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
49 views

Standard transformer for higher-voltage dual output flyback converter

Is it possible to modify this flyback converter to get the output voltage somewhere up in the range of +/- 26-60v (preferably 30v or more) without having to make my own transformer? I would also like ...
1
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1answer
55 views

Voltage step up for bidirectional current source

I will be using a circuit similar to the following to create a bidirectional current source driving a max load resistance of 10k at a max of 2.5 mA. (based on this article ...
0
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2answers
52 views

How to design a boost converter? And how to specify the inductor and capacitor values?

I want to design a boost converter with input of 48V and need to get to a voltage of 100V. How to select the inductor and capacitor values in it?
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2answers
52 views

What is the difference between linear dcdc and nonlinear dcdc [on hold]

I was going through a Datasheet of an PMIC which has DCDC control register bit, which can be enabled to linear / non-linear i ...
0
votes
3answers
34 views

Which low pass frequency filter to configure to measure/calculate DC-DC converter efficiency?

I am measuring the DC-DC converter active power (P in watts) efficiency of a TI (Webench) LM3150 PCB that converts 12 to 5VDC. In the answer of question Measuring precisely the efficiency of a power ...
4
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2answers
170 views

What is dead time in DC-DC converters?

In a power management integrated circuit (PMIC) documentation I came across a programmable dead-time parameter for a DC-DC converter. What does ...
7
votes
3answers
611 views

How does DCDC save power over an LDO?

I am using a camera module of our custom application. The camera module started consuming more current when compared to a previous board which has all the same settings, chipsets and modules. In our ...
0
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0answers
9 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
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0answers
31 views

how to get pure square wave at input side of a high frequency transfomer

i need to get a pure square wave at the input of high frequency transformer in llc type dual bridge dc-dc converter circuit. but iam getting total pulses instead of square wave. do i need to connect ...
0
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0answers
26 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
0
votes
0answers
27 views

LTSpice parameter sweep of multiple values

I have designed a boost converter for my power electronics class in LTSpice. The thing works just fine, now all I have to do it fiddle with the component values and frequency to describe the trends I ...
0
votes
1answer
43 views

Power regulation and isolation for low current device

I'm looking for a solution to regulate power and provide isolation for a 3.3VDC system. I am using a 5VDC 500mA power supply that needs to be regulated to 3.3VDC with isolation to protect analog ...
0
votes
0answers
59 views

Single or dual ground plane for SMPS DC-DC converter?

I'm working on DC-DC converter prototype using dual layer PCB. Layout it finished using bottom layer as ground plane. Question is does make any sense to put on top layer also ground. How that can ...
2
votes
1answer
67 views

Reduce voltage by a constant 100mV

For a project I have a digital thermometer which outputs a DC voltage of 100mV at 20 degrees C and 250mV at 50 degrees C, which is the range we're interested in. We're putting that into an Arduino via ...
0
votes
1answer
31 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?
1
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1answer
59 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 ...
0
votes
2answers
29 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
22 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
113 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
votes
2answers
66 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
49 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 ...
0
votes
2answers
59 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
77 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
48 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
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2answers
83 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
votes
2answers
41 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
597 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
297 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
161 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
63 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
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3answers
149 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
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2answers
132 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 ...
0
votes
2answers
75 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
130 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
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1answer
50 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
173 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
89 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
49 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
157 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
45 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
votes
0answers
68 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 ...
0
votes
0answers
50 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 ...
5
votes
3answers
568 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
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2answers
104 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
141 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
153 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
119 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
294 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
69 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 ...