Questions tagged [dc-dc-converter]

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 converters, etc)

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2answers
43 views

Isolated DC-DC coupling capacitor location?

For a coupling capacitor across the isolation barrier of a DC-DC converter to provide a return path due to the parasitic capacitance in the transformer, there seems to be many different configuration ...
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28 views

Input filter on DC-DC converter when it is the only load on a source?

Many app notes recommend placing an LC filter on the input of a buck converter to stop switching noise travelling back and thereby affecting other parts of the circuitry. But in the scenario where ...
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37 views

Which transition mode for the four switch buck boost converter is correct?

I am currently researching on the application of the Four Switch Buck Boost Converter on a Fuel Cell Hybrid Vehicle, and I would like to ask about the transition mode of the buck boost converter. I ...
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122 views

Powering opamp from unregulated DC-DC Converter?

When using one of those unregulated, isolated DC-DC bricks (its output voltage can be as much as a few volts higher than its rating and varies with load) to power an opamp is a voltage regulator a ...
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38 views

4 Quadrant DC chopper Operation

can anyone explain 2nd quadrant operation of DC chopper in easy way? may i ask about how brake applied in 2nd quadrant
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12v load doesn't turn on with boost converter

I'm trying to build a power source for my router during load shedding. But the router doesn't turns on while connected to any sort of boost converter. I have tried 5 more different routers from ...
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107 views

Is there anything glaringly wrong or bad with this circuit?

I'm changing out the pump for a pond and I am looking for an objective set of eyes to either confirm that my idea will work or to tell me it won't and why. I've attached a diagram to help explain ...
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81 views

Low efficiency buck converter

I've seen the circuit below on YouTube. But it has low efficiency and the p-chnnel MOSFET gets hotter as the output & input voltage difference increases (it goes above 100c with heatsink). I don't ...
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38 views

Selection of DC-DC converter for boosting 4.2V to 5.0V

I need to boost 4.2V (out of MPPT/ 18650 battery charge) to 5V (input for ESP8266.) To accomplish that I've bought this item, a 2.0 - 24V boost converter, which supports 2A. But when trying to do so - ...
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Setting minimum output voltage of boost converter with potentiometer and resistor

I am designing an LED light project using this Cree XLamp LED, (Forward voltage is 36V, forward current is 2400mA) and I am looking for a way to limit the output voltage of a boost converter by adding ...
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36 views

How does this specific boost converter work?

So I found this Geiger counter at https://mightyohm.com/blog/products/geiger-counter/. You can also find the detailed electronic schematics there. I tried to figure out how this apparatus works, but I'...
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Type-III Compensator design for Half-Bridge DC-DC converter control [closed]

Can anybody guide/share some technical documents which can help me to design type-III compensator for DC-DC Half-bridge?
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Establishing Safe Operation Range for Lipo Battery with Buck Boost Converter

I have a circuitry that I need to power up with lipo battery. I need to regulate battery to 3.3V with buck-boost converter, since LDO can not be able to provide required current output and causes ...
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38 views

Buck Converter design, which is better? 48V->12V direct conversion or 48V->24V->12V conversion for 12V application

I am designing a 1KW DC-DC buck converter with Vin(51V battery pack with Vnom = 48V) for driving four 250W motors. Is it advisable to step down the voltage directly from 48V to 12V or should I first ...
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94 views

Isolation Circuit Question - How does this feedback work?

I am completely stumped. I have been troubleshooting this circuit for some time, and is what powers another circuit. The thing is, I have no idea how this thing works (not well as of late, due to ...
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How to boost my Lipo battery automatically when connected to a load?

