answers
64 views

Step Up DC DC [12 to 300] using MAX1771 Chip

I am trying to build my first circuit following the information posted here 12v to 300v Boost Converter - Ideal Inductor for 9kOhm load I tried to answer there before opening this new topic,but I need ...
0
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2answers
57 views

How to convert 12v dc to smooth, as if coming from a battery, 6v dc (EMI – RFI free)

I’m an electronics newbie. I did a very simple project. In order to convert 12v dc to 6v dc I used one of those step down converters. Unfortunately what I’m trying to power is an AM radio. It power on ...
2
votes
1answer
42 views

AP5002 step-down switching regulator loop stability

Problem, parameters I have an 5V output power supply, with 2S LiPo input (6-8.4V), implemented with AP5002 (PWM control 2A step-down switching regulator, docsheet), and for the life of me, I can't ...
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0answers
44 views

24V Step Up Voltage Regulator using a 6s Lipo

I want to supply 24V at 500mA to a wireless router via a 6s LiPo battery. The issue is that at full charge the battery supplies 25.2V (4.2V fully charged * 6 cells), but as the battery discharges it ...
0
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2answers
54 views

Create a Time-Variable Dc Power Source

For some reason, I need a Time-Variable DC power source that changes it's value according to time. I need this changing of value to be controllable. I'll put it this way : Say I have a 12 volt DC ...
0
votes
1answer
67 views

using an “isolated DC/DC converter”, what is the schematic?

I'm trying to use a "isolated DC/DC converter" (5v --> 12v converter) (MEE3S0512SC, ...
0
votes
1answer
33 views

Output Capacitor value calculation based on Transient response in Buck converter

In Buck design, The output capacitor's initial value is calculated based on how much current transient buck will support. Few equations took from appnotes. from these equations, for A given ...
1
vote
2answers
72 views

Trying to build a circuit to boost 5 V DC to 250 V DC with fairly low current output

I am fairly inexperienced with electronics, but I am trying to build a 250 V DC supply from a 5V source. From research, I have run across charge pumps and boost converters. I tried using charge pumps, ...
0
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2answers
33 views

Which Power Management implementation to use and the differences therein

Upon using an 'RF to DC converter', DC power management is needed. There is a dilemma in the approach as there are a number available. From the storage capacitor, there is the 'Switched-mode power ...
15
votes
1answer
573 views

Isolated DC/DC Converter - Purpose of Capactor connecting two GNDs?

I've been looking at board mount isolated DC/DC converters to use in an application. I found this rather reasonably priced for my needs. Here is what I'm confused about, what is C103 doing here? Isn't ...
4
votes
3answers
291 views

DC-DC Converter Unusally Low Load Capability

I've been working on trying to get this SMPS to work for a while. I'm using an LTC1872, a step up DC controller with current limiting. The circuit used is the typical application provided in the ...
1
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1answer
134 views

How to bypass DC-DC converter with N-channel high side MOSFET

I have a DC-DC SMPS converter which is used as a pre-regulator in the power supply with linear post-regulator. A specific requirement is to provide mode of operation when pre-regulator is bypassed. ...
0
votes
1answer
62 views

DC- DC converters

Is it possible to get a DC DC converter which the output voltage varies proportionally to the input voltage? ie 14V in 28V out, 13.4V in 26.8V out. To add some context I wish to charge a 24V battery ...
1
vote
3answers
136 views

Solution for “No drop” LDO

I have a very noisy 5V supply, the noise is in very low FQ around 1kHz. From all the components In my project there is only one I have to provide with 10Hz - 2kHz clean 5V. But because I need 5V ...
1
vote
2answers
107 views

How to drive an IGBT with an optocoupler?

What's the proper schematic for driving the IGBT (IRG4BC20UD) from a microcontroller (MSP430-g2553) pin through the optocoupler (FOD3184)? I am going to design a full bridge inverter to drive 9W CFLs ...
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votes
2answers
72 views

What can cause the output voltage of a buck converter to drop (apart from high current)?

I am using the LTC3388-1 buck converter to provide a microcontroller with a regulated 1.8V voltage. I use pretty much the reference circuit as seen in the image. When I disconnect the ...
2
votes
3answers
116 views

What does the line “edge resonance between an inductor and a capacitor” exactly mean?

I am working on a project on DC DC converters in which the concept of soft switching i.e, Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) are used. One method to attain this is using an ...
1
vote
1answer
46 views

Pololu step-up converter drops voltage

I have a Pololu 3.3V step-up converter - U1V11F3. I tested it by connecting a regular 1.5V alkaline battery for input and a resistor at output. With no load or small load (10K) it keeps the output ...
3
votes
2answers
157 views

Why does the current rise and fall linearly in a DC-DC converter?

I don't understand why the current in a DC-DC converter rises and falls in a triangular waveform pattern. I think it has something to do with the energy in the magnetic field, but I don't know any ...
1
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4answers
85 views

DC/DC overvoltage problem

I am using a 12V to +-5V NMH1205DC converter. When I measure the output voltage without a load, it measures about +-8V. This converter will power a low current circuit that contains several OpAmps. ...
1
vote
1answer
43 views

How is the switch current related to output current in a DC-DC converter?

I have designed and implemented a DC-DC converter with the following specs: Input Voltage: 5V Input Current (max): 3A Output Voltage: 12V Output Current (max): 1A DC-DC Controller: MC34063 Inductor: ...
0
votes
1answer
113 views

Op amp based DC-DC voltage doubler

I have a LM471 op-amp and a single DC 5V source. Is it possible to double the source voltage using this op-amp? Can the op-amp be powered by the very singnal to be ...
0
votes
0answers
43 views

voltage regulator fail

I am using the RT8298 for voltage regulation. The parameters of my system and the schematic are stated below - Vin = 8V-12.6V, Vout = 5V Iout(max) = 5Amps. The ripple current = approx 25% =1.25Amps. ...
0
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0answers
60 views

inductor selection for DC DC

I am using a buck conv rt8298. My load is abt 5 amps. Input is 12v and output is 5v. I selected an inductor of 8.2uH. The formula tells abt 3.4uH. And sometimes it does not work. Just becos I choose a ...
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0answers
48 views

RT8298 oscillations in output

I am using the RT8298 dc dc from Richtek. I find an anomaly in the behavior of the chip. When the input is a max of 11V the o/p is smooth dc level of 5V. When it is greater than 11V there are severe ...
4
votes
3answers
550 views

What is a DC DC controller?

I have heard about DC DC converters and I understand what they are but what is a DC DC controller? What is the difference between the two? Like this LM5085, I cannot understand the major difference ...
1
vote
2answers
93 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.
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votes
0answers
80 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
142 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
115 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
285 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
62 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
63 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 ...
0
votes
1answer
53 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
46 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
45 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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2answers
101 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
84 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
145 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
139 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
81 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
124 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 ...