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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
16 views

Car battery(12v) to 7v 2a (to power fan controller)

I recently installed an amplifier and sub woofer in my car and it is gets up to 40C where I live so my amp gets VERY hot. I want to build a box/amp rack for the amp which will have fans on each side ...
3
votes
1answer
43 views

Cause for failure after short circuit Step-Down Converter Input

I'm currently evaluating the Semtech TS30042 step-down converter. My input voltage is 24V, output voltage is 5V. I followed datasheet recommendation in my layout in most aspects. The problem is, as ...
0
votes
1answer
29 views

Can R-783.3-0.5 DC-DC converter be used with 5V input?

I need to use a DC-DC converter to obtain 3.3V/100mA from a 5V supply. I have a R-783.3-0.5 available, but I am not sure if it can work with 5V input. The datasheet says that the minimum input ...
0
votes
1answer
31 views

Connecting battery cells in series VS using boost converter

I need a dc output of 12V 60AH through 18650 li-ion battery cells to use with a 1000W AC inverter to power a 650 Watts computer ( each cell 3,7 Volts 3500 mAh ) One way would be make 17 packs in ...
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vote
0answers
43 views

Laser Diode Driver and Cooling

I am a newbie at analog design, and trying to design a laser diode driving circuit and TEC cooling circuit for a 14 pin laser diode, such as P1550-ADF-B: 1550NM ADF LASER DIODE which has forward ...
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0answers
28 views

How to do switching noise analysis of dcdc on LTSpice

Background : In one of my board i have used LT8471 as DCDC , as my cards being analog cards, i tried maximum to seperate the power network and analog chain from noise, my initial problems with dc-dc ...
1
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2answers
78 views

Non-isolated DC-DC buck converter layout - which one is better

I'm doing a DC-DC buck converter routing, using TPS62130. As known, the key point to route a DC-DC converter is to reduce the current loop area. In my design, I have a dedicated ground plane, so I ...
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votes
1answer
38 views

What load can i connect if data sheet is missing output voltage

I am looking at a DC to DC converter data sheet that has an input voltage of 0V-100V. The datasheet only mentions a max output current of 4 amps. Is it safe to assume I can place a load of any voltage ...
1
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2answers
143 views

DC-DC switching converter PCB design

Recently I had a problem with noises in my led driver. I realized that my PCB design was terrible, so I redesigned whole PCB following common rules. Could you take a look and check if my new design ...
0
votes
1answer
31 views

LM2596 Cin requirements

I'm going to use an LM2596. My maximum input will be 40V to a fixed output 5V 3A. I've read in the datasheet that for Cin you need 1.5x for an electrolytic capacitor. So 40V x 1.5 will be some 60V. ...
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votes
3answers
122 views

How does using a DC-DC step down converter save power?

I understand how DC-DC buck converters save power when compared with a linear regulator, but do they save power when compared to not using power conversion all together? In my specific case, I have a ...
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votes
2answers
31 views

How would you regulate/use 60V/1A or 12V/100mA to get ESP's 3.3V/~300mA?

I have a device with two possible output pins with max. rating 60V/1A and 12V/100mA that I would like to connect to an ESP8266 (that sends notifications when ON). To keep it simple, I would connect it ...
0
votes
2answers
67 views

Powering inverter gate needed for enabling a DC-DC converter

I'm designing a plugin card that's powered at 12V from the main board. Now, I need a 3V3 and a 2V5 voltages on the card, so I'm using two buck converters MUN12AD03-SH (I'm supposed to use this ...
0
votes
2answers
42 views

How much input voltage is required to get 12v from LM2596?

