Questions tagged [boost]

A non-isolated DC/DC converter topology.

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Boost IC input voltage and output voltage query

I'm planning to use TPS61099DRVR boost converter IC from TI part in my product. Can this boost converter works reliably when input voltage reaches close to output voltage set by feedback resistors? My ...
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89 views

TPS55340 boost circuit not making desired voltage

I've created a 12 VAC -> 24 VDC boost power supply based on the TPS55340 regulator. I used a reference design from TI's WEBENCH tool, with some selected part substitutions for parts availability, ...
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90 views

Simulation of boost converter using SiC MOSFET in LTspice

I am trying to simulate boost converter using SiC MOSFET (MOSFET MODEL = G2R1000MT17D). The boost converter specifications are: Vin = 200 V Vout = 400 V Fsw = 150 kHz When simulating the above ...
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Ultra low ripple symmetric +/-5V USB powered converter

I have a signal processing circuit that requires symmetrical +/-5V, about 0,5A each with a requirement that the output ripple should be as low as possible (ultra-low ripple.) I have tested various ...
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LC high-voltage high-frequency voltage booster theory question

I am kind of new in electronics so I would like to know if you could help me with this one please. I am trying to make a circuit that will create high voltage at high frequency. I am trying to ...
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69 views

Different power supply layouts for ICs with 3.3V and 5V

I'm currently studying different approaches to supplying a PCB which needs both 3.3V and 5V from a wide range DC input source (i.e., 6-36V.) The most common layout I've come across is V_in(6-36) -> ...
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122 views

How to drive a LED 120-126v 1500w from 230v (or 12/24v)? [closed]

I need to feed a LED with 120-126v 1500w, made of two strips, 750w each (the heat being generated over a surface of 8cm x 8cm). EDIT: This is for imaging purposes, so high CRI, is important. ...
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27 views

Boost converter switch current computation verification

I need to have a boost converter in my design in order to provide 5V to the entire system. According to all datasheets I could gather, the total current of the board should not be above 1.5A. So, the ...
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22 views

Boost with inverter, second harmonic current

I have a boost converter followed by an inverter to supply a load. The output frequency of the inverter is variable but relatively low (~50 Hz). The issue I'm facing is the second harmonic current (at ...
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33 views

Battery Charging (MCP73871) and Boosting (TPS61032 ) to 5V

I am using MCP73871 charging IC to charge 3.7 Li-Ion battery. This IC can take either input from charger or from battery and generate the output accordingly. TPS61032 is used to boost the output from ...
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LED driver/analog adjustable constant current source with constant output without PWM switching?

I am using 3 halogen lights with 5V/0.5A each controlled by a constant current source (or basically "LED driver") because of light accuracy. Right now I am using the PT4115 (step down led ...
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63 views

Which resistor should I add in place of potentiometer in XL6009 boost converter module to increase 3.7 V to 12 V? [closed]

I'm using 18650 batteries with XL6009 boost converter module to increase 3.7 V to 12 V. There is a potentiometer to control the output voltage in boost converter. But can we fix the output voltage to ...
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73 views

Why should the fullwave current sensor bandwith be about 10 times switching frequency?

This is an example of high side switch current sensor in a buck-boost converter. I read that for high-side switch full waveform sensing the current sensor bandwith should be about 10 times switching ...
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66 views

Help understanding use of step-up boost converter

I have a Ryobi battery that I'd like to charge from 12V instead of 230V. The charger comes with a power supply that outputs 36V 1.7A. So I thought I could easily replace this with at step-up boost ...
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77 views

Why the output voltage of no-load boost converter is increase continuously?

I'm designing the boost converter with 3 mH inductor and 680 uF capacitor 20 kHz fequency. When I try with 12 V, 5 A power supply in the input and fixed 50% duty cycle, I can reach the 24 V output ...
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66 views

How to use a battery charger evaluation module as a booster?