Ibam using a Lipo battery to boost the voltage from 3.7V to 10V using a MT3608 module. Since the MT3608 module always boosts the voltage no matter if I connect the load at 10V. Is there a way where ...
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MIC5158 how to avoid MOSFET heating

I have implemented DC-DC converter with mic5158 (schematic like in datasheet, no current limit, adjustable output), all work fine, except mosfet heating while medium load. After investigation of this ...
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Iso DC-DC PCB heat dissipation technique proposal

I'm designing a custom 8-Layer board. The main power supply is based on a 24V-12V Iso DC-DC (Tracopower TEN 40-2412WIR). I'm a little concerned about the heat generated by this device because it's ...
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characterize internal capacitor of optocoupler

I am reading article Using an automated Excel® spreadsheet to compensate a flyback converter operated in current-mode by Christophe Basso, Tomas Petrek/David Sabatié. In page 12, they explained how we ...
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62 views

Logic level switch controlled via ground (0v)

simulate this circuit – Schematic created using CircuitLab Hello, all. My goal: to convert a ground signal pulse into a +5v signal pulse. My question: How on earth do I do this? Backstory: My ...
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Undervoltage Testing of a LDO or Switching DC-DC Converter

I am using a Regulator section in - UJA1076 this IC Input Voltage = 16V Output Voltage = 5V Load Current = 0.1A My question is, I want to test the undervoltage condition 90% and 70% as mentioned in ...
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Would using step-up and step-down converters in the same circuitry damage the battery?

One of my projects, to be powered by 2S Lithium Ion batteries (7.4V), requires various voltages, such as 3.3V, 5V and 12V, to be derived using a couple of step-down and a step-up converter. I am ...
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31 views

DIY Power Bank For Router & Fiber ONU

I'm trying to build uninterrupted power bank for my 9V 1A router and 12V 0.9A ONU. I have made a circuit Mindmap. But I think I have done some questionable things in it. Such as, I don't know the ...
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Buck Converter Switching Pin and Voltage Output

By using rohm's BD9G341AEFJ-LB buck switching regulator, we want to take 5V. In datasheet BD9G341AEFJ-LB's datasheet the example circuit given like But we had to try circuit that is in Image-2, ...
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Is it possible to charge a laptop with a DC-DC converter using a 12V deep cycle battery

Am just curious if I can use a DC-DC converter and 12v deep cycle battery to power a laptop directly.
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High voltage indicator circuit and short/open circuit protection best implementation

I am going to designing a PCB for a high voltage, 6kV and 3kV @ 10mA/200mA (660W) power supply for my Ph.D. As you will know, the equipment needed to work at this level is very expensive and as a ...
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How can I make a half-duplex UART to TTL converter for communicating to a servo with a HC04 and a HC126?

I have been trying to configure this circuit for some amount of time. I am using a HC04 chip and a HC126 chip. The HC04 is an inverter chip. The HC126 is a buffer gate. I found that for the servo ...
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45 views

How to control the non-isolated bidirectional buck-boost converter?

I have been working on a control software for below given bidirectional buck-boost converter. The planned usage is for charging and discharging of a traction battery in electrical vehicle. I am not ...
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188 views

LDO linear regulator output problem

I am using this LDO Input Voltage is 14V Output Voltage is 5V Maximum Load Current is 150mA Schematic : I am observing two problems: Problem 1: Initially when I power on the LDO by given the input ...
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75 views

DC-DC boost converter resets mcu

Edit: A p-channel mosfet to keep DC boost circuit separated from main circuit until its charged worked like a charm. I'm trying to build a DC-DC boost converter, controlled by a 200kHz PWM signal ...
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36 views

Using an old eBike battery to power an electric trolling motor

I have a couple of old 36v eBike batteries lying around. I also have a Minn Kota Endura C2 30 electric trolling motor for my small boat which needs a battery. My previous experience with a large lead ...
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1answer
64 views

How do I shop for an efficient low-current buck-boost converter?

I'm working on a low-power battery-powered application running at 3.3V; it needs a DC-DC converter to efficiently draw power from a range of possible battery combinations connected by the end user. In ...
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57 views

DIY Bluetooth speaker circuit won't turn on

I'm making a Bluetooth speaker and made a schematic which I'm using to follow to build the speaker. It's loosely based on this DIY video I saw online, here's the picture of the relevant parts I ...
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1answer
91 views

Should I use an isolated DC-DC converter?

I am designing a controller pcb for a wall climbing robot, which uses a ~150W suction brushless motor to stick to the walls and two smaller ~30W brushless motors to move around. The system consists of ...
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Series resistor on VFB of LTC3652 solar charger

I use a LTC3652 solar charger from a given schematic for a solar powered microcontroller board and I want to understand the circuit a little bit more. So why do they connect a resistor (...
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57 views

Is there something called as inrush current at the output of the DC-DC regulator or LDO

I am using this LDO to step down from 14V to 5V with a maximum output load current of 150mA. The above is the schematic of my LDO. I want to measure the inrush current of the LDO. But since I have an ...
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64 views

Where does the negative inductor current go during CCM at no load in synchronous converters?

As you all know, there are two primary mode of operation for dc-dc converters : CCM and DCM. At no load, the inductor current stops at zero at DCM. However, if CCM is enforced (such as Forced PWM), ...
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31 views

USB-3 Type A Connector Current Drain

I have a USB 3 Type A (i.e. 9pin connector) connector on my PC and connected to a USB 3 Type A connector on my PCB with a USB 3.0 Cable. This USB3 A Type connector on my PCB is connected to FT232H ...
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53 views

Shorting the Output of a voltage regulator

I am using this Buck Converter Input Voltage Range - 8-16V Output Voltage - 5V Load Current - 550mA This 5V is the power supply (Vcc) to the mentioned IC loads : Microcontroller , LED Driver , 2x CAN ...
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35 views

IC datasheet and MOSFET selection question

I am trying to design a buck converter using TI's LM3150 synchronous buck controller and I am wondering how to read some of these specs and how to select MOSFETs based on gate charge: https://www.ti....
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817 views

Where does the inductor energy go in a buck converter when the load is suddenly disconnected?

It is known that inductors resist a change in current. So, my question is that in a buck converter, what prevents the output voltage from going all the way up due to inductor resisting a current ...
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120 views

How can I prevent my DC-DC converters from exploding?

I'm an electrical engineering student at TAMU working on a project for my first internship: a signal recorder for an experimental helicopter. For context, here are some of my requirements: 19 DC ...
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90 views

Powering two 19v devices from a single 12V to 19V converter

I am building a laptop charger to run off of a 12V source (lithium batteries in a camper). Initially, I was just going to replicate this article to make a 12V MagSafe 2 charger for my MacBook Pro (up ...
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Will adding a DC-DC converter affect how a modern car operates?

I'm thinking of adding a wireless charger to my car, and adding a Buck Converter to step down the 12V source to 5V for efficiency sake. However, I am worried about the emissions from the DC-DC ...
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MOSFET Selection based on peak drain current

While selecting a MOSFET for application how do we calculate the peak currents which can occur in the circuit? I am designing a DC/DC interleaved synchronous Buck Converter (2 MOSFETS per rail) for ...
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68 views

Maximum Power Point Tracker (MPPT) charge controller - what drives the weight?

I'm having trouble finding any literature paper that studies this problem. What drives the weight of an MPPT charge controller? How would I go about reducing that weight if I had to design a custom ...
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43 views

DC-DC Boost Converter Only Works with a Second Supply

I'm trying to build a 5V to 8V boost converter to use at another mosfet's gate voltage. I'm using a PIC mcu to create a 50kHz square wave signal to switch the BUZ101L. For test purposes i also added a ...
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45 views

Power System Design for BLDC control - why not use a DC/DC convertor?

So I have experienced the usage of a BLDC motor to spin a propeller. The electrical design ensured the bus voltage was such as to bring the motor to a good operating regime given the Kv, etc. However, ...
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77 views

Drop input voltage for a boost converter

I have a 21V DC solar panel power source, that feeds a DC-DC boost converter. I set the output voltage of the boost converter to 19.5V to charge my laptop, but since the input voltage is higher than ...
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47 views

Connect a DC/DC converter to a virtual precision ground in KiCad

I'm trying to design a circuit which steps up 5V to 12V using a DC/DC converter and then use a virtual precision ground TLE2426 to split the 12v to +/-6V. I'm using this design in KiCad: I'm having ...

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