I am trying to run WiFi router from a 12v lead acid ups battery. To get a stable 12v output from the battery I used LM2596. Problem is output is always 8.28v-8.50v. No matter how many times I spin ...
2
votes
0answers
33 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
0
votes
0answers
25 views

How to model parallel dc-dc converters (transient analysis)

I would like to simulate two dc-dc converters in parallel using my own c++ algorithm. At the moment I have created averaged state-space equations for both converters, but struggle to get my head ...
1
vote
2answers
155 views

Buck converter design (311V to 3.3V)

I'm trying to make a buck converter which produces an output voltage of 3.3V with a load of around 1 amps when the input is around 220v AC. This basically means converting from 311v DC to 3.3v DC. I'm ...
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votes
2answers
75 views

Simple Buck/Boost/Other Topologies building tutorials [closed]

For educational reasons, I want to build physical DC-DC converters. I would start with simple buck or boost topology. For start, I wish to have a simple gate-drive for switches, without PWM modulation....
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votes
0answers
45 views

Issues to create a current control transfer function for a DCDC Converter

I'm trying to reproduce a work I've seen in an article, but I'm encountering some issues. I used the data provided and the transfer functions placed by the author, but I did not get the same result, ...
1
vote
2answers
60 views

boost converter for ultra low power application

I want to design a dc-dc boost converter and manage power (MPPT) for an ultra-low power fuel which contains input voltage < 1 V and input current < 500 uA. if I choose simple boost converter, I ...
0
votes
1answer
79 views

Which DC-DC converter for a uController

I want to power a uC project (uC is a STM32, supposed to be powered with 3.3V) over a LiPo battery. Since LiPo's output ranges from 4.2 volts to 3.7 volts, I feel unsure whether to use a step-down or ...
2
votes
2answers
23 views

TL494 minimum operating voltage VCC

Has anyone operated TL494 on +5VDC practically as it works in simulation software ? minimum operating voltage indicated in datasheet is +7VDC . please confirm.
2
votes
0answers
47 views

PoE+ Forward Converter Issues

I want to implement a 12v PoE+ PD power supply, and have settled on the LTC4269 for use in this application. Unfortunately I'm having problems getting my head around everything that is going on. A ...
1
vote
2answers
87 views

What does NP and NO means in datasheets?

I will be using a DC-DC Converter from Cincon: EC4BW11 I do not understand what NP and NO means on the pinouts. I am assuming that the input voltage will be connected on pins 1 and 2 (+Input, -Input) ...
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votes
1answer
31 views

What does it mean to have dual input range?

Hi guys I am looking for a wide range input voltages DC-DC Converter as my inputs would vary from 12,24,36,42Vdc. I found this, the Murata NCS12 series which have an input ranges of 9-36V and 18-75V. ...
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vote
1answer
59 views

Eleminating radiation from chargers

When I move my EMF radiation meter near a charger it shows me that there is radiation from the charger, and even the device itself radiates when the charger is connected to it. The chargers emit ...
0
votes
2answers
74 views

Need help to design voltage regulator circuit with LT1959

I am planning to use LT1959 IC for making a voltage regulator circuit for 3V 1A output. The datasheet does not mention maximum allowed value for input capacitor for the circuit. In order to meet the ...
0
votes
1answer
37 views

How to calculate secondary RMS current of each winding in multiplre output flyback converter?

As I am designing multiple output flyback converter and I have confusion in selection of wire gauge of the secondary winding. There are 4 secondary windings and one bias winding. Mode of operation is ...
0
votes
0answers
123 views

Who can show a schematic for a voltage switch

In earlier questions I raised a problem about a DC-DC booster that destroyed itself when its load was disconnected by drawing a large current from its input power source. This was specific when using ...
0
votes
1answer
61 views

Need help to determine whether Mosfet is suitable

I am going to make a regulator circuit with 3.3V 2A output using MAX1655 Step down controller. I am going to use a solar panel with following specs for input: Max output voltage: 8.4V Nominal ...
0
votes
0answers
25 views

Fly-Back converter in Proteus

I have been having this problem since I started to design my Fly-Back type voltage converter, and it is that it is throwing me a time step too small error, and I tried to solve it by configuring the ...
1
vote
1answer
68 views

DC-DC converter in “parallel”

I'm designing a system that needs two converters. The Vin input voltage is approximately 14.5V. I need to lower the Vin voltage to 12V and also to 5V. I chose two LM2576-5 (5V) and LM2596-12 (12V) ...
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votes
1answer
28 views

Digital pulse converter from 3.5v to 10v [closed]