I have a power source that can give me around 0.9 ~ 1 V and 900uA. I would like to use the BQ25570 battery charger evaluation module to give an output of 1.8 V. I would like to attach a capacitor to ...
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Debug a LT3759 boost converter

I wanted to make a 3V - 4.2V in to 5V/2A out boost converter. I kind of copied the schematic of an example board on digikey. I developped 2 pcb using this schematic (both have same connections/layout/...
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88 views

Analysis of DC-DC converter with bidirectional power flow

Let's assume that Vin is a DC battery and Vout is a spacecraft main power bus. It is given that this circuit is DC-DC converter with bidirectional power flow. But to me this circuit exactly looks like ...
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INJOINIC IP5209T Charging Circuit Troubleshooting

I have put together a PCB design that uses an INJOINIC IP5209T charging IC as a 3.7V LiPo charger and 5V boost output. I have assembled the PCB but it does not seem to be working properly. Problem 1 ...
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72 views

Is a run-time adjustable boost converter possible?

I have a power supply that ranges from 12V-30V. I want to power a set of 4 (24V, 1A) solenoids in series. I also want to use a reduced hold current. So, I'm looking for an output of 96V for a time (~...
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What filters the output voltage in those switching regulators (boost and buck-boost) which don't have a direct LC filter?

In a buck converter, the LC filter sees a pulsating voltage at its input, and the output is an almost DC voltage. However in other non-isolated converter topologies where the inductor is not connected ...
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53 views

Grounding problem is coming between boost converter and MOSFET driver

I am designing a boost converter which is rated on 100 watts, 12 volt to 24 volt, switching frequency is 20 kHz, in open-loop conditions. When I give the input power supply to the circuit as 12 volt, ...
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45 views

Boost converter Ic extremely heats up when trying to switch using Mosfet

In Case 1, the converter works fine but in the other case it heats up extremely. Tried same using a PNP nosfet and it heats up the same as soon as load is connected. 12v 1A router is used as a load ...
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39 views

Trying to Dampen a Boosted LC Circuit

I am currently implementing the circuit shown below where the first stage is a boost converter and the second stage (output stage) is an LC circuit with a boost topology. The goal is to take a 24V DC ...
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32 views

Legacy battery system - series connection or boost circuit

Background. I have a legacy battery system that is comprised of twenty-four 12V Li-ion battery modules (self-protected), enclosed in a shell with the charging connection provided as a common ground ...
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61 views

Do boost converters change common ground?

I am working on a project which requires the use of a boost converter to power a sensor which is read by a microcontroller. Both are powered from a battery. I know that when reading signals from a ...
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1answer
75 views

Boost converter drive inductor into saturation

The boost converter I'm trying to put together might seem a little bit odd, as it's made out of parts that belong in a museum, but I've quite a lot of them so I thought to use them for something. I ...
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3answers
68 views

Current Feedback/Sense Circuit

I am trying to understand the circuit from this datasheet so I can use it in a project. The issue I am having is how the current feedback works (circled below). OUT_IFB is the current feedback for the ...
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4answers
89 views

20dB/decade vs 6dB per octave - Loop Stability

I am reading about the control loop stability of the DC-DC Converters. And I read this criteria that the slope of the gain curve at 0dB (unity gain) should be 20dB/decade. But they don't tell why. ...
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77 views

Using boost converter and battery to power Peltier device

I designed a boost converter using a 555 timer in order to power a Peltier device. This is mostly just for fun and to understand circuits a bit better. I ordered all the parts so that they are the ...
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Charging lead-acid batteries via a boost converter. Are my calculations right?

I want to charge my two lead-acid batteries connected in series to a stair-case lift. I do not have a proper charger (don't have ebay/amazon here) but I do have a 19V, 3A laptop charger (SMPS). I also ...
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46 views

Buck converter output LC filter phase difference

I was going through a few buck converter questions in this forum to understand deeply about the circuit and I found this question. However, I am not focused too much on the ripple right now. But when ...
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109 views

What causes harmonics in DC-DC Switching converters like Buck and Boost Converter

Can someone tell me what and how the harmonics are caused in the DC-DC Switching converters? I tried to read this, but I am not understanding. Can someone please explain in simple terms
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1answer
34 views

Buck Converter Voltage waveform at the free wheeling diode cathode and anode

I am trying to understand the voltages at the free wheeling diode's cathode and anode in a buck converter. During the ON-state (as in the above circuit diagram), I assume the voltage at the diode's ...
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2answers
60 views

Homemade solar charger with boost buck converter, voltage drops to 0 if I draw more than 10% of rated power

So I'm trying to build a mobile solar charger for camping, mainly for cellphone and some 18650s for my electric cigarette. I'm using: Should Draw max 36W for 2 Fast charging devices, I can't find a ...
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38 views

Finding the Gain Equation of a Boost Converter with LC Resonator

I am trying to implement the following datasheet circuit in a project. The circuit is a boost converter with an LC circuit resonator (L3 and C4 resonate). I am trying to find the DC transfer function ...
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81 views

What circuit is most efficient to boost 1.5V AA to 9V

While it’s impractical in real-world designs, is it possible to take a 1.5V AA battery and use some sort of circuit to boost to roughly 9V with around 10mA max output? There are so few chips that ...
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1answer
60 views

TPS61023 not regulating output when VIN > VO

I'm using TPS61023 + BQ24075 in a power management circuit so that when a USB cable is plugged in the system will charge a LiPo battery while still powering the system with 3.3V. When the USB cable is ...
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67 views

Design of DC-DC Converters

While designing buck converters (or boost converters), why do we usually fix some percentage of the Ripple current (or ripple voltage) and from this percentage, we arrive at the value of inductor and ...
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2answers
74 views

Is there a thumb rule for the input and output capacitor for DC-DC converters?

If we are using a buck converter of say 5V 1A output, we definitely require input and output capacitors. Just without making any calculations, is there a thumb rule on what the values of the input and ...
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1answer
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Design problem with current mode boost converter with the PAM2423 comp?

I'm trying to a boost conveter PAM2423 which workd at 520kHz for the first time(using a high quality breadboard from jameco for prototyping) following the manufacturer ref schematic: My Setup: I've ...
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1answer
91 views

Boost Converter/ Inverting Converter Noise Measurement

I built a boost/inverting converter using TPS65130. The output voltage is +15V and - 15V. Below is a picture of the schematics: I know the schematics shows a zener diode symbol, but that's just a ...
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1answer
65 views

How to use 18650 instead of A23 battery to power 12V door/window sensor

I have a security/alarm system running, it uses multiple door/window sensors (433Mhz), which use A23 12V batteries. These A23 battery are non-rechargeable and quite low on capacity (used in 433Mhz ...
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162 views

Buck Converter - Output Voltage Ripple

I just would like to ask about the small-ripple approximation and output ripple of buck/boost converters: I understand that in a buck converter, there is an LC filter at the output. If correctly ...
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Buck boost inverter design with current mode

As a project, I should design inverting buck boost converter without using IC. I designed somehow the converter but not optimized it yet since I have no proper drive. I am planning to set output of ...
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72 views

Monitoring a LiPo battery while powering the Arduino

Well I am tring to make a circuit to charging lipo battery then use lipo. while arduino nano using lipo battery, nano measuring the voltage level of lipo. I am planning to make deep sleep if voltage ...
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4answers
143 views

Limiting the Inrush current of the Boost converter device?

I have a source of 24V and I cannot draw more than 2.4W from the same. This means I cannot draw a current more than 100mA from this supply. Alongside boost converter, it also has some other circuits ...
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66 views

Designing an LC output filter for a DC-DC Boost high power system (2 MW)

I am currently designing a dc-dc boost high power system. The input voltage is boosted from 1 kV to 1.2 kV. The rated power is 2 MW and the switching frequency is 2 kHz. Due to the boost concept of ...
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1answer
113 views

Buck and boost converter in series

I have a project where I'm looking to power a ESP32 module with 3.3 V and a logic level shifter with 5.1 V. The project will be powered by between 5 and 24 V. So my plan is to have a buck converter ...
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1answer
38 views

Which Power Management Topology

This is a bit of an open question but I am seeking advice on further research and also some search terms so I can find the best solution. The project requires a 48V source from a battery pack which ...

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