I have flow meter generating pulses at TTL that is 3.5v. My pulse counter needs 10v pulse. How can converter 3.5v pulse to 10v so that it can count. Will DC to DC converter like here https://www....
0
votes
1answer
36 views

bidirectional buck/boost converter vs separate buck and boost converters

I have recently leared about bidirectional buck/boost converters. They can be used in hybrid vehicles for optionally charging a 12v battery from a higher voltage battery or vice versa. How would one ...
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votes
1answer
106 views

0-9 V DC to -9 to 9 V? [closed]

I have a DC signal going from 0 to 9 V. How can I rescale it to the -9 to 9 V range? enter image description here I have infra red sensor , this sensor is damaged , this sensor generate _9 to +9 DCV , ...
2
votes
0answers
65 views

55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
-1
votes
1answer
30 views

buck boost converter design using LM3759

I have requirement of DC output voltage in the range of 8V-30V and DC Output current to be max. 40Amps. I am using transformer 28-0-28, 7A rating transformer for the AC source. Can I change the ...
1
vote
3answers
66 views

Is it necessary to add fuse protection (at the inputs) when using multiple DC-DC converters?

I would like to know if it is necessary (or recommended) to add fuses at the inputs when using multiple DC-DC converters. I have attached a quick schematic to illustrate what the design would look ...
1
vote
1answer
64 views

Problem with chopper opamp(s)

Specifically, the LTC1150, but have also seen it with another similar opamp. Powered from +/-9V DC-DC converter with a startup ramp of about 15ms. It is in unity gain inverting configuration (10K ...
5
votes
3answers
673 views

Startup problem in boost converter

The figure below is a diagram of a voltage-mode controlled boost converter. I am wondering how experts solve the start-up problem for this converter. Problem: Assume the output voltage is zero at ...
-1
votes
1answer
44 views

Power bank charging using a solar panel

I'm trying to charge a power bank of 5V, 5000mAh, using a solar panel 6V, 14W. I have made the connection from the solar panel to a DC-DC convertor (specification: 3-37V, 3A) which steps down to a ...
0
votes
3answers
63 views

Need help to find replacement for power mosfet IRF7303

I have to design a voltage regulator circuit using DC-DC controller MAX1655. Required voltage output from the circuit is 3.3V at 2A (circuit is shown at page 10 of datasheet). According to the ...
1
vote
2answers
44 views

Placement of sense resistor on DC-DC converter

For my design I am using DC-DC converters LTM4620 and LTM4644, which integrate the MOSFETs and the inductor in the chip. For measuring the output current, I will add a sense resistor in each output ...
0
votes
0answers
27 views

Forward converter power

I found a TI reference design, which is class 4 PoE with 25W output power. I looked at the schematic and made some calculations: I looked up the transformer turns ratio, which is P:S = 1 : 0.16 (...
1
vote
1answer
69 views

Need help to determine whether PWM frequency is suitable

I am using a solar panel as the power source for making a simple DC motor based fan Parameters of panel: Voltage at max power point:8.2V Nominal output voltage:6V Max output current :0.62A Max ...
1
vote
2answers
76 views

Negative input, negative output switching regulator?

I've got a component within a larger device that requires both +15 and -15V, drawing about 100mA per rail. In addition, the main power supply of the larger device is providing +/- 28V, with a common ...
-2
votes
1answer
91 views

I wanted to convert 5-12v dc to adjustable positive and negative 70v DC supply

I've found couple of ICs which could do the job of converting 5v to +70v. But what I wanted is a bipolar boost converter which could convert 5-12v of dc input to +70v and -70. I needed this conversion ...
1
vote
1answer
58 views

DC/DC step-down regulator destruction because of inductive load?

I was evaluating PAM2316 DC/DC step-down converter and destroyed several of them, I suppose the cause could be an inductive load. See my schematic and my layout here: Let me explain: The circuit was ...
0
votes
0answers
44 views

Need help to design a voltage regulator circuit for two 3v dc motors

I intend to use two DC 3V motors to make a mini water pump as described in this video. Here are the specs of my solar panel which i intend to use as power supply for the circuit: Voltage at max ...
0
votes
0answers
27 views

NCP3420 failing in buck converter

I designed a constant current buck DC-DC super-cap charger with the NCP3420 as a dual MOSFET driver. The current is hysteresis controlled and the disable and PWM lines are pulled low on power-up. The